blob: 989685098b3ea7d62f251bd3b1ac39de7e2391c6 [file] [log] [blame]
#define pr_fmt(fmt) "SVM: " fmt
#include <linux/kvm_host.h>
#include "irq.h"
#include "mmu.h"
#include "kvm_cache_regs.h"
#include "x86.h"
#include "cpuid.h"
#include "pmu.h"
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/amd-iommu.h>
#include <linux/sched.h>
#include <linux/trace_events.h>
#include <linux/slab.h>
#include <linux/hashtable.h>
#include <linux/objtool.h>
#include <linux/psp-sev.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/rwsem.h>
#include <asm/apic.h>
#include <asm/perf_event.h>
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/debugreg.h>
#include <asm/kvm_para.h>
#include <asm/irq_remapping.h>
#include <asm/spec-ctrl.h>
#include <asm/cpu_device_id.h>
#include <asm/traps.h>
#include <asm/virtext.h>
#include "trace.h"
#include "svm.h"
#include "svm_ops.h"
#include "kvm_onhyperv.h"
#include "svm_onhyperv.h"
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
#ifdef MODULE
static const struct x86_cpu_id svm_cpu_id[] = {
X86_MATCH_FEATURE(X86_FEATURE_SVM, NULL),
{}
};
MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
#endif
#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3
#define SVM_FEATURE_LBRV (1 << 1)
#define SVM_FEATURE_SVML (1 << 2)
#define SVM_FEATURE_TSC_RATE (1 << 4)
#define SVM_FEATURE_VMCB_CLEAN (1 << 5)
#define SVM_FEATURE_FLUSH_ASID (1 << 6)
#define SVM_FEATURE_DECODE_ASSIST (1 << 7)
#define SVM_FEATURE_PAUSE_FILTER (1 << 10)
#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
#define TSC_RATIO_RSVD 0xffffff0000000000ULL
#define TSC_RATIO_MIN 0x0000000000000001ULL
#define TSC_RATIO_MAX 0x000000ffffffffffULL
static bool erratum_383_found __read_mostly;
u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
/*
* Set osvw_len to higher value when updated Revision Guides
* are published and we know what the new status bits are
*/
static uint64_t osvw_len = 4, osvw_status;
static DEFINE_PER_CPU(u64, current_tsc_ratio);
#define TSC_RATIO_DEFAULT 0x0100000000ULL
static const struct svm_direct_access_msrs {
u32 index; /* Index of the MSR */
bool always; /* True if intercept is initially cleared */
} direct_access_msrs[MAX_DIRECT_ACCESS_MSRS] = {
{ .index = MSR_STAR, .always = true },
{ .index = MSR_IA32_SYSENTER_CS, .always = true },
{ .index = MSR_IA32_SYSENTER_EIP, .always = false },
{ .index = MSR_IA32_SYSENTER_ESP, .always = false },
#ifdef CONFIG_X86_64
{ .index = MSR_GS_BASE, .always = true },
{ .index = MSR_FS_BASE, .always = true },
{ .index = MSR_KERNEL_GS_BASE, .always = true },
{ .index = MSR_LSTAR, .always = true },
{ .index = MSR_CSTAR, .always = true },
{ .index = MSR_SYSCALL_MASK, .always = true },
#endif
{ .index = MSR_IA32_SPEC_CTRL, .always = false },
{ .index = MSR_IA32_PRED_CMD, .always = false },
{ .index = MSR_IA32_LASTBRANCHFROMIP, .always = false },
{ .index = MSR_IA32_LASTBRANCHTOIP, .always = false },
{ .index = MSR_IA32_LASTINTFROMIP, .always = false },
{ .index = MSR_IA32_LASTINTTOIP, .always = false },
{ .index = MSR_EFER, .always = false },
{ .index = MSR_IA32_CR_PAT, .always = false },
{ .index = MSR_AMD64_SEV_ES_GHCB, .always = true },
{ .index = MSR_INVALID, .always = false },
};
/*
* These 2 parameters are used to config the controls for Pause-Loop Exiting:
* pause_filter_count: On processors that support Pause filtering(indicated
* by CPUID Fn8000_000A_EDX), the VMCB provides a 16 bit pause filter
* count value. On VMRUN this value is loaded into an internal counter.
* Each time a pause instruction is executed, this counter is decremented
* until it reaches zero at which time a #VMEXIT is generated if pause
* intercept is enabled. Refer to AMD APM Vol 2 Section 15.14.4 Pause
* Intercept Filtering for more details.
* This also indicate if ple logic enabled.
*
* pause_filter_thresh: In addition, some processor families support advanced
* pause filtering (indicated by CPUID Fn8000_000A_EDX) upper bound on
* the amount of time a guest is allowed to execute in a pause loop.
* In this mode, a 16-bit pause filter threshold field is added in the
* VMCB. The threshold value is a cycle count that is used to reset the
* pause counter. As with simple pause filtering, VMRUN loads the pause
* count value from VMCB into an internal counter. Then, on each pause
* instruction the hardware checks the elapsed number of cycles since
* the most recent pause instruction against the pause filter threshold.
* If the elapsed cycle count is greater than the pause filter threshold,
* then the internal pause count is reloaded from the VMCB and execution
* continues. If the elapsed cycle count is less than the pause filter
* threshold, then the internal pause count is decremented. If the count
* value is less than zero and PAUSE intercept is enabled, a #VMEXIT is
* triggered. If advanced pause filtering is supported and pause filter
* threshold field is set to zero, the filter will operate in the simpler,
* count only mode.
*/
static unsigned short pause_filter_thresh = KVM_DEFAULT_PLE_GAP;
module_param(pause_filter_thresh, ushort, 0444);
static unsigned short pause_filter_count = KVM_SVM_DEFAULT_PLE_WINDOW;
module_param(pause_filter_count, ushort, 0444);
/* Default doubles per-vcpu window every exit. */
static unsigned short pause_filter_count_grow = KVM_DEFAULT_PLE_WINDOW_GROW;
module_param(pause_filter_count_grow, ushort, 0444);
/* Default resets per-vcpu window every exit to pause_filter_count. */
static unsigned short pause_filter_count_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK;
module_param(pause_filter_count_shrink, ushort, 0444);
/* Default is to compute the maximum so we can never overflow. */
static unsigned short pause_filter_count_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX;
module_param(pause_filter_count_max, ushort, 0444);
/*
* Use nested page tables by default. Note, NPT may get forced off by
* svm_hardware_setup() if it's unsupported by hardware or the host kernel.
*/
bool npt_enabled = true;
module_param_named(npt, npt_enabled, bool, 0444);
/* allow nested virtualization in KVM/SVM */
static int nested = true;
module_param(nested, int, S_IRUGO);
/* enable/disable Next RIP Save */
static int nrips = true;
module_param(nrips, int, 0444);
/* enable/disable Virtual VMLOAD VMSAVE */
static int vls = true;
module_param(vls, int, 0444);
/* enable/disable Virtual GIF */
static int vgif = true;
module_param(vgif, int, 0444);
/*
* enable / disable AVIC. Because the defaults differ for APICv
* support between VMX and SVM we cannot use module_param_named.
*/
static bool avic;
module_param(avic, bool, 0444);
bool __read_mostly dump_invalid_vmcb;
module_param(dump_invalid_vmcb, bool, 0644);
bool intercept_smi = true;
module_param(intercept_smi, bool, 0444);
static bool svm_gp_erratum_intercept = true;
static u8 rsm_ins_bytes[] = "\x0f\xaa";
static unsigned long iopm_base;
struct kvm_ldttss_desc {
u16 limit0;
u16 base0;
unsigned base1:8, type:5, dpl:2, p:1;
unsigned limit1:4, zero0:3, g:1, base2:8;
u32 base3;
u32 zero1;
} __attribute__((packed));
DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
/*
* Only MSR_TSC_AUX is switched via the user return hook. EFER is switched via
* the VMCB, and the SYSCALL/SYSENTER MSRs are handled by VMLOAD/VMSAVE.
*
* RDTSCP and RDPID are not used in the kernel, specifically to allow KVM to
* defer the restoration of TSC_AUX until the CPU returns to userspace.
*/
static int tsc_aux_uret_slot __read_mostly = -1;
static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
#define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
#define MSRS_RANGE_SIZE 2048
#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
u32 svm_msrpm_offset(u32 msr)
{
u32 offset;
int i;
for (i = 0; i < NUM_MSR_MAPS; i++) {
if (msr < msrpm_ranges[i] ||
msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
continue;
offset = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
offset += (i * MSRS_RANGE_SIZE); /* add range offset */
/* Now we have the u8 offset - but need the u32 offset */
return offset / 4;
}
/* MSR not in any range */
return MSR_INVALID;
}
#define MAX_INST_SIZE 15
static int get_max_npt_level(void)
{
#ifdef CONFIG_X86_64
return pgtable_l5_enabled() ? PT64_ROOT_5LEVEL : PT64_ROOT_4LEVEL;
#else
return PT32E_ROOT_LEVEL;
#endif
}
int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 old_efer = vcpu->arch.efer;
vcpu->arch.efer = efer;
if (!npt_enabled) {
/* Shadow paging assumes NX to be available. */
efer |= EFER_NX;
if (!(efer & EFER_LMA))
efer &= ~EFER_LME;
}
if ((old_efer & EFER_SVME) != (efer & EFER_SVME)) {
if (!(efer & EFER_SVME)) {
svm_leave_nested(svm);
svm_set_gif(svm, true);
/* #GP intercept is still needed for vmware backdoor */
if (!enable_vmware_backdoor)
clr_exception_intercept(svm, GP_VECTOR);
/*
* Free the nested guest state, unless we are in SMM.
* In this case we will return to the nested guest
* as soon as we leave SMM.
*/
if (!is_smm(vcpu))
svm_free_nested(svm);
} else {
int ret = svm_allocate_nested(svm);
if (ret) {
vcpu->arch.efer = old_efer;
return ret;
}
if (svm_gp_erratum_intercept)
set_exception_intercept(svm, GP_VECTOR);
}
}
svm->vmcb->save.efer = efer | EFER_SVME;
vmcb_mark_dirty(svm->vmcb, VMCB_CR);
return 0;
}
static int is_external_interrupt(u32 info)
{
info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
}
static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u32 ret = 0;
if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
return ret;
}
static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (mask == 0)
svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
else
svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
}
static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
/*
* SEV-ES does not expose the next RIP. The RIP update is controlled by
* the type of exit and the #VC handler in the guest.
*/
if (sev_es_guest(vcpu->kvm))
goto done;
if (nrips && svm->vmcb->control.next_rip != 0) {
WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
svm->next_rip = svm->vmcb->control.next_rip;
}
if (!svm->next_rip) {
if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP))
return 0;
} else {
kvm_rip_write(vcpu, svm->next_rip);
}
done:
svm_set_interrupt_shadow(vcpu, 0);
return 1;
}
static void svm_queue_exception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
unsigned nr = vcpu->arch.exception.nr;
bool has_error_code = vcpu->arch.exception.has_error_code;
u32 error_code = vcpu->arch.exception.error_code;
kvm_deliver_exception_payload(vcpu);
if (nr == BP_VECTOR && !nrips) {
unsigned long rip, old_rip = kvm_rip_read(vcpu);
/*
* For guest debugging where we have to reinject #BP if some
* INT3 is guest-owned:
* Emulate nRIP by moving RIP forward. Will fail if injection
* raises a fault that is not intercepted. Still better than
* failing in all cases.
*/
(void)skip_emulated_instruction(vcpu);
rip = kvm_rip_read(vcpu);
svm->int3_rip = rip + svm->vmcb->save.cs.base;
svm->int3_injected = rip - old_rip;
}
svm->vmcb->control.event_inj = nr
| SVM_EVTINJ_VALID
| (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
| SVM_EVTINJ_TYPE_EXEPT;
svm->vmcb->control.event_inj_err = error_code;
}
static void svm_init_erratum_383(void)
{
u32 low, high;
int err;
u64 val;
if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
return;
/* Use _safe variants to not break nested virtualization */
val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
if (err)
return;
val |= (1ULL << 47);
low = lower_32_bits(val);
high = upper_32_bits(val);
native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);
erratum_383_found = true;
}
static void svm_init_osvw(struct kvm_vcpu *vcpu)
{
/*
* Guests should see errata 400 and 415 as fixed (assuming that
* HLT and IO instructions are intercepted).
*/
vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
vcpu->arch.osvw.status = osvw_status & ~(6ULL);
/*
* By increasing VCPU's osvw.length to 3 we are telling the guest that
* all osvw.status bits inside that length, including bit 0 (which is
* reserved for erratum 298), are valid. However, if host processor's
* osvw_len is 0 then osvw_status[0] carries no information. We need to
* be conservative here and therefore we tell the guest that erratum 298
* is present (because we really don't know).
*/
if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
vcpu->arch.osvw.status |= 1;
}
static int has_svm(void)
{
const char *msg;
if (!cpu_has_svm(&msg)) {
printk(KERN_INFO "has_svm: %s\n", msg);
return 0;
}
if (sev_active()) {
pr_info("KVM is unsupported when running as an SEV guest\n");
return 0;
}
return 1;
}
static void svm_hardware_disable(void)
{
/* Make sure we clean up behind us */
if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
cpu_svm_disable();
amd_pmu_disable_virt();
}
static int svm_hardware_enable(void)
{
struct svm_cpu_data *sd;
uint64_t efer;
struct desc_struct *gdt;
int me = raw_smp_processor_id();
rdmsrl(MSR_EFER, efer);
if (efer & EFER_SVME)
return -EBUSY;
if (!has_svm()) {
pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
return -EINVAL;
}
sd = per_cpu(svm_data, me);
if (!sd) {
pr_err("%s: svm_data is NULL on %d\n", __func__, me);
return -EINVAL;
}
sd->asid_generation = 1;
sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
sd->next_asid = sd->max_asid + 1;
sd->min_asid = max_sev_asid + 1;
gdt = get_current_gdt_rw();
sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
wrmsrl(MSR_EFER, efer | EFER_SVME);
wrmsrl(MSR_VM_HSAVE_PA, __sme_page_pa(sd->save_area));
if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
}
/*
* Get OSVW bits.
*
* Note that it is possible to have a system with mixed processor
* revisions and therefore different OSVW bits. If bits are not the same
* on different processors then choose the worst case (i.e. if erratum
* is present on one processor and not on another then assume that the
* erratum is present everywhere).
*/
if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) {
uint64_t len, status = 0;
int err;
len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err);
if (!err)
status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS,
&err);
if (err)
osvw_status = osvw_len = 0;
else {
if (len < osvw_len)
osvw_len = len;
osvw_status |= status;
osvw_status &= (1ULL << osvw_len) - 1;
}
} else
osvw_status = osvw_len = 0;
svm_init_erratum_383();
amd_pmu_enable_virt();
return 0;
}
static void svm_cpu_uninit(int cpu)
{
struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
if (!sd)
return;
per_cpu(svm_data, cpu) = NULL;
kfree(sd->sev_vmcbs);
__free_page(sd->save_area);
kfree(sd);
}
static int svm_cpu_init(int cpu)
{
struct svm_cpu_data *sd;
int ret = -ENOMEM;
sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
if (!sd)
return ret;
sd->cpu = cpu;
sd->save_area = alloc_page(GFP_KERNEL);
if (!sd->save_area)
goto free_cpu_data;
clear_page(page_address(sd->save_area));
ret = sev_cpu_init(sd);
if (ret)
goto free_save_area;
per_cpu(svm_data, cpu) = sd;
return 0;
free_save_area:
__free_page(sd->save_area);
free_cpu_data:
kfree(sd);
return ret;
}
static int direct_access_msr_slot(u32 msr)
{
u32 i;
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
if (direct_access_msrs[i].index == msr)
return i;
return -ENOENT;
}
static void set_shadow_msr_intercept(struct kvm_vcpu *vcpu, u32 msr, int read,
int write)
{
struct vcpu_svm *svm = to_svm(vcpu);
int slot = direct_access_msr_slot(msr);
if (slot == -ENOENT)
return;
/* Set the shadow bitmaps to the desired intercept states */
if (read)
set_bit(slot, svm->shadow_msr_intercept.read);
else
clear_bit(slot, svm->shadow_msr_intercept.read);
if (write)
set_bit(slot, svm->shadow_msr_intercept.write);
else
clear_bit(slot, svm->shadow_msr_intercept.write);
}
static bool valid_msr_intercept(u32 index)
{
return direct_access_msr_slot(index) != -ENOENT;
}
static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr)
{
u8 bit_write;
unsigned long tmp;
u32 offset;
u32 *msrpm;
msrpm = is_guest_mode(vcpu) ? to_svm(vcpu)->nested.msrpm:
to_svm(vcpu)->msrpm;
offset = svm_msrpm_offset(msr);
bit_write = 2 * (msr & 0x0f) + 1;
tmp = msrpm[offset];
BUG_ON(offset == MSR_INVALID);
return !!test_bit(bit_write, &tmp);
}
static void set_msr_interception_bitmap(struct kvm_vcpu *vcpu, u32 *msrpm,
u32 msr, int read, int write)
{
u8 bit_read, bit_write;
unsigned long tmp;
u32 offset;
/*
* If this warning triggers extend the direct_access_msrs list at the
* beginning of the file
*/
WARN_ON(!valid_msr_intercept(msr));
/* Enforce non allowed MSRs to trap */
if (read && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_READ))
read = 0;
if (write && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_WRITE))
write = 0;
offset = svm_msrpm_offset(msr);
bit_read = 2 * (msr & 0x0f);
bit_write = 2 * (msr & 0x0f) + 1;
tmp = msrpm[offset];
BUG_ON(offset == MSR_INVALID);
read ? clear_bit(bit_read, &tmp) : set_bit(bit_read, &tmp);
write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
msrpm[offset] = tmp;
svm_hv_vmcb_dirty_nested_enlightenments(vcpu);
}
void set_msr_interception(struct kvm_vcpu *vcpu, u32 *msrpm, u32 msr,
int read, int write)
{
set_shadow_msr_intercept(vcpu, msr, read, write);
set_msr_interception_bitmap(vcpu, msrpm, msr, read, write);
}
u32 *svm_vcpu_alloc_msrpm(void)
{
unsigned int order = get_order(MSRPM_SIZE);
struct page *pages = alloc_pages(GFP_KERNEL_ACCOUNT, order);
u32 *msrpm;
if (!pages)
return NULL;
msrpm = page_address(pages);
memset(msrpm, 0xff, PAGE_SIZE * (1 << order));
return msrpm;
}
void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm)
{
int i;
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
if (!direct_access_msrs[i].always)
continue;
set_msr_interception(vcpu, msrpm, direct_access_msrs[i].index, 1, 1);
}
}
void svm_vcpu_free_msrpm(u32 *msrpm)
{
__free_pages(virt_to_page(msrpm), get_order(MSRPM_SIZE));
}
static void svm_msr_filter_changed(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u32 i;
/*
* Set intercept permissions for all direct access MSRs again. They
* will automatically get filtered through the MSR filter, so we are
* back in sync after this.
*/
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
u32 msr = direct_access_msrs[i].index;
u32 read = test_bit(i, svm->shadow_msr_intercept.read);
u32 write = test_bit(i, svm->shadow_msr_intercept.write);
set_msr_interception_bitmap(vcpu, svm->msrpm, msr, read, write);
}
}
static void add_msr_offset(u32 offset)
{
int i;
for (i = 0; i < MSRPM_OFFSETS; ++i) {
/* Offset already in list? */
if (msrpm_offsets[i] == offset)
return;
/* Slot used by another offset? */
if (msrpm_offsets[i] != MSR_INVALID)
continue;
/* Add offset to list */
msrpm_offsets[i] = offset;
return;
}
/*
* If this BUG triggers the msrpm_offsets table has an overflow. Just
* increase MSRPM_OFFSETS in this case.
*/
BUG();
}
static void init_msrpm_offsets(void)
{
int i;
memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
u32 offset;
offset = svm_msrpm_offset(direct_access_msrs[i].index);
BUG_ON(offset == MSR_INVALID);
add_msr_offset(offset);
}
}
static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
}
static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
}
void disable_nmi_singlestep(struct vcpu_svm *svm)
{
svm->nmi_singlestep = false;
if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) {
/* Clear our flags if they were not set by the guest */
if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
svm->vmcb->save.rflags &= ~X86_EFLAGS_TF;
if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
svm->vmcb->save.rflags &= ~X86_EFLAGS_RF;
}
}
static void grow_ple_window(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_control_area *control = &svm->vmcb->control;
int old = control->pause_filter_count;
control->pause_filter_count = __grow_ple_window(old,
pause_filter_count,
pause_filter_count_grow,
pause_filter_count_max);
if (control->pause_filter_count != old) {
vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
trace_kvm_ple_window_update(vcpu->vcpu_id,
control->pause_filter_count, old);
}
}
static void shrink_ple_window(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_control_area *control = &svm->vmcb->control;
int old = control->pause_filter_count;
control->pause_filter_count =
__shrink_ple_window(old,
pause_filter_count,
pause_filter_count_shrink,
pause_filter_count);
if (control->pause_filter_count != old) {
vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
trace_kvm_ple_window_update(vcpu->vcpu_id,
control->pause_filter_count, old);
}
}
/*
* The default MMIO mask is a single bit (excluding the present bit),
* which could conflict with the memory encryption bit. Check for
* memory encryption support and override the default MMIO mask if
* memory encryption is enabled.
*/
static __init void svm_adjust_mmio_mask(void)
{
unsigned int enc_bit, mask_bit;
u64 msr, mask;
/* If there is no memory encryption support, use existing mask */
if (cpuid_eax(0x80000000) < 0x8000001f)
return;
/* If memory encryption is not enabled, use existing mask */
rdmsrl(MSR_AMD64_SYSCFG, msr);
if (!(msr & MSR_AMD64_SYSCFG_MEM_ENCRYPT))
return;
enc_bit = cpuid_ebx(0x8000001f) & 0x3f;
mask_bit = boot_cpu_data.x86_phys_bits;
/* Increment the mask bit if it is the same as the encryption bit */
if (enc_bit == mask_bit)
mask_bit++;
/*
* If the mask bit location is below 52, then some bits above the
* physical addressing limit will always be reserved, so use the
* rsvd_bits() function to generate the mask. This mask, along with
* the present bit, will be used to generate a page fault with
* PFER.RSV = 1.
*
* If the mask bit location is 52 (or above), then clear the mask.
*/
mask = (mask_bit < 52) ? rsvd_bits(mask_bit, 51) | PT_PRESENT_MASK : 0;
kvm_mmu_set_mmio_spte_mask(mask, mask, PT_WRITABLE_MASK | PT_USER_MASK);
}
static void svm_hardware_teardown(void)
{
int cpu;
sev_hardware_teardown();
for_each_possible_cpu(cpu)
svm_cpu_uninit(cpu);
__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT),
get_order(IOPM_SIZE));
iopm_base = 0;
}
static __init void svm_set_cpu_caps(void)
{
kvm_set_cpu_caps();
supported_xss = 0;
/* CPUID 0x80000001 and 0x8000000A (SVM features) */
if (nested) {
kvm_cpu_cap_set(X86_FEATURE_SVM);
if (nrips)
kvm_cpu_cap_set(X86_FEATURE_NRIPS);
if (npt_enabled)
kvm_cpu_cap_set(X86_FEATURE_NPT);
/* Nested VM can receive #VMEXIT instead of triggering #GP */
kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK);
}
/* CPUID 0x80000008 */
if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
boot_cpu_has(X86_FEATURE_AMD_SSBD))
kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
/* CPUID 0x8000001F (SME/SEV features) */
sev_set_cpu_caps();
}
static __init int svm_hardware_setup(void)
{
int cpu;
struct page *iopm_pages;
void *iopm_va;
int r;
unsigned int order = get_order(IOPM_SIZE);
/*
* NX is required for shadow paging and for NPT if the NX huge pages
* mitigation is enabled.
*/
if (!boot_cpu_has(X86_FEATURE_NX)) {
pr_err_ratelimited("NX (Execute Disable) not supported\n");
return -EOPNOTSUPP;
}
kvm_enable_efer_bits(EFER_NX);
iopm_pages = alloc_pages(GFP_KERNEL, order);
if (!iopm_pages)
return -ENOMEM;
iopm_va = page_address(iopm_pages);
memset(iopm_va, 0xff, PAGE_SIZE * (1 << order));
iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
init_msrpm_offsets();
supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
kvm_enable_efer_bits(EFER_FFXSR);
if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
kvm_has_tsc_control = true;
kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
kvm_tsc_scaling_ratio_frac_bits = 32;
}
tsc_aux_uret_slot = kvm_add_user_return_msr(MSR_TSC_AUX);
/* Check for pause filtering support */
if (!boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
pause_filter_count = 0;
pause_filter_thresh = 0;
} else if (!boot_cpu_has(X86_FEATURE_PFTHRESHOLD)) {
pause_filter_thresh = 0;
}
if (nested) {
printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
}
/*
* KVM's MMU doesn't support using 2-level paging for itself, and thus
* NPT isn't supported if the host is using 2-level paging since host
* CR4 is unchanged on VMRUN.
*/
if (!IS_ENABLED(CONFIG_X86_64) && !IS_ENABLED(CONFIG_X86_PAE))
npt_enabled = false;
if (!boot_cpu_has(X86_FEATURE_NPT))
npt_enabled = false;
/* Force VM NPT level equal to the host's max NPT level */
kvm_configure_mmu(npt_enabled, get_max_npt_level(),
get_max_npt_level(), PG_LEVEL_1G);
pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
/* Note, SEV setup consumes npt_enabled. */
sev_hardware_setup();
svm_hv_hardware_setup();
svm_adjust_mmio_mask();
for_each_possible_cpu(cpu) {
r = svm_cpu_init(cpu);
if (r)
goto err;
}
if (nrips) {
if (!boot_cpu_has(X86_FEATURE_NRIPS))
nrips = false;
}
enable_apicv = avic = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);
if (enable_apicv) {
pr_info("AVIC enabled\n");
amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
}
if (vls) {
if (!npt_enabled ||
!boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
!IS_ENABLED(CONFIG_X86_64)) {
vls = false;
} else {
pr_info("Virtual VMLOAD VMSAVE supported\n");
}
}
if (boot_cpu_has(X86_FEATURE_SVME_ADDR_CHK))
svm_gp_erratum_intercept = false;
if (vgif) {
if (!boot_cpu_has(X86_FEATURE_VGIF))
vgif = false;
else
pr_info("Virtual GIF supported\n");
}
svm_set_cpu_caps();
/*
* It seems that on AMD processors PTE's accessed bit is
* being set by the CPU hardware before the NPF vmexit.
* This is not expected behaviour and our tests fail because
* of it.
* A workaround here is to disable support for
* GUEST_MAXPHYADDR < HOST_MAXPHYADDR if NPT is enabled.
* In this case userspace can know if there is support using
* KVM_CAP_SMALLER_MAXPHYADDR extension and decide how to handle
* it
* If future AMD CPU models change the behaviour described above,
* this variable can be changed accordingly
*/
allow_smaller_maxphyaddr = !npt_enabled;
return 0;
err:
svm_hardware_teardown();
return r;
}
static void init_seg(struct vmcb_seg *seg)
{
seg->selector = 0;
seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
seg->limit = 0xffff;
seg->base = 0;
}
static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
{
seg->selector = 0;
seg->attrib = SVM_SELECTOR_P_MASK | type;
seg->limit = 0xffff;
seg->base = 0;
}
static u64 svm_get_l2_tsc_offset(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
return svm->nested.ctl.tsc_offset;
}
static u64 svm_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu)
{
return kvm_default_tsc_scaling_ratio;
}
static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb01.ptr->control.tsc_offset = vcpu->arch.l1_tsc_offset;
svm->vmcb->control.tsc_offset = offset;
vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
}
static void svm_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 multiplier)
{
wrmsrl(MSR_AMD64_TSC_RATIO, multiplier);
}
/* Evaluate instruction intercepts that depend on guest CPUID features. */
static void svm_recalc_instruction_intercepts(struct kvm_vcpu *vcpu,
struct vcpu_svm *svm)
{
/*
* Intercept INVPCID if shadow paging is enabled to sync/free shadow
* roots, or if INVPCID is disabled in the guest to inject #UD.
*/
if (kvm_cpu_cap_has(X86_FEATURE_INVPCID)) {
if (!npt_enabled ||
!guest_cpuid_has(&svm->vcpu, X86_FEATURE_INVPCID))
svm_set_intercept(svm, INTERCEPT_INVPCID);
else
svm_clr_intercept(svm, INTERCEPT_INVPCID);
}
if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP)) {
if (guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP))
svm_clr_intercept(svm, INTERCEPT_RDTSCP);
else
svm_set_intercept(svm, INTERCEPT_RDTSCP);
}
}
static void init_vmcb(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_control_area *control = &svm->vmcb->control;
struct vmcb_save_area *save = &svm->vmcb->save;
svm_set_intercept(svm, INTERCEPT_CR0_READ);
svm_set_intercept(svm, INTERCEPT_CR3_READ);
svm_set_intercept(svm, INTERCEPT_CR4_READ);
svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
svm_set_intercept(svm, INTERCEPT_CR3_WRITE);
svm_set_intercept(svm, INTERCEPT_CR4_WRITE);
if (!kvm_vcpu_apicv_active(vcpu))
svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
set_dr_intercepts(svm);
set_exception_intercept(svm, PF_VECTOR);
set_exception_intercept(svm, UD_VECTOR);
set_exception_intercept(svm, MC_VECTOR);
set_exception_intercept(svm, AC_VECTOR);
set_exception_intercept(svm, DB_VECTOR);
/*
* Guest access to VMware backdoor ports could legitimately
* trigger #GP because of TSS I/O permission bitmap.
* We intercept those #GP and allow access to them anyway
* as VMware does.
*/
if (enable_vmware_backdoor)
set_exception_intercept(svm, GP_VECTOR);
svm_set_intercept(svm, INTERCEPT_INTR);
svm_set_intercept(svm, INTERCEPT_NMI);
if (intercept_smi)
svm_set_intercept(svm, INTERCEPT_SMI);
svm_set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
svm_set_intercept(svm, INTERCEPT_RDPMC);
svm_set_intercept(svm, INTERCEPT_CPUID);
svm_set_intercept(svm, INTERCEPT_INVD);
svm_set_intercept(svm, INTERCEPT_INVLPG);
svm_set_intercept(svm, INTERCEPT_INVLPGA);
svm_set_intercept(svm, INTERCEPT_IOIO_PROT);
svm_set_intercept(svm, INTERCEPT_MSR_PROT);
svm_set_intercept(svm, INTERCEPT_TASK_SWITCH);
svm_set_intercept(svm, INTERCEPT_SHUTDOWN);
svm_set_intercept(svm, INTERCEPT_VMRUN);
svm_set_intercept(svm, INTERCEPT_VMMCALL);
svm_set_intercept(svm, INTERCEPT_VMLOAD);
svm_set_intercept(svm, INTERCEPT_VMSAVE);
svm_set_intercept(svm, INTERCEPT_STGI);
svm_set_intercept(svm, INTERCEPT_CLGI);
svm_set_intercept(svm, INTERCEPT_SKINIT);
svm_set_intercept(svm, INTERCEPT_WBINVD);
svm_set_intercept(svm, INTERCEPT_XSETBV);
svm_set_intercept(svm, INTERCEPT_RDPRU);
svm_set_intercept(svm, INTERCEPT_RSM);
if (!kvm_mwait_in_guest(vcpu->kvm)) {
svm_set_intercept(svm, INTERCEPT_MONITOR);
svm_set_intercept(svm, INTERCEPT_MWAIT);
}
if (!kvm_hlt_in_guest(vcpu->kvm))
svm_set_intercept(svm, INTERCEPT_HLT);
control->iopm_base_pa = __sme_set(iopm_base);
control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
control->int_ctl = V_INTR_MASKING_MASK;
init_seg(&save->es);
init_seg(&save->ss);
init_seg(&save->ds);
init_seg(&save->fs);
init_seg(&save->gs);
save->cs.selector = 0xf000;
save->cs.base = 0xffff0000;
/* Executable/Readable Code Segment */
save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
save->cs.limit = 0xffff;
save->gdtr.base = 0;
save->gdtr.limit = 0xffff;
save->idtr.base = 0;
save->idtr.limit = 0xffff;
init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
if (npt_enabled) {
/* Setup VMCB for Nested Paging */
control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
svm_clr_intercept(svm, INTERCEPT_INVLPG);
clr_exception_intercept(svm, PF_VECTOR);
svm_clr_intercept(svm, INTERCEPT_CR3_READ);
svm_clr_intercept(svm, INTERCEPT_CR3_WRITE);
save->g_pat = vcpu->arch.pat;
save->cr3 = 0;
}
svm->current_vmcb->asid_generation = 0;
svm->asid = 0;
svm->nested.vmcb12_gpa = INVALID_GPA;
svm->nested.last_vmcb12_gpa = INVALID_GPA;
if (!kvm_pause_in_guest(vcpu->kvm)) {
control->pause_filter_count = pause_filter_count;
if (pause_filter_thresh)
control->pause_filter_thresh = pause_filter_thresh;
svm_set_intercept(svm, INTERCEPT_PAUSE);
} else {
svm_clr_intercept(svm, INTERCEPT_PAUSE);
}
svm_recalc_instruction_intercepts(vcpu, svm);
/*
* If the host supports V_SPEC_CTRL then disable the interception
* of MSR_IA32_SPEC_CTRL.
*/
if (boot_cpu_has(X86_FEATURE_V_SPEC_CTRL))
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
if (kvm_vcpu_apicv_active(vcpu))
avic_init_vmcb(svm);
if (vgif) {
svm_clr_intercept(svm, INTERCEPT_STGI);
svm_clr_intercept(svm, INTERCEPT_CLGI);
svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
}
if (sev_guest(vcpu->kvm)) {
svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
clr_exception_intercept(svm, UD_VECTOR);
if (sev_es_guest(vcpu->kvm)) {
/* Perform SEV-ES specific VMCB updates */
sev_es_init_vmcb(svm);
}
}
svm_hv_init_vmcb(svm->vmcb);
vmcb_mark_all_dirty(svm->vmcb);
enable_gif(svm);
}
static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->spec_ctrl = 0;
svm->virt_spec_ctrl = 0;
init_vmcb(vcpu);
}
void svm_switch_vmcb(struct vcpu_svm *svm, struct kvm_vmcb_info *target_vmcb)
{
svm->current_vmcb = target_vmcb;
svm->vmcb = target_vmcb->ptr;
}
static int svm_create_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm;
struct page *vmcb01_page;
struct page *vmsa_page = NULL;
int err;
BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
svm = to_svm(vcpu);
err = -ENOMEM;
vmcb01_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!vmcb01_page)
goto out;
if (sev_es_guest(vcpu->kvm)) {
/*
* SEV-ES guests require a separate VMSA page used to contain
* the encrypted register state of the guest.
*/
vmsa_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!vmsa_page)
goto error_free_vmcb_page;
/*
* SEV-ES guests maintain an encrypted version of their FPU
* state which is restored and saved on VMRUN and VMEXIT.
* Free the fpu structure to prevent KVM from attempting to
* access the FPU state.
*/
kvm_free_guest_fpu(vcpu);
}
err = avic_init_vcpu(svm);
if (err)
goto error_free_vmsa_page;
/* We initialize this flag to true to make sure that the is_running
* bit would be set the first time the vcpu is loaded.
*/
if (irqchip_in_kernel(vcpu->kvm) && kvm_apicv_activated(vcpu->kvm))
svm->avic_is_running = true;
svm->msrpm = svm_vcpu_alloc_msrpm();
if (!svm->msrpm) {
err = -ENOMEM;
goto error_free_vmsa_page;
}
svm->vmcb01.ptr = page_address(vmcb01_page);
svm->vmcb01.pa = __sme_set(page_to_pfn(vmcb01_page) << PAGE_SHIFT);
if (vmsa_page)
svm->vmsa = page_address(vmsa_page);
svm->guest_state_loaded = false;
svm_switch_vmcb(svm, &svm->vmcb01);
init_vmcb(vcpu);
svm_vcpu_init_msrpm(vcpu, svm->msrpm);
svm_init_osvw(vcpu);
vcpu->arch.microcode_version = 0x01000065;
if (sev_es_guest(vcpu->kvm))
/* Perform SEV-ES specific VMCB creation updates */
sev_es_create_vcpu(svm);
return 0;
error_free_vmsa_page:
if (vmsa_page)
__free_page(vmsa_page);
error_free_vmcb_page:
__free_page(vmcb01_page);
out:
return err;
}
static void svm_clear_current_vmcb(struct vmcb *vmcb)
{
int i;
for_each_online_cpu(i)
cmpxchg(&per_cpu(svm_data, i)->current_vmcb, vmcb, NULL);
}
static void svm_free_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
/*
* The vmcb page can be recycled, causing a false negative in
* svm_vcpu_load(). So, ensure that no logical CPU has this
* vmcb page recorded as its current vmcb.
*/
svm_clear_current_vmcb(svm->vmcb);
svm_free_nested(svm);
sev_free_vcpu(vcpu);
__free_page(pfn_to_page(__sme_clr(svm->vmcb01.pa) >> PAGE_SHIFT));
__free_pages(virt_to_page(svm->msrpm), get_order(MSRPM_SIZE));
}
static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu);
if (sev_es_guest(vcpu->kvm))
sev_es_unmap_ghcb(svm);
if (svm->guest_state_loaded)
return;
/*
* Save additional host state that will be restored on VMEXIT (sev-es)
* or subsequent vmload of host save area.
*/
if (sev_es_guest(vcpu->kvm)) {
sev_es_prepare_guest_switch(svm, vcpu->cpu);
} else {
vmsave(__sme_page_pa(sd->save_area));
}
if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;
if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
__this_cpu_write(current_tsc_ratio, tsc_ratio);
wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
}
}
if (likely(tsc_aux_uret_slot >= 0))
kvm_set_user_return_msr(tsc_aux_uret_slot, svm->tsc_aux, -1ull);
svm->guest_state_loaded = true;
}
static void svm_prepare_host_switch(struct kvm_vcpu *vcpu)
{
to_svm(vcpu)->guest_state_loaded = false;
}
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
if (sd->current_vmcb != svm->vmcb) {
sd->current_vmcb = svm->vmcb;
indirect_branch_prediction_barrier();
}
if (kvm_vcpu_apicv_active(vcpu))
avic_vcpu_load(vcpu, cpu);
}
static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_apicv_active(vcpu))
avic_vcpu_put(vcpu);
svm_prepare_host_switch(vcpu);
++vcpu->stat.host_state_reload;
}
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
unsigned long rflags = svm->vmcb->save.rflags;
if (svm->nmi_singlestep) {
/* Hide our flags if they were not set by the guest */
if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
rflags &= ~X86_EFLAGS_TF;
if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
rflags &= ~X86_EFLAGS_RF;
}
return rflags;
}
static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
if (to_svm(vcpu)->nmi_singlestep)
rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
/*
* Any change of EFLAGS.VM is accompanied by a reload of SS
* (caused by either a task switch or an inter-privilege IRET),
* so we do not need to update the CPL here.
*/
to_svm(vcpu)->vmcb->save.rflags = rflags;
}
static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
switch (reg) {
case VCPU_EXREG_PDPTR:
BUG_ON(!npt_enabled);
load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
break;
default:
KVM_BUG_ON(1, vcpu->kvm);
}
}
static void svm_set_vintr(struct vcpu_svm *svm)
{
struct vmcb_control_area *control;
/*
* The following fields are ignored when AVIC is enabled
*/
WARN_ON(kvm_apicv_activated(svm->vcpu.kvm));
svm_set_intercept(svm, INTERCEPT_VINTR);
/*
* This is just a dummy VINTR to actually cause a vmexit to happen.
* Actual injection of virtual interrupts happens through EVENTINJ.
*/
control = &svm->vmcb->control;
control->int_vector = 0x0;
control->int_ctl &= ~V_INTR_PRIO_MASK;
control->int_ctl |= V_IRQ_MASK |
((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
}
static void svm_clear_vintr(struct vcpu_svm *svm)
{
svm_clr_intercept(svm, INTERCEPT_VINTR);
/* Drop int_ctl fields related to VINTR injection. */
svm->vmcb->control.int_ctl &= ~V_IRQ_INJECTION_BITS_MASK;
if (is_guest_mode(&svm->vcpu)) {
svm->vmcb01.ptr->control.int_ctl &= ~V_IRQ_INJECTION_BITS_MASK;
WARN_ON((svm->vmcb->control.int_ctl & V_TPR_MASK) !=
(svm->nested.ctl.int_ctl & V_TPR_MASK));
svm->vmcb->control.int_ctl |= svm->nested.ctl.int_ctl &
V_IRQ_INJECTION_BITS_MASK;
svm->vmcb->control.int_vector = svm->nested.ctl.int_vector;
}
vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
}
static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
struct vmcb_save_area *save01 = &to_svm(vcpu)->vmcb01.ptr->save;
switch (seg) {
case VCPU_SREG_CS: return &save->cs;
case VCPU_SREG_DS: return &save->ds;
case VCPU_SREG_ES: return &save->es;
case VCPU_SREG_FS: return &save01->fs;
case VCPU_SREG_GS: return &save01->gs;
case VCPU_SREG_SS: return &save->ss;
case VCPU_SREG_TR: return &save01->tr;
case VCPU_SREG_LDTR: return &save01->ldtr;
}
BUG();
return NULL;
}
static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
struct vmcb_seg *s = svm_seg(vcpu, seg);
return s->base;
}
static void svm_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
struct vmcb_seg *s = svm_seg(vcpu, seg);
var->base = s->base;
var->limit = s->limit;
var->selector = s->selector;
var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
/*
* AMD CPUs circa 2014 track the G bit for all segments except CS.
* However, the SVM spec states that the G bit is not observed by the
* CPU, and some VMware virtual CPUs drop the G bit for all segments.
* So let's synthesize a legal G bit for all segments, this helps
* running KVM nested. It also helps cross-vendor migration, because
* Intel's vmentry has a check on the 'G' bit.
*/
var->g = s->limit > 0xfffff;
/*
* AMD's VMCB does not have an explicit unusable field, so emulate it
* for cross vendor migration purposes by "not present"
*/
var->unusable = !var->present;
switch (seg) {
case VCPU_SREG_TR:
/*
* Work around a bug where the busy flag in the tr selector
* isn't exposed
*/
var->type |= 0x2;
break;
case VCPU_SREG_DS:
case VCPU_SREG_ES:
case VCPU_SREG_FS:
case VCPU_SREG_GS:
/*
* The accessed bit must always be set in the segment
* descriptor cache, although it can be cleared in the
* descriptor, the cached bit always remains at 1. Since
* Intel has a check on this, set it here to support
* cross-vendor migration.
*/
if (!var->unusable)
var->type |= 0x1;
break;
case VCPU_SREG_SS:
/*
* On AMD CPUs sometimes the DB bit in the segment
* descriptor is left as 1, although the whole segment has
* been made unusable. Clear it here to pass an Intel VMX
* entry check when cross vendor migrating.
*/
if (var->unusable)
var->db = 0;
/* This is symmetric with svm_set_segment() */
var->dpl = to_svm(vcpu)->vmcb->save.cpl;
break;
}
}
static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
return save->cpl;
}
static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
struct vcpu_svm *svm = to_svm(vcpu);
dt->size = svm->vmcb->save.idtr.limit;
dt->address = svm->vmcb->save.idtr.base;
}
static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->save.idtr.limit = dt->size;
svm->vmcb->save.idtr.base = dt->address ;
vmcb_mark_dirty(svm->vmcb, VMCB_DT);
}
static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
struct vcpu_svm *svm = to_svm(vcpu);
dt->size = svm->vmcb->save.gdtr.limit;
dt->address = svm->vmcb->save.gdtr.base;
}
static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->save.gdtr.limit = dt->size;
svm->vmcb->save.gdtr.base = dt->address ;
vmcb_mark_dirty(svm->vmcb, VMCB_DT);
}
void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 hcr0 = cr0;
#ifdef CONFIG_X86_64
if (vcpu->arch.efer & EFER_LME && !vcpu->arch.guest_state_protected) {
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
vcpu->arch.efer |= EFER_LMA;
svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
}
if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
vcpu->arch.efer &= ~EFER_LMA;
svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
}
}
#endif
vcpu->arch.cr0 = cr0;
if (!npt_enabled)
hcr0 |= X86_CR0_PG | X86_CR0_WP;
/*
* re-enable caching here because the QEMU bios
* does not do it - this results in some delay at
* reboot
*/
if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
hcr0 &= ~(X86_CR0_CD | X86_CR0_NW);
svm->vmcb->save.cr0 = hcr0;
vmcb_mark_dirty(svm->vmcb, VMCB_CR);
/*
* SEV-ES guests must always keep the CR intercepts cleared. CR
* tracking is done using the CR write traps.
*/
if (sev_es_guest(vcpu->kvm))
return;
if (hcr0 == cr0) {
/* Selective CR0 write remains on. */
svm_clr_intercept(svm, INTERCEPT_CR0_READ);
svm_clr_intercept(svm, INTERCEPT_CR0_WRITE);
} else {
svm_set_intercept(svm, INTERCEPT_CR0_READ);
svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
}
}
static bool svm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
return true;
}
void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
unsigned long old_cr4 = vcpu->arch.cr4;
if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
svm_flush_tlb(vcpu);
vcpu->arch.cr4 = cr4;
if (!npt_enabled)
cr4 |= X86_CR4_PAE;
cr4 |= host_cr4_mce;
to_svm(vcpu)->vmcb->save.cr4 = cr4;
vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
kvm_update_cpuid_runtime(vcpu);
}
static void svm_set_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_seg *s = svm_seg(vcpu, seg);
s->base = var->base;
s->limit = var->limit;
s->selector = var->selector;
s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
/*
* This is always accurate, except if SYSRET returned to a segment
* with SS.DPL != 3. Intel does not have this quirk, and always
* forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
* would entail passing the CPL to userspace and back.
*/
if (seg == VCPU_SREG_SS)
/* This is symmetric with svm_get_segment() */
svm->vmcb->save.cpl = (var->dpl & 3);
vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
}
static void svm_update_exception_bitmap(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
clr_exception_intercept(svm, BP_VECTOR);
if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
set_exception_intercept(svm, BP_VECTOR);
}
}
static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
{
if (sd->next_asid > sd->max_asid) {
++sd->asid_generation;
sd->next_asid = sd->min_asid;
svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
}
svm->current_vmcb->asid_generation = sd->asid_generation;
svm->asid = sd->next_asid++;
}
static void svm_set_dr6(struct vcpu_svm *svm, unsigned long value)
{
struct vmcb *vmcb = svm->vmcb;
if (svm->vcpu.arch.guest_state_protected)
return;
if (unlikely(value != vmcb->save.dr6)) {
vmcb->save.dr6 = value;
vmcb_mark_dirty(vmcb, VMCB_DR);
}
}
static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (vcpu->arch.guest_state_protected)
return;
get_debugreg(vcpu->arch.db[0], 0);
get_debugreg(vcpu->arch.db[1], 1);
get_debugreg(vcpu->arch.db[2], 2);
get_debugreg(vcpu->arch.db[3], 3);
/*
* We cannot reset svm->vmcb->save.dr6 to DR6_ACTIVE_LOW here,
* because db_interception might need it. We can do it before vmentry.
*/
vcpu->arch.dr6 = svm->vmcb->save.dr6;
vcpu->arch.dr7 = svm->vmcb->save.dr7;
vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
set_dr_intercepts(svm);
}
static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (vcpu->arch.guest_state_protected)
return;
svm->vmcb->save.dr7 = value;
vmcb_mark_dirty(svm->vmcb, VMCB_DR);
}
static int pf_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 fault_address = svm->vmcb->control.exit_info_2;
u64 error_code = svm->vmcb->control.exit_info_1;
return kvm_handle_page_fault(vcpu, error_code, fault_address,
static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
svm->vmcb->control.insn_bytes : NULL,
svm->vmcb->control.insn_len);
}
static int npf_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 fault_address = svm->vmcb->control.exit_info_2;
u64 error_code = svm->vmcb->control.exit_info_1;
trace_kvm_page_fault(fault_address, error_code);
return kvm_mmu_page_fault(vcpu, fault_address, error_code,
static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
svm->vmcb->control.insn_bytes : NULL,
svm->vmcb->control.insn_len);
}
static int db_interception(struct kvm_vcpu *vcpu)
{
struct kvm_run *kvm_run = vcpu->run;
struct vcpu_svm *svm = to_svm(vcpu);
if (!(vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
!svm->nmi_singlestep) {
u32 payload = svm->vmcb->save.dr6 ^ DR6_ACTIVE_LOW;
kvm_queue_exception_p(vcpu, DB_VECTOR, payload);
return 1;
}
if (svm->nmi_singlestep) {
disable_nmi_singlestep(svm);
/* Make sure we check for pending NMIs upon entry */
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
if (vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
kvm_run->exit_reason = KVM_EXIT_DEBUG;
kvm_run->debug.arch.dr6 = svm->vmcb->save.dr6;
kvm_run->debug.arch.dr7 = svm->vmcb->save.dr7;
kvm_run->debug.arch.pc =
svm->vmcb->save.cs.base + svm->vmcb->save.rip;
kvm_run->debug.arch.exception = DB_VECTOR;
return 0;
}
return 1;
}
static int bp_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_run *kvm_run = vcpu->run;
kvm_run->exit_reason = KVM_EXIT_DEBUG;
kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
kvm_run->debug.arch.exception = BP_VECTOR;
return 0;
}
static int ud_interception(struct kvm_vcpu *vcpu)
{
return handle_ud(vcpu);
}
static int ac_interception(struct kvm_vcpu *vcpu)
{
kvm_queue_exception_e(vcpu, AC_VECTOR, 0);
return 1;
}
static bool is_erratum_383(void)
{
int err, i;
u64 value;
if (!erratum_383_found)
return false;
value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
if (err)
return false;
/* Bit 62 may or may not be set for this mce */
value &= ~(1ULL << 62);
if (value != 0xb600000000010015ULL)
return false;
/* Clear MCi_STATUS registers */
for (i = 0; i < 6; ++i)
native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);
value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
if (!err) {
u32 low, high;
value &= ~(1ULL << 2);
low = lower_32_bits(value);
high = upper_32_bits(value);
native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
}
/* Flush tlb to evict multi-match entries */
__flush_tlb_all();
return true;
}
static void svm_handle_mce(struct kvm_vcpu *vcpu)
{
if (is_erratum_383()) {
/*
* Erratum 383 triggered. Guest state is corrupt so kill the
* guest.
*/
pr_err("KVM: Guest triggered AMD Erratum 383\n");
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
/*
* On an #MC intercept the MCE handler is not called automatically in
* the host. So do it by hand here.
*/
kvm_machine_check();
}
static int mc_interception(struct kvm_vcpu *vcpu)
{
return 1;
}
static int shutdown_interception(struct kvm_vcpu *vcpu)
{
struct kvm_run *kvm_run = vcpu->run;
struct vcpu_svm *svm = to_svm(vcpu);
/*
* The VM save area has already been encrypted so it
* cannot be reinitialized - just terminate.
*/
if (sev_es_guest(vcpu->kvm))
return -EINVAL;
/*
* VMCB is undefined after a SHUTDOWN intercept. INIT the vCPU to put
* the VMCB in a known good state. Unfortuately, KVM doesn't have
* KVM_MP_STATE_SHUTDOWN and can't add it without potentially breaking
* userspace. At a platform view, INIT is acceptable behavior as
* there exist bare metal platforms that automatically INIT the CPU
* in response to shutdown.
*/
clear_page(svm->vmcb);
kvm_vcpu_reset(vcpu, true);
kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
return 0;
}
static int io_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
int size, in, string;
unsigned port;
++vcpu->stat.io_exits;
string = (io_info & SVM_IOIO_STR_MASK) != 0;
in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
port = io_info >> 16;
size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
if (string) {
if (sev_es_guest(vcpu->kvm))
return sev_es_string_io(svm, size, port, in);
else
return kvm_emulate_instruction(vcpu, 0);
}
svm->next_rip = svm->vmcb->control.exit_info_2;
return kvm_fast_pio(vcpu, size, port, in);
}
static int nmi_interception(struct kvm_vcpu *vcpu)
{
return 1;
}
static int smi_interception(struct kvm_vcpu *vcpu)
{
return 1;
}
static int intr_interception(struct kvm_vcpu *vcpu)
{
++vcpu->stat.irq_exits;
return 1;
}
static int vmload_vmsave_interception(struct kvm_vcpu *vcpu, bool vmload)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb *vmcb12;
struct kvm_host_map map;
int ret;
if (nested_svm_check_permissions(vcpu))
return 1;
ret = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
if (ret) {
if (ret == -EINVAL)
kvm_inject_gp(vcpu, 0);
return 1;
}
vmcb12 = map.hva;
ret = kvm_skip_emulated_instruction(vcpu);
if (vmload) {
svm_copy_vmloadsave_state(svm->vmcb, vmcb12);
svm->sysenter_eip_hi = 0;
svm->sysenter_esp_hi = 0;
} else {
svm_copy_vmloadsave_state(vmcb12, svm->vmcb);
}
kvm_vcpu_unmap(vcpu, &map, true);
return ret;
}
static int vmload_interception(struct kvm_vcpu *vcpu)
{
return vmload_vmsave_interception(vcpu, true);
}
static int vmsave_interception(struct kvm_vcpu *vcpu)
{
return vmload_vmsave_interception(vcpu, false);
}
static int vmrun_interception(struct kvm_vcpu *vcpu)
{
if (nested_svm_check_permissions(vcpu))
return 1;
return nested_svm_vmrun(vcpu);
}
enum {
NONE_SVM_INSTR,
SVM_INSTR_VMRUN,
SVM_INSTR_VMLOAD,
SVM_INSTR_VMSAVE,
};
/* Return NONE_SVM_INSTR if not SVM instrs, otherwise return decode result */
static int svm_instr_opcode(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
if (ctxt->b != 0x1 || ctxt->opcode_len != 2)
return NONE_SVM_INSTR;
switch (ctxt->modrm) {
case 0xd8: /* VMRUN */
return SVM_INSTR_VMRUN;
case 0xda: /* VMLOAD */
return SVM_INSTR_VMLOAD;
case 0xdb: /* VMSAVE */
return SVM_INSTR_VMSAVE;
default:
break;
}
return NONE_SVM_INSTR;
}
static int emulate_svm_instr(struct kvm_vcpu *vcpu, int opcode)
{
const int guest_mode_exit_codes[] = {
[SVM_INSTR_VMRUN] = SVM_EXIT_VMRUN,
[SVM_INSTR_VMLOAD] = SVM_EXIT_VMLOAD,
[SVM_INSTR_VMSAVE] = SVM_EXIT_VMSAVE,
};
int (*const svm_instr_handlers[])(struct kvm_vcpu *vcpu) = {
[SVM_INSTR_VMRUN] = vmrun_interception,
[SVM_INSTR_VMLOAD] = vmload_interception,
[SVM_INSTR_VMSAVE] = vmsave_interception,
};
struct vcpu_svm *svm = to_svm(vcpu);
int ret;
if (is_guest_mode(vcpu)) {
/* Returns '1' or -errno on failure, '0' on success. */
ret = nested_svm_simple_vmexit(svm, guest_mode_exit_codes[opcode]);
if (ret)
return ret;
return 1;
}
return svm_instr_handlers[opcode](vcpu);
}
/*
* #GP handling code. Note that #GP can be triggered under the following two
* cases:
* 1) SVM VM-related instructions (VMRUN/VMSAVE/VMLOAD) that trigger #GP on
* some AMD CPUs when EAX of these instructions are in the reserved memory
* regions (e.g. SMM memory on host).
* 2) VMware backdoor
*/
static int gp_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u32 error_code = svm->vmcb->control.exit_info_1;
int opcode;
/* Both #GP cases have zero error_code */
if (error_code)
goto reinject;
/* All SVM instructions expect page aligned RAX */
if (svm->vmcb->save.rax & ~PAGE_MASK)
goto reinject;
/* Decode the instruction for usage later */
if (x86_decode_emulated_instruction(vcpu, 0, NULL, 0) != EMULATION_OK)
goto reinject;
opcode = svm_instr_opcode(vcpu);
if (opcode == NONE_SVM_INSTR) {
if (!enable_vmware_backdoor)
goto reinject;
/*
* VMware backdoor emulation on #GP interception only handles
* IN{S}, OUT{S}, and RDPMC.
*/
if (!is_guest_mode(vcpu))
return kvm_emulate_instruction(vcpu,
EMULTYPE_VMWARE_GP | EMULTYPE_NO_DECODE);
} else
return emulate_svm_instr(vcpu, opcode);
reinject:
kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
return 1;
}
void svm_set_gif(struct vcpu_svm *svm, bool value)
{
if (value) {
/*
* If VGIF is enabled, the STGI intercept is only added to
* detect the opening of the SMI/NMI window; remove it now.
* Likewise, clear the VINTR intercept, we will set it
* again while processing KVM_REQ_EVENT if needed.
*/
if (vgif_enabled(svm))
svm_clr_intercept(svm, INTERCEPT_STGI);
if (svm_is_intercept(svm, INTERCEPT_VINTR))
svm_clear_vintr(svm);
enable_gif(svm);
if (svm->vcpu.arch.smi_pending ||
svm->vcpu.arch.nmi_pending ||
kvm_cpu_has_injectable_intr(&svm->vcpu))
kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
} else {
disable_gif(svm);
/*
* After a CLGI no interrupts should come. But if vGIF is
* in use, we still rely on the VINTR intercept (rather than
* STGI) to detect an open interrupt window.
*/
if (!vgif_enabled(svm))
svm_clear_vintr(svm);
}
}
static int stgi_interception(struct kvm_vcpu *vcpu)
{
int ret;
if (nested_svm_check_permissions(vcpu))
return 1;
ret = kvm_skip_emulated_instruction(vcpu);
svm_set_gif(to_svm(vcpu), true);
return ret;
}
static int clgi_interception(struct kvm_vcpu *vcpu)
{
int ret;
if (nested_svm_check_permissions(vcpu))
return 1;
ret = kvm_skip_emulated_instruction(vcpu);
svm_set_gif(to_svm(vcpu), false);
return ret;
}
static int invlpga_interception(struct kvm_vcpu *vcpu)
{
gva_t gva = kvm_rax_read(vcpu);
u32 asid = kvm_rcx_read(vcpu);
/* FIXME: Handle an address size prefix. */
if (!is_long_mode(vcpu))
gva = (u32)gva;
trace_kvm_invlpga(to_svm(vcpu)->vmcb->save.rip, asid, gva);
/* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
kvm_mmu_invlpg(vcpu, gva);
return kvm_skip_emulated_instruction(vcpu);
}
static int skinit_interception(struct kvm_vcpu *vcpu)
{
trace_kvm_skinit(to_svm(vcpu)->vmcb->save.rip, kvm_rax_read(vcpu));
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
static int task_switch_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u16 tss_selector;
int reason;
int int_type = svm->vmcb->control.exit_int_info &
SVM_EXITINTINFO_TYPE_MASK;
int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
uint32_t type =
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
uint32_t idt_v =
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
bool has_error_code = false;
u32 error_code = 0;
tss_selector = (u16)svm->vmcb->control.exit_info_1;
if (svm->vmcb->control.exit_info_2 &
(1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
reason = TASK_SWITCH_IRET;
else if (svm->vmcb->control.exit_info_2 &
(1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
reason = TASK_SWITCH_JMP;
else if (idt_v)
reason = TASK_SWITCH_GATE;
else
reason = TASK_SWITCH_CALL;
if (reason == TASK_SWITCH_GATE) {
switch (type) {
case SVM_EXITINTINFO_TYPE_NMI:
vcpu->arch.nmi_injected = false;
break;
case SVM_EXITINTINFO_TYPE_EXEPT:
if (svm->vmcb->control.exit_info_2 &
(1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
has_error_code = true;
error_code =
(u32)svm->vmcb->control.exit_info_2;
}
kvm_clear_exception_queue(vcpu);
break;
case SVM_EXITINTINFO_TYPE_INTR:
kvm_clear_interrupt_queue(vcpu);
break;
default:
break;
}
}
if (reason != TASK_SWITCH_GATE ||
int_type == SVM_EXITINTINFO_TYPE_SOFT ||
(int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
(int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
if (!skip_emulated_instruction(vcpu))
return 0;
}
if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
int_vec = -1;
return kvm_task_switch(vcpu, tss_selector, int_vec, reason,
has_error_code, error_code);
}
static int iret_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
++vcpu->stat.nmi_window_exits;
vcpu->arch.hflags |= HF_IRET_MASK;
if (!sev_es_guest(vcpu->kvm)) {
svm_clr_intercept(svm, INTERCEPT_IRET);
svm->nmi_iret_rip = kvm_rip_read(vcpu);
}
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
static int invlpg_interception(struct kvm_vcpu *vcpu)
{
if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
return kvm_emulate_instruction(vcpu, 0);
kvm_mmu_invlpg(vcpu, to_svm(vcpu)->vmcb->control.exit_info_1);
return kvm_skip_emulated_instruction(vcpu);
}
static int emulate_on_interception(struct kvm_vcpu *vcpu)
{
return kvm_emulate_instruction(vcpu, 0);
}
static int rsm_interception(struct kvm_vcpu *vcpu)
{
return kvm_emulate_instruction_from_buffer(vcpu, rsm_ins_bytes, 2);
}
static bool check_selective_cr0_intercepted(struct kvm_vcpu *vcpu,
unsigned long val)
{
struct vcpu_svm *svm = to_svm(vcpu);
unsigned long cr0 = vcpu->arch.cr0;
bool ret = false;
if (!is_guest_mode(vcpu) ||
(!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0))))
return false;
cr0 &= ~SVM_CR0_SELECTIVE_MASK;
val &= ~SVM_CR0_SELECTIVE_MASK;
if (cr0 ^ val) {
svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
}
return ret;
}
#define CR_VALID (1ULL << 63)
static int cr_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
int reg, cr;
unsigned long val;
int err;
if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
return emulate_on_interception(vcpu);
if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
return emulate_on_interception(vcpu);
reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE)
cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0;
else
cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;
err = 0;
if (cr >= 16) { /* mov to cr */
cr -= 16;
val = kvm_register_read(vcpu, reg);
trace_kvm_cr_write(cr, val);
switch (cr) {
case 0:
if (!check_selective_cr0_intercepted(vcpu, val))
err = kvm_set_cr0(vcpu, val);
else
return 1;
break;
case 3:
err = kvm_set_cr3(vcpu, val);
break;
case 4:
err = kvm_set_cr4(vcpu, val);
break;
case 8:
err = kvm_set_cr8(vcpu, val);
break;
default:
WARN(1, "unhandled write to CR%d", cr);
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
} else { /* mov from cr */
switch (cr) {
case 0:
val = kvm_read_cr0(vcpu);
break;
case 2:
val = vcpu->arch.cr2;
break;
case 3:
val = kvm_read_cr3(vcpu);
break;
case 4:
val = kvm_read_cr4(vcpu);
break;
case 8:
val = kvm_get_cr8(vcpu);
break;
default:
WARN(1, "unhandled read from CR%d", cr);
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
kvm_register_write(vcpu, reg, val);
trace_kvm_cr_read(cr, val);
}
return kvm_complete_insn_gp(vcpu, err);
}
static int cr_trap(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
unsigned long old_value, new_value;
unsigned int cr;
int ret = 0;
new_value = (unsigned long)svm->vmcb->control.exit_info_1;
cr = svm->vmcb->control.exit_code - SVM_EXIT_CR0_WRITE_TRAP;
switch (cr) {
case 0:
old_value = kvm_read_cr0(vcpu);
svm_set_cr0(vcpu, new_value);
kvm_post_set_cr0(vcpu, old_value, new_value);
break;
case 4:
old_value = kvm_read_cr4(vcpu);
svm_set_cr4(vcpu, new_value);
kvm_post_set_cr4(vcpu, old_value, new_value);
break;
case 8:
ret = kvm_set_cr8(vcpu, new_value);
break;
default:
WARN(1, "unhandled CR%d write trap", cr);
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
return kvm_complete_insn_gp(vcpu, ret);
}
static int dr_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
int reg, dr;
unsigned long val;
int err = 0;
if (vcpu->guest_debug == 0) {
/*
* No more DR vmexits; force a reload of the debug registers
* and reenter on this instruction. The next vmexit will
* retrieve the full state of the debug registers.
*/
clr_dr_intercepts(svm);
vcpu->arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
return 1;
}
if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
return emulate_on_interception(vcpu);
reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
if (dr >= 16) { /* mov to DRn */
dr -= 16;
val = kvm_register_read(vcpu, reg);
err = kvm_set_dr(vcpu, dr, val);
} else {
kvm_get_dr(vcpu, dr, &val);
kvm_register_write(vcpu, reg, val);
}
return kvm_complete_insn_gp(vcpu, err);
}
static int cr8_write_interception(struct kvm_vcpu *vcpu)
{
int r;
u8 cr8_prev = kvm_get_cr8(vcpu);
/* instruction emulation calls kvm_set_cr8() */
r = cr_interception(vcpu);
if (lapic_in_kernel(vcpu))
return r;
if (cr8_prev <= kvm_get_cr8(vcpu))
return r;
vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
return 0;
}
static int efer_trap(struct kvm_vcpu *vcpu)
{
struct msr_data msr_info;
int ret;
/*
* Clear the EFER_SVME bit from EFER. The SVM code always sets this
* bit in svm_set_efer(), but __kvm_valid_efer() checks it against
* whether the guest has X86_FEATURE_SVM - this avoids a failure if
* the guest doesn't have X86_FEATURE_SVM.
*/
msr_info.host_initiated = false;
msr_info.index = MSR_EFER;
msr_info.data = to_svm(vcpu)->vmcb->control.exit_info_1 & ~EFER_SVME;
ret = kvm_set_msr_common(vcpu, &msr_info);
return kvm_complete_insn_gp(vcpu, ret);
}
static int svm_get_msr_feature(struct kvm_msr_entry *msr)
{
msr->data = 0;
switch (msr->index) {
case MSR_F10H_DECFG:
if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC))
msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE;
break;
case MSR_IA32_PERF_CAPABILITIES:
return 0;
default:
return KVM_MSR_RET_INVALID;
}
return 0;
}
static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
struct vcpu_svm *svm = to_svm(vcpu);
switch (msr_info->index) {
case MSR_STAR:
msr_info->data = svm->vmcb01.ptr->save.star;
break;
#ifdef CONFIG_X86_64
case MSR_LSTAR:
msr_info->data = svm->vmcb01.ptr->save.lstar;
break;
case MSR_CSTAR:
msr_info->data = svm->vmcb01.ptr->save.cstar;
break;
case MSR_KERNEL_GS_BASE:
msr_info->data = svm->vmcb01.ptr->save.kernel_gs_base;
break;
case MSR_SYSCALL_MASK:
msr_info->data = svm->vmcb01.ptr->save.sfmask;
break;
#endif
case MSR_IA32_SYSENTER_CS:
msr_info->data = svm->vmcb01.ptr->save.sysenter_cs;
break;
case MSR_IA32_SYSENTER_EIP:
msr_info->data = (u32)svm->vmcb01.ptr->save.sysenter_eip;
if (guest_cpuid_is_intel(vcpu))
msr_info->data |= (u64)svm->sysenter_eip_hi << 32;
break;
case MSR_IA32_SYSENTER_ESP:
msr_info->data = svm->vmcb01.ptr->save.sysenter_esp;
if (guest_cpuid_is_intel(vcpu))
msr_info->data |= (u64)svm->sysenter_esp_hi << 32;
break;
case MSR_TSC_AUX:
msr_info->data = svm->tsc_aux;
break;
/*
* Nobody will change the following 5 values in the VMCB so we can
* safely return them on rdmsr. They will always be 0 until LBRV is
* implemented.
*/
case MSR_IA32_DEBUGCTLMSR:
msr_info->data = svm->vmcb->save.dbgctl;
break;
case MSR_IA32_LASTBRANCHFROMIP:
msr_info->data = svm->vmcb->save.br_from;
break;
case MSR_IA32_LASTBRANCHTOIP:
msr_info->data = svm->vmcb->save.br_to;
break;
case MSR_IA32_LASTINTFROMIP:
msr_info->data = svm->vmcb->save.last_excp_from;
break;
case MSR_IA32_LASTINTTOIP:
msr_info->data = svm->vmcb->save.last_excp_to;
break;
case MSR_VM_HSAVE_PA:
msr_info->data = svm->nested.hsave_msr;
break;
case MSR_VM_CR:
msr_info->data = svm->nested.vm_cr_msr;
break;
case MSR_IA32_SPEC_CTRL:
if (!msr_info->host_initiated &&
!guest_has_spec_ctrl_msr(vcpu))
return 1;
if (boot_cpu_has(X86_FEATURE_V_SPEC_CTRL))
msr_info->data = svm->vmcb->save.spec_ctrl;
else
msr_info->data = svm->spec_ctrl;
break;
case MSR_AMD64_VIRT_SPEC_CTRL:
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD))
return 1;
msr_info->data = svm->virt_spec_ctrl;
break;
case MSR_F15H_IC_CFG: {
int family, model;
family = guest_cpuid_family(vcpu);
model = guest_cpuid_model(vcpu);
if (family < 0 || model < 0)
return kvm_get_msr_common(vcpu, msr_info);
msr_info->data = 0;
if (family == 0x15 &&
(model >= 0x2 && model < 0x20))
msr_info->data = 0x1E;
}
break;
case MSR_F10H_DECFG:
msr_info->data = svm->msr_decfg;
break;
default:
return kvm_get_msr_common(vcpu, msr_info);
}
return 0;
}
static int svm_complete_emulated_msr(struct kvm_vcpu *vcpu, int err)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (!err || !sev_es_guest(vcpu->kvm) || WARN_ON_ONCE(!svm->ghcb))
return kvm_complete_insn_gp(vcpu, err);
ghcb_set_sw_exit_info_1(svm->ghcb, 1);
ghcb_set_sw_exit_info_2(svm->ghcb,
X86_TRAP_GP |
SVM_EVTINJ_TYPE_EXEPT |
SVM_EVTINJ_VALID);
return 1;
}
static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
{
struct vcpu_svm *svm = to_svm(vcpu);
int svm_dis, chg_mask;
if (data & ~SVM_VM_CR_VALID_MASK)
return 1;
chg_mask = SVM_VM_CR_VALID_MASK;
if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
svm->nested.vm_cr_msr &= ~chg_mask;
svm->nested.vm_cr_msr |= (data & chg_mask);
svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
/* check for svm_disable while efer.svme is set */
if (svm_dis && (vcpu->arch.efer & EFER_SVME))
return 1;
return 0;
}</