| // SPDX-License-Identifier: GPL-2.0-only |
| |
| #include "error.h" |
| #include "misc.h" |
| #include "tdx.h" |
| #include "sev.h" |
| #include <asm/shared/tdx.h> |
| |
| /* |
| * accept_memory() and process_unaccepted_memory() called from EFI stub which |
| * runs before decompresser and its early_tdx_detect(). |
| * |
| * Enumerate TDX directly from the early users. |
| */ |
| static bool early_is_tdx_guest(void) |
| { |
| static bool once; |
| static bool is_tdx; |
| |
| if (!IS_ENABLED(CONFIG_INTEL_TDX_GUEST)) |
| return false; |
| |
| if (!once) { |
| u32 eax, sig[3]; |
| |
| cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, |
| &sig[0], &sig[2], &sig[1]); |
| is_tdx = !memcmp(TDX_IDENT, sig, sizeof(sig)); |
| once = true; |
| } |
| |
| return is_tdx; |
| } |
| |
| void arch_accept_memory(phys_addr_t start, phys_addr_t end) |
| { |
| /* Platform-specific memory-acceptance call goes here */ |
| if (early_is_tdx_guest()) { |
| if (!tdx_accept_memory(start, end)) |
| panic("TDX: Failed to accept memory\n"); |
| } else if (sev_snp_enabled()) { |
| snp_accept_memory(start, end); |
| } else { |
| error("Cannot accept memory: unknown platform\n"); |
| } |
| } |
| |
| bool init_unaccepted_memory(void) |
| { |
| guid_t guid = LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID; |
| struct efi_unaccepted_memory *table; |
| unsigned long cfg_table_pa; |
| unsigned int cfg_table_len; |
| enum efi_type et; |
| int ret; |
| |
| et = efi_get_type(boot_params_ptr); |
| if (et == EFI_TYPE_NONE) |
| return false; |
| |
| ret = efi_get_conf_table(boot_params_ptr, &cfg_table_pa, &cfg_table_len); |
| if (ret) { |
| warn("EFI config table not found."); |
| return false; |
| } |
| |
| table = (void *)efi_find_vendor_table(boot_params_ptr, cfg_table_pa, |
| cfg_table_len, guid); |
| if (!table) |
| return false; |
| |
| if (table->version != 1) |
| error("Unknown version of unaccepted memory table\n"); |
| |
| /* |
| * In many cases unaccepted_table is already set by EFI stub, but it |
| * has to be initialized again to cover cases when the table is not |
| * allocated by EFI stub or EFI stub copied the kernel image with |
| * efi_relocate_kernel() before the variable is set. |
| * |
| * It must be initialized before the first usage of accept_memory(). |
| */ |
| unaccepted_table = table; |
| |
| return true; |
| } |