tree 62f084ef70a2ab09013c1d7c6f3abbfae2124103
parent 7117003fe4e3c8977744f2ad33bb95fd3e10023f
author Sean Christopherson <seanjc@google.com> 1632182575 -0700
committer Paolo Bonzini <pbonzini@redhat.com> 1632321188 -0400

KVM: x86: Clear KVM's cached guest CR3 at RESET/INIT

Explicitly zero the guest's CR3 and mark it available+dirty at RESET/INIT.
Per Intel's SDM and AMD's APM, CR3 is zeroed at both RESET and INIT.  For
RESET, this is a nop as vcpu is zero-allocated.  For INIT, the bug has
likely escaped notice because no firmware/kernel puts its page tables root
at PA=0, let alone relies on INIT to get the desired CR3 for such page
tables.

Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210921000303.400537-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>