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KVM: x86: Use KVM_REQ_TLB_FLUSH_GUEST to handle INVPCID(ALL) emulation

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Use KVM_REQ_TLB_FLUSH_GUEST instead of KVM_REQ_MMU_RELOAD when emulating
INVPCID of all contexts.  In the current code, this is a glorified nop as
TLB_FLUSH_GUEST becomes kvm_mmu_unload(), same as MMU_RELOAD, when TDP
is disabled, which is the only time INVPCID is only intercepted+emulated.
In the future, reusing TLB_FLUSH_GUEST will simplify optimizing paths
that emulate a guest TLB flush, e.g. by synchronizing as needed instead
of completely unloading all MMUs.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210609234235.1244004-11-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-09 16:42:30 -07:00 • committed by Paolo Bonzini
parent 25b62c6274
commit 28f28d453f
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/x86.c
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@ -12031,7 +12031,7 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
fallthrough;
case INVPCID_TYPE_ALL_INCL_GLOBAL:
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
return kvm_skip_emulated_instruction(vcpu);
default: