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KVM: x86/mmu: Assert on @mmu in the __kvm_mmu_invalidate_addr()

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Add assertion to track that "mmu == vcpu->arch.mmu" is always true in the
context of __kvm_mmu_invalidate_addr(). for_each_shadow_entry_using_root()
and kvm_sync_spte() operate on vcpu->arch.mmu, but the only reason that
doesn't cause explosions is because handle_invept() frees roots instead of
doing a manual invalidation.  As of now, there are no major roadblocks
to switching INVEPT emulation over to use kvm_mmu_invalidate_addr().

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Like Xu <likexu@tencent.com>
Link: https://lore.kernel.org/r/20230523032947.60041-1-likexu@tencent.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Like Xu
2023-05-23 11:29:47 +08:00
committed by Sean Christopherson
parent 12ced09595
commit 762b33eb90
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/mmu/mmu.c
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@@ -5797,6 +5797,14 @@ static void __kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu
vcpu_clear_mmio_info(vcpu, addr);
/*
* Walking and synchronizing SPTEs both assume they are operating in
* the context of the current MMU, and would need to be reworked if
* this is ever used to sync the guest_mmu, e.g. to emulate INVEPT.
*/
if (WARN_ON_ONCE(mmu != vcpu->arch.mmu))
return;
if (!VALID_PAGE(root_hpa))
return;