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KVM: nSVM: Set the shadow root level to the TDP level for nested NPT

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commit a3322d5cd87fef5ec0037fd1b14068a533f9a60f upstream.

Override the shadow root level in the MMU context when configuring
NPT for shadowing nested NPT.  The level is always tied to the TDP level
of the host, not whatever level the guest happens to be using.

Fixes: 096586fda5 ("KVM: nSVM: Correctly set the shadow NPT root level in its MMU role")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305011101.3597423-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2021-03-04 17:10:45 -08:00 committed by Greg Kroah-Hartman
parent f59c2220f6
commit 12d6843025
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kvm/mmu/mmu.c
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@ -4617,12 +4617,17 @@ void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer,
struct kvm_mmu *context = &vcpu->arch.guest_mmu;
union kvm_mmu_role new_role = kvm_calc_shadow_npt_root_page_role(vcpu);
context->shadow_root_level = new_role.base.level;
__kvm_mmu_new_pgd(vcpu, nested_cr3, new_role.base, false, false);
if (new_role.as_u64 != context->mmu_role.as_u64)
if (new_role.as_u64 != context->mmu_role.as_u64) {
shadow_mmu_init_context(vcpu, context, cr0, cr4, efer, new_role);
/*
* Override the level set by the common init helper, nested TDP
* always uses the host's TDP configuration.
*/
context->shadow_root_level = new_role.base.level;
}
}
EXPORT_SYMBOL_GPL(kvm_init_shadow_npt_mmu);