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kvm: x86/mmu: Use cpuid to determine max gfn

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In the TDP MMU, use shadow_phys_bits to dermine the maximum possible GFN
mapped in the guest for zapping operations. boot_cpu_data.x86_phys_bits
may be reduced in the case of HW features that steal HPA bits for other
purposes. However, this doesn't necessarily reduce GPA space that can be
accessed via TDP. So zap based on a maximum gfn calculated with MAXPHYADDR
retrieved from CPUID. This is already stored in shadow_phys_bits, so use
it instead of x86_phys_bits.

Fixes: faaf05b00aec ("kvm: x86/mmu: Support zapping SPTEs in the TDP MMU")
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Message-Id: <20201203231120.27307-1-rick.p.edgecombe@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Rick Edgecombe 2020-12-03 15:11:20 -08:00 committed by Paolo Bonzini
parent a2b2d4bf50
commit 339f5a7fb2
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/mmu/tdp_mmu.c
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@ -66,7 +66,7 @@ static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root)
{
gfn_t max_gfn = 1ULL << (boot_cpu_data.x86_phys_bits - PAGE_SHIFT);
gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT);
lockdep_assert_held(&kvm->mmu_lock);
@ -456,7 +456,7 @@ bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end)
void kvm_tdp_mmu_zap_all(struct kvm *kvm)
{
gfn_t max_gfn = 1ULL << (boot_cpu_data.x86_phys_bits - PAGE_SHIFT);
gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT);
bool flush;
flush = kvm_tdp_mmu_zap_gfn_range(kvm, 0, max_gfn);