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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-07-10 16:11:57 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-10 19:03:12 +0200 |
| commit | fe9304d31831c9ee3943f9a6f72b7cea16d4bc11 (patch) | |
| tree | 4a60436a122b9a5b50e7f7510a148518fdb4b563 /arch/x86 | |
| parent | KVM: nSVM: use nested_svm_load_cr3() on guest->host switch (diff) | |
| download | linux-fe9304d31831c9ee3943f9a6f72b7cea16d4bc11.tar.xz linux-fe9304d31831c9ee3943f9a6f72b7cea16d4bc11.zip | |
KVM: x86: drop superfluous mmu_check_root() from fast_pgd_switch()
The mmu_check_root() check in fast_pgd_switch() seems to be
superfluous: when GPA is outside of the visible range
cached_root_available() will fail for non-direct roots
(as we can't have a matching one on the list) and we don't
seem to care for direct ones.
Also, raising #TF immediately when a non-existent GFN is written to CR3
doesn't seem to mach architectural behavior. Drop the check.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200710141157.1640173-10-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 61c35fec5219..613c33149428 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4243,8 +4243,7 @@ static bool fast_pgd_switch(struct kvm_vcpu *vcpu, gpa_t new_pgd, */ if (mmu->shadow_root_level >= PT64_ROOT_4LEVEL && mmu->root_level >= PT64_ROOT_4LEVEL) - return !mmu_check_root(vcpu, new_pgd >> PAGE_SHIFT) && - cached_root_available(vcpu, new_pgd, new_role); + return cached_root_available(vcpu, new_pgd, new_role); return false; } |