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KVM: X86: Calculate quadrant when !role.gpte_is_8_bytes

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role.quadrant is only valid when gpte size is 4 bytes and only be
calculated when gpte size is 4 bytes.

Although "vcpu->arch.mmu->root_level <= PT32_ROOT_LEVEL" also means
gpte size is 4 bytes, but using "!role.gpte_is_8_bytes" is clearer

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211118110814.2568-15-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lai Jiangshan 2021-11-18 19:08:13 +08:00 • committed by Paolo Bonzini
parent 41e35604ea
commit b46a13cb7e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/mmu.c
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@ -2087,7 +2087,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
role.level = level;
role.direct = direct;
role.access = access;
if (!direct_mmu && vcpu->arch.mmu->root_level <= PT32_ROOT_LEVEL) {
if (!direct_mmu && !role.gpte_is_8_bytes) {
quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant;