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KVM: X86: Skip allocating pae_root for vcpu->arch.guest_mmu when !tdp_enabled

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It is never used.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211118110814.2568-11-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lai Jiangshan 2021-11-18 19:08:09 +08:00 • committed by Paolo Bonzini
parent 5835676710
commit 27f4fca29f
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/mmu/mmu.c
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@ -5514,6 +5514,10 @@ static int __kvm_mmu_create(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID; mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID;
/* vcpu->arch.guest_mmu isn't used when !tdp_enabled. */
if (!tdp_enabled && mmu == &vcpu->arch.guest_mmu)
return 0;
/* /*
* When using PAE paging, the four PDPTEs are treated as 'root' pages, * When using PAE paging, the four PDPTEs are treated as 'root' pages,
* while the PDP table is a per-vCPU construct that's allocated at MMU * while the PDP table is a per-vCPU construct that's allocated at MMU