From 27f4fca29f9cfd740dcb7b2bc577bcfd02ae367d Mon Sep 17 00:00:00 2001 From: Lai Jiangshan Date: Thu, 18 Nov 2021 19:08:09 +0800 Subject: [PATCH] KVM: X86: Skip allocating pae_root for vcpu->arch.guest_mmu when !tdp_enabled It is never used. Signed-off-by: Lai Jiangshan Message-Id: <20211118110814.2568-11-jiangshanlai@gmail.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index ede6391..644a5cb 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -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++) 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, * while the PDP table is a per-vCPU construct that's allocated at MMU -- 2.7.4