Commit 27f4fca2 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Paolo Bonzini
Browse files

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



It is never used.

Signed-off-by: default avatarLai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211118110814.2568-11-jiangshanlai@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 58356767

arch/x86/kvm/mmu/mmu.c

+4 −0
Original line number Diff line number Diff line
@@ -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