diff options
| author | Lai Jiangshan <laijs@linux.alibaba.com> | 2021-10-19 19:01:54 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-22 05:44:43 -0400 |
| commit | 61b05a9fd4aec2dff0bbdf9d16ee000b24b33f41 (patch) | |
| tree | 62324710cacf6fecbc17aa06853bcd82c5d47c4e /arch/x86/kvm/mmu | |
| parent | 264d3dc1d3dca13b7eaf0c4fa7a4b2c91a5e056a (diff) | |
KVM: X86: Don't unload MMU in kvm_vcpu_flush_tlb_guest()
kvm_mmu_unload() destroys all the PGD caches. Use the lighter
kvm_mmu_sync_roots() and kvm_mmu_sync_prev_roots() instead.
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211019110154.4091-5-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index cb7622e93419..28d06180079d 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3647,6 +3647,9 @@ static bool is_unsync_root(hpa_t root) { struct kvm_mmu_page *sp; + if (!VALID_PAGE(root)) + return false; + /* * The read barrier orders the CPU's read of SPTE.W during the page table * walk before the reads of sp->unsync/sp->unsync_children here. @@ -3714,6 +3717,19 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) write_unlock(&vcpu->kvm->mmu_lock); } +void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu) +{ + unsigned long roots_to_free = 0; + int i; + + for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) + if (is_unsync_root(vcpu->arch.mmu->prev_roots[i].hpa)) + roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); + + /* sync prev_roots by simply freeing them */ + kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, roots_to_free); +} + static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gpa_t vaddr, u32 access, struct x86_exception *exception) { |