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/x86.c | |
| 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/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9d25ef7d4d53..3a74540caca2 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3245,15 +3245,14 @@ static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu) ++vcpu->stat.tlb_flush; if (!tdp_enabled) { - /* + /* * A TLB flush on behalf of the guest is equivalent to * INVPCID(all), toggling CR4.PGE, etc., which requires - * a forced sync of the shadow page tables. Unload the - * entire MMU here and the subsequent load will sync the - * shadow page tables, and also flush the TLB. + * a forced sync of the shadow page tables. Ensure all the + * roots are synced and the guest TLB in hardware is clean. */ - kvm_mmu_unload(vcpu); - return; + kvm_mmu_sync_roots(vcpu); + kvm_mmu_sync_prev_roots(vcpu); } static_call(kvm_x86_tlb_flush_guest)(vcpu); |