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| author | Tianyu Lan | 2018-07-24 10:17:07 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2018-08-06 17:59:18 +0200 |
| commit | c2a4eadf7747a1359a80ede64e4ae0e0ba64ca08 (patch) | |
| tree | 51601589f99be2c26d1d2e4e5b0cf64831456fcc /arch/x86/kvm/mmu.c | |
| parent | KVM: vmx: skip VMWRITE of HOST_{FS,GS}_BASE when possible (diff) | |
| download | kernel-qcow2-linux-c2a4eadf7747a1359a80ede64e4ae0e0ba64ca08.tar.gz kernel-qcow2-linux-c2a4eadf7747a1359a80ede64e4ae0e0ba64ca08.tar.xz kernel-qcow2-linux-c2a4eadf7747a1359a80ede64e4ae0e0ba64ca08.zip | |
KVM/MMU: Combine flushing remote tlb in mmu_set_spte()
mmu_set_spte() flushes remote tlbs for drop_parent_pte/drop_spte()
and set_spte() separately. This may introduce redundant flush. This
patch is to combine these flushes and check flush request after
calling set_spte().
Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Reviewed-by: Junaid Shahid <junaids@google.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 22a7984c68a5..8f216321d33b 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2901,6 +2901,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access, int rmap_count; int set_spte_ret; int ret = RET_PF_RETRY; + bool flush = false; pgprintk("%s: spte %llx write_fault %d gfn %llx\n", __func__, *sptep, write_fault, gfn); @@ -2917,12 +2918,12 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access, child = page_header(pte & PT64_BASE_ADDR_MASK); drop_parent_pte(child, sptep); - kvm_flush_remote_tlbs(vcpu->kvm); + flush = true; } else if (pfn != spte_to_pfn(*sptep)) { pgprintk("hfn old %llx new %llx\n", spte_to_pfn(*sptep), pfn); drop_spte(vcpu->kvm, sptep); - kvm_flush_remote_tlbs(vcpu->kvm); + flush = true; } else was_rmapped = 1; } @@ -2934,7 +2935,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access, ret = RET_PF_EMULATE; kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); } - if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH) + if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush) kvm_flush_remote_tlbs(vcpu->kvm); if (unlikely(is_mmio_spte(*sptep))) |