From: Paolo Bonzini <pbonzini@redhat.com>
To: lantianyu1986@gmail.com
Cc: Lan Tianyu <Tianyu.Lan@microsoft.com>,
rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com,
hpa@zytor.com, x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, michael.h.kelley@microsoft.com,
kys@microsoft.com, vkuznets@redhat.com
Subject: Re: [PATCH V4 14/15] KVM/VMX: Change hv flush logic when ept tables are mismatched.
Date: Mon, 15 Oct 2018 13:15:45 +0200 [thread overview]
Message-ID: <829117f9-350e-239b-f9f5-da5b7f33a5dd@redhat.com> (raw)
In-Reply-To: <20181013145406.4911-15-Tianyu.Lan@microsoft.com>
On 13/10/2018 16:54, lantianyu1986@gmail.com wrote:
> From: Lan Tianyu <Tianyu.Lan@microsoft.com>
>
> If ept table pointers are mismatched, flushing tlb for each vcpus via
> hv flush interface still helps to reduce vmexits which are triggered
> by IPI and INEPT emulation.
>
> Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
> ---
> arch/x86/kvm/vmx.c | 15 ++++++++-------
> 1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 6f44d3a63434..8ff13f3aed11 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -1571,7 +1571,8 @@ static void check_ept_pointer_match(struct kvm *kvm)
>
> static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
> {
> - int ret;
> + struct kvm_vcpu *vcpu;
> + int ret = -ENOTSUPP, i;
>
> spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
>
> @@ -1579,14 +1580,14 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
> check_ept_pointer_match(kvm);
>
> if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
> - ret = -ENOTSUPP;
> - goto out;
> + kvm_for_each_vcpu(i, vcpu, kvm)
> + ret |= hyperv_flush_guest_mapping(
> + to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
> + } else {
> + ret = hyperv_flush_guest_mapping(
> + to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
> }
>
> - ret = hyperv_flush_guest_mapping(
> - to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
> -
> -out:
> spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
> return ret;
> }
>
I think this is an independent change that can be applied separately?
Thanks,
Paolo
next prev parent reply other threads:[~2018-10-15 11:16 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-13 14:53 [PATCH V4 00/15] x86/KVM/Hyper-v: Add HV ept tlb range flush hypercall support in KVM lantianyu1986
2018-10-13 14:53 ` [PATCH V4 1/15] KVM: Add tlb_remote_flush_with_range callback in kvm_x86_ops lantianyu1986
2018-10-13 14:53 ` [PATCH V4 2/15] KVM/MMU: Add tlb flush with range helper function lantianyu1986
2018-10-14 7:26 ` Liran Alon
2018-10-14 8:16 ` Thomas Gleixner
2018-10-14 9:20 ` Liran Alon
2018-10-14 12:57 ` Tianyu Lan
2018-10-14 9:27 ` Russell King - ARM Linux
2018-10-14 9:35 ` Russell King - ARM Linux
2018-10-14 13:21 ` Tianyu Lan
2018-10-14 13:33 ` Russell King - ARM Linux
2018-10-15 12:02 ` Paolo Bonzini
2018-10-13 14:53 ` [PATCH V4 3/15] KVM: Replace old tlb flush function with new one to flush a specified range lantianyu1986
2018-10-13 14:53 ` [PATCH V4 4/15] KVM: Make kvm_set_spte_hva() return int lantianyu1986
2018-10-13 14:53 ` [PATCH V4 5/15] KVM/MMU: Move tlb flush in kvm_set_pte_rmapp() to kvm_mmu_notifier_change_pte() lantianyu1986
2018-10-13 14:53 ` [PATCH V4 6/15] KVM/MMU: Flush tlb directly in the kvm_set_pte_rmapp() lantianyu1986
2018-10-15 11:52 ` Paolo Bonzini
2018-10-13 14:53 ` [PATCH V4 7/15] KVM/MMU: Flush tlb directly in the kvm_zap_gfn_range() lantianyu1986
2018-10-15 10:04 ` Paolo Bonzini
2018-10-15 13:08 ` Tianyu Lan
2018-10-13 14:53 ` [PATCH V4 8/15] KVM/MMU: Flush tlb directly in kvm_mmu_zap_collapsible_spte() lantianyu1986
2018-10-13 14:54 ` [PATCH V4 9/15] KVM: Add flush_link and parent_pte in the struct kvm_mmu_page lantianyu1986
2018-10-15 10:12 ` Paolo Bonzini
2018-10-13 14:54 ` [PATCH V4 10/15] KVM: Add spte's point " lantianyu1986
2018-10-13 14:54 ` [PATCH V4 11/15] KVM/MMU: Replace tlb flush function with range list flush function lantianyu1986
2018-10-15 11:51 ` Paolo Bonzini
2018-10-13 14:54 ` [PATCH V4 12/15] x86/hyper-v: Add HvFlushGuestAddressList hypercall support lantianyu1986
2018-10-15 10:30 ` Paolo Bonzini
2018-10-13 14:54 ` [PATCH V4 13/15] x86/Hyper-v: Add trace in the hyperv_nested_flush_guest_mapping_range() lantianyu1986
2018-10-13 14:54 ` [PATCH V4 14/15] KVM/VMX: Change hv flush logic when ept tables are mismatched lantianyu1986
2018-10-15 11:15 ` Paolo Bonzini [this message]
2018-10-13 14:54 ` [PATCH V4 15/15] KVM/VMX: Add hv tlb range flush support lantianyu1986
2018-10-15 12:04 ` [PATCH V4 00/15] x86/KVM/Hyper-v: Add HV ept tlb range flush hypercall support in KVM Paolo Bonzini
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