From: Paolo Bonzini <pbonzini@redhat.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/10] KVM: x86: Move "flush guest's TLB" logic to separate kvm_x86_ops hook
Date: Fri, 21 Feb 2020 18:31:06 +0100 [thread overview]
Message-ID: <cef77bcf-0921-a530-9745-7922e657b013@redhat.com> (raw)
In-Reply-To: <87tv3krqta.fsf@vitty.brq.redhat.com>
On 21/02/20 14:52, Vitaly Kuznetsov wrote:
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index fbabb2f06273..72f7ca4baa6d 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -2675,7 +2675,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
>> trace_kvm_pv_tlb_flush(vcpu->vcpu_id,
>> st->preempted & KVM_VCPU_FLUSH_TLB);
>> if (xchg(&st->preempted, 0) & KVM_VCPU_FLUSH_TLB)
>> - kvm_vcpu_flush_tlb(vcpu, false);
>> + kvm_x86_ops->tlb_flush_guest(vcpu);
>>
>> vcpu->arch.st.preempted = 0;
> There is one additional place in hyperv.c where we do TLB flush on
> behalf of the guest, kvm_hv_flush_tlb(). Currently, it does
> KVM_REQ_TLB_FLUSH (resulting in kvm_x86_ops->tlb_flush()), do we need
> something like KVM_REQ_TLB_FLUSH_GUEST instead?
Yes, that would be better since INVEPT does not flush linear mappings.
So, when EPT and VPID is enabled, KVM_REQ_TLB_FLUSH would not flush the
guest's translations.
Paolo
next prev parent reply other threads:[~2020-02-21 17:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 20:43 [PATCH 00/10] KVM: x86: Clean up VMX's TLB flushing code Sean Christopherson
2020-02-20 20:43 ` [PATCH 01/10] KVM: VMX: Use vpid_sync_context() directly when possible Sean Christopherson
2020-02-21 13:17 ` Vitaly Kuznetsov
2020-02-21 15:36 ` Sean Christopherson
2020-02-21 17:26 ` Paolo Bonzini
2020-02-20 20:43 ` [PATCH 02/10] KVM: VMX: Move vpid_sync_vcpu_addr() down a few lines Sean Christopherson
2020-02-21 13:19 ` Vitaly Kuznetsov
2020-02-20 20:43 ` [PATCH 03/10] KVM: VMX: Handle INVVPID fallback logic in vpid_sync_vcpu_addr() Sean Christopherson
2020-02-21 13:26 ` Vitaly Kuznetsov
2020-02-20 20:43 ` [PATCH 04/10] KVM: VMX: Fold vpid_sync_vcpu_{single,global}() into vpid_sync_context() Sean Christopherson
2020-02-21 13:39 ` Vitaly Kuznetsov
2020-02-21 15:32 ` Sean Christopherson
2020-02-21 17:28 ` Paolo Bonzini
2020-02-20 20:43 ` [PATCH 05/10] KVM: nVMX: Use vpid_sync_vcpu_addr() to emulate INVVPID with address Sean Christopherson
2020-02-21 13:43 ` Vitaly Kuznetsov
2020-02-20 20:43 ` [PATCH 06/10] KVM: x86: Move "flush guest's TLB" logic to separate kvm_x86_ops hook Sean Christopherson
[not found] ` <87tv3krqta.fsf@vitty.brq.redhat.com>
2020-02-21 17:31 ` Paolo Bonzini [this message]
2020-02-21 17:32 ` Paolo Bonzini
2020-02-20 20:43 ` [PATCH 07/10] KVM: VMX: Clean up vmx_flush_tlb_gva() Sean Christopherson
2020-02-21 13:54 ` Vitaly Kuznetsov
2020-02-20 20:43 ` [PATCH 08/10] KVM: x86: Drop @invalidate_gpa param from kvm_x86_ops' tlb_flush() Sean Christopherson
2020-02-21 13:56 ` Vitaly Kuznetsov
2020-02-20 20:43 ` [PATCH 09/10] KVM: VMX: Drop @invalidate_gpa from __vmx_flush_tlb() Sean Christopherson
2020-02-20 20:43 ` [PATCH 10/10] KVM: VMX: Fold __vmx_flush_tlb() into vmx_flush_tlb() Sean Christopherson
2020-02-21 13:20 ` [PATCH 00/10] KVM: x86: Clean up VMX's TLB flushing code Paolo Bonzini
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