From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Maxim Levitsky <mlevitsk@redhat.com>,
kvm@vger.kernel.org, Vitaly Kuznetsov <vkuznets@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Joerg Roedel <joro@8bytes.org>, Jim Mattson <jmattson@google.com>
Subject: Re: [PATCH v2 2/4] KVM: nSVM: correctly restore nested_run_pending on migration
Date: Thu, 7 Jan 2021 22:05:29 +0100 [thread overview]
Message-ID: <2885afd8-7f1f-f797-ce05-a85550039dc5@redhat.com> (raw)
In-Reply-To: <X/ds0sUw/me4e/g1@google.com>
On 07/01/21 21:19, Sean Christopherson wrote:
>> That said, the v1 change had some appeal to it.
>
> Which v1 change are you referring to?
Moving the to-be-injected event from eventinj to vcpu->arch, and from
there to vmcb02 on the next vmentry's inject_pending_event.
>> In the VMX case (if properly implemented) it would allow removing the weird
>> nested_run_pending case from prepare_vmcs02_early. I think it's a valuable
>> invariant that there are no events in the VMCS after each KVM_RUN iteration,
>> and this special case is breaking the invariant.
>
> Hmm, as weird as that code is, I think it's actually the most architecturally
> correct behavior.
I was referring to the "then" branch therein. :)
Paolo
next prev parent reply other threads:[~2021-01-07 21:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 9:38 [PATCH v2 0/4] KVM: nSVM: few random fixes Maxim Levitsky
2021-01-07 9:38 ` [PATCH v2 1/4] KVM: nSVM: cancel KVM_REQ_GET_NESTED_STATE_PAGES on nested vmexit Maxim Levitsky
2021-01-07 17:00 ` Sean Christopherson
2021-01-07 17:51 ` Paolo Bonzini
2021-01-07 17:59 ` Paolo Bonzini
2021-01-07 18:03 ` Maxim Levitsky
2021-01-07 19:12 ` Sean Christopherson
2021-01-07 9:38 ` [PATCH v2 2/4] KVM: nSVM: correctly restore nested_run_pending on migration Maxim Levitsky
2021-01-07 18:03 ` Paolo Bonzini
2021-01-07 20:19 ` Sean Christopherson
2021-01-07 21:05 ` Paolo Bonzini [this message]
2021-01-07 9:38 ` [PATCH v2 3/4] KVM: nSVM: always leave the nested state first on KVM_SET_NESTED_STATE Maxim Levitsky
2021-01-07 9:38 ` [PATCH v2 4/4] KVM: nSVM: mark vmcb as dirty when forcingly leaving the guest mode Maxim Levitsky
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