From: Sean Christopherson <seanjc@google.com>
To: Jim Mattson <jmattson@google.com>
Cc: kvm list <kvm@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH 07/12] KVM: nVMX: Disable vmcs02 posted interrupts if vmcs12 PID isn't mappable
Date: Tue, 25 May 2021 00:57:35 +0000 [thread overview]
Message-ID: <YKxLf8546GQ6ZEQd@google.com> (raw)
In-Reply-To: <CALMp9eSae040kCsHApTdTgh0wKYiB9kRzgsyQVU7p_FaqwXwGg@mail.gmail.com>
On Mon, May 24, 2021, Jim Mattson wrote:
> On Mon, May 24, 2021 at 5:11 PM Sean Christopherson <seanjc@google.com> wrote:
> >
> > Can we instead word it along the lines of:
> >
> > Defer the KVM_INTERNAL_EXIT until KVM actually attempts to consume the posted
> > interrupt descriptor on behalf of the vCPU. Note, KVM may process posted
> > interrupts when it architecturally should not. Bugs aside, userspace can at
> > least rely on KVM to not process posted interrupts if there is no (posted?)
> > interrupt activity whatsoever.
>
> How about:
>
> Defer the KVM_INTERNAL_EXIT until KVM tries to access the contents of
> the VMCS12 posted interrupt descriptor. (Note that KVM may do this
> when it should not, per the architectural specification.)
Works for me!
next prev parent reply other threads:[~2021-05-25 0:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-20 23:03 [PATCH 00/12] KVM: nVMX: Fix vmcs02 PID use-after-free issue Jim Mattson
2021-05-20 23:03 ` [PATCH 01/12] KVM: x86: Remove guest mode check from kvm_check_nested_events Jim Mattson
2021-05-20 23:03 ` [PATCH 02/12] KVM: x86: Wake up a vCPU when kvm_check_nested_events fails Jim Mattson
2021-05-24 15:43 ` Paolo Bonzini
2021-05-24 16:39 ` Jim Mattson
2021-05-24 16:43 ` Paolo Bonzini
2021-05-24 17:10 ` Jim Mattson
2021-05-24 23:10 ` Sean Christopherson
2021-05-24 23:23 ` Jim Mattson
2021-05-24 23:24 ` Sean Christopherson
2021-05-24 23:29 ` Jim Mattson
2021-05-24 23:34 ` Sean Christopherson
2021-05-20 23:03 ` [PATCH 03/12] KVM: nVMX: Add a return code to vmx_complete_nested_posted_interrupt Jim Mattson
2021-05-20 23:03 ` [PATCH 04/12] KVM: x86: Add a return code to inject_pending_event Jim Mattson
2021-05-20 23:03 ` [PATCH 05/12] KVM: x86: Add a return code to kvm_apic_accept_events Jim Mattson
2021-05-25 19:24 ` Reiji Watanabe
2021-05-25 20:35 ` Jim Mattson
2021-05-20 23:03 ` [PATCH 06/12] KVM: nVMX: Fail on MMIO completion for nested posted interrupts Jim Mattson
2021-05-20 23:03 ` [PATCH 07/12] KVM: nVMX: Disable vmcs02 posted interrupts if vmcs12 PID isn't mappable Jim Mattson
2021-05-24 23:21 ` Sean Christopherson
2021-05-24 23:27 ` Jim Mattson
2021-05-24 23:45 ` Sean Christopherson
2021-05-25 0:03 ` Jim Mattson
2021-05-25 0:11 ` Sean Christopherson
2021-05-25 0:15 ` Jim Mattson
2021-05-25 0:57 ` Sean Christopherson [this message]
2021-05-20 23:03 ` [PATCH 08/12] KVM: selftests: Move APIC definitions into a separate file Jim Mattson
2021-05-20 23:03 ` [PATCH 09/12] KVM: selftests: Hoist APIC functions out of individual tests Jim Mattson
2021-05-20 23:03 ` [PATCH 10/12] KVM: selftests: Introduce x2APIC register manipulation functions Jim Mattson
2021-05-20 23:03 ` [PATCH 11/12] KVM: selftests: Introduce prepare_tpr_shadow Jim Mattson
2021-05-20 23:03 ` [PATCH 12/12] KVM: selftests: Add a test of an unbacked nested PI descriptor Jim Mattson
2021-05-21 0:58 ` [PATCH 00/12] KVM: nVMX: Fix vmcs02 PID use-after-free issue Sean Christopherson
2021-05-21 12:04 ` Jim Mattson
2021-05-24 15:50 ` Paolo Bonzini
2021-05-24 16:46 ` Paolo Bonzini
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