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From: Jim Mattson <jmattson@google.com>
To: Sean Christopherson <seanjc@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: Mon, 24 May 2021 17:15:49 -0700	[thread overview]
Message-ID: <CALMp9eSae040kCsHApTdTgh0wKYiB9kRzgsyQVU7p_FaqwXwGg@mail.gmail.com> (raw)
In-Reply-To: <YKxAsZzO1uQx7sf8@google.com>

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.)

  reply	other threads:[~2021-05-25  0:16 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 [this message]
2021-05-25  0:57               ` Sean Christopherson
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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