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From: Sean Christopherson <seanjc@google.com>
To: Jim Mattson <jmattson@google.com>
Cc: kvm@vger.kernel.org, pbonzini@redhat.com
Subject: Re: [PATCH 00/12] KVM: nVMX: Fix vmcs02 PID use-after-free issue
Date: Fri, 21 May 2021 00:58:30 +0000	[thread overview]
Message-ID: <YKcFtmEIdxMjw+G3@google.com> (raw)
In-Reply-To: <20210520230339.267445-1-jmattson@google.com>

On Thu, May 20, 2021, Jim Mattson wrote:
> Initially, I added a new kvm request for a userspace exit on the next guest
> entry, but Sean hated that approach.

Hey!  You could at least say _why_ I hated it. :-D

My argument is that the only way to guarantee that vcpu->run->exit_reason isn't
crushed between making the request and servicing the request is by guaranteeing
that KVM makes it back to the run loop immediately after making the request.
Since the only way to accomplish that is by forcing a return up the stack, at
that point we can simply return the "request" directly.

  parent reply	other threads:[~2021-05-21  0:58 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
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 ` Sean Christopherson [this message]
2021-05-21 12:04 ` [PATCH 00/12] KVM: nVMX: Fix vmcs02 PID use-after-free issue Jim Mattson
2021-05-24 15:50 ` Paolo Bonzini
2021-05-24 16:46 ` Paolo Bonzini

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