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From: Sean Christopherson via Linux-kernel-mentees <linux-kernel-mentees@lists.linuxfoundation.org>
To: Coleman Dietsch <dietschc@csp.edu>
Cc: x86@kernel.org, kvm@vger.kernel.org,
	Pavel Skripkin <paskripkin@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ
Date: Tue, 9 Aug 2022 00:34:24 +0000	[thread overview]
Message-ID: <YvGrkII3Sgw/qTeo@google.com> (raw)
In-Reply-To: <20220808190607.323899-3-dietschc@csp.edu>

On Mon, Aug 08, 2022, Coleman Dietsch wrote:
> Stop Xen timer (if it's running) prior to changing the IRQ vector and
> potentially (re)starting the timer. Changing the IRQ vector while the
> timer is still running can result in KVM injecting a garbage event, e.g.
> vm_xen_inject_timer_irqs() could see a non-zero xen.timer_pending from
> a previous timer but inject the new xen.timer_virq.
> 
> Fixes: 536395260582 ("KVM: x86/xen: handle PV timers oneshot mode")
> Cc: stable@vger.kernel.org
> Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42
> Reported-by: syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com
> Signed-off-by: Coleman Dietsch <dietschc@csp.edu>
> ---

Reviewed-by: Sean Christopherson <seanjc@google.com>
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WARNING: multiple messages have this Message-ID (diff)
From: Sean Christopherson <seanjc@google.com>
To: Coleman Dietsch <dietschc@csp.edu>
Cc: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org, skhan@linuxfoundation.org,
	Pavel Skripkin <paskripkin@gmail.com>,
	linux-kernel-mentees@lists.linuxfoundation.org,
	stable@vger.kernel.org,
	syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com
Subject: Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ
Date: Tue, 9 Aug 2022 00:34:24 +0000	[thread overview]
Message-ID: <YvGrkII3Sgw/qTeo@google.com> (raw)
In-Reply-To: <20220808190607.323899-3-dietschc@csp.edu>

On Mon, Aug 08, 2022, Coleman Dietsch wrote:
> Stop Xen timer (if it's running) prior to changing the IRQ vector and
> potentially (re)starting the timer. Changing the IRQ vector while the
> timer is still running can result in KVM injecting a garbage event, e.g.
> vm_xen_inject_timer_irqs() could see a non-zero xen.timer_pending from
> a previous timer but inject the new xen.timer_virq.
> 
> Fixes: 536395260582 ("KVM: x86/xen: handle PV timers oneshot mode")
> Cc: stable@vger.kernel.org
> Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42
> Reported-by: syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com
> Signed-off-by: Coleman Dietsch <dietschc@csp.edu>
> ---

Reviewed-by: Sean Christopherson <seanjc@google.com>

  reply	other threads:[~2022-08-09  0:34 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-08 19:06 [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once Coleman Dietsch
2022-08-08 19:06 ` Coleman Dietsch
2022-08-08 19:06 ` [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ Coleman Dietsch
2022-08-08 19:06   ` Coleman Dietsch
2022-08-09  0:34   ` Sean Christopherson via Linux-kernel-mentees [this message]
2022-08-09  0:34     ` Sean Christopherson
2022-08-09  9:22   ` David Woodhouse
2022-08-09  9:22     ` David Woodhouse
2022-08-09 12:59     ` Paolo Bonzini
2022-08-09 12:59       ` Paolo Bonzini
2022-08-09 13:51       ` David Woodhouse
2022-08-09 13:51         ` David Woodhouse
2022-08-09 14:07         ` Sean Christopherson via Linux-kernel-mentees
2022-08-09 14:07           ` Sean Christopherson
2022-08-09 14:16           ` David Woodhouse
2022-08-09 14:16             ` David Woodhouse
2022-08-09 14:31             ` Paolo Bonzini
2022-08-09 14:31               ` Paolo Bonzini
2022-08-09 14:36               ` David Woodhouse
2022-08-09 14:36                 ` David Woodhouse
2022-08-09 14:40               ` Sean Christopherson via Linux-kernel-mentees
2022-08-09 14:40                 ` Sean Christopherson
2022-08-09 14:52                 ` David Woodhouse
2022-08-09 14:52                   ` David Woodhouse
2022-08-09  0:32 ` [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once Sean Christopherson via Linux-kernel-mentees
2022-08-09  0:32   ` Sean Christopherson
2022-08-09 12:59   ` Paolo Bonzini
2022-08-09 12:59     ` Paolo Bonzini
  -- strict thread matches above, loose matches on Subject: below --
2022-08-08 19:02 [PATCH v3 0/2] KVM: x86/xen: Prevent Xen timer init when running Coleman Dietsch
2022-08-08 19:02 ` [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ Coleman Dietsch

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