linux-kernel - Re: [PATCH v2] KVM: arm64: Get rid of userspace_irqchip_in

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Message-ID: <173040458509.3411583.4399376120814266828.b4-ty@linux.dev>
Date: Thu, 31 Oct 2024 19:56:28 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Marc Zyngier <maz@...nel.org>,
	Raghavendra Rao Ananta <rananta@...gle.com>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	stable@...r.kernel.org,
	kvm@...r.kernel.org,
	syzbot <syzkaller@...glegroups.com>
Subject: Re: [PATCH v2] KVM: arm64: Get rid of userspace_irqchip_in_use

On Mon, 28 Oct 2024 23:45:33 +0000, Raghavendra Rao Ananta wrote:
> Improper use of userspace_irqchip_in_use led to syzbot hitting the
> following WARN_ON() in kvm_timer_update_irq():
> 
> WARNING: CPU: 0 PID: 3281 at arch/arm64/kvm/arch_timer.c:459
> kvm_timer_update_irq+0x21c/0x394
> Call trace:
>   kvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459
>   kvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968
>   kvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264
>   kvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [inline]
>   kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [inline]
>   kvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695
>   kvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658
>   vfs_ioctl fs/ioctl.c:51 [inline]
>   __do_sys_ioctl fs/ioctl.c:907 [inline]
>   __se_sys_ioctl fs/ioctl.c:893 [inline]
>   __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893
>   __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
>   invoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49
>   el0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132
>   do_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151
>   el0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712
>   el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
>   el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
> 
> [...]

Applied to kvmarm/next, thanks!

[1/1] KVM: arm64: Get rid of userspace_irqchip_in_use
      https://git.kernel.org/kvmarm/kvmarm/c/e571ebcff926

--
Best,
Oliver