From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33103) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOIOx-0000Cs-Qj for qemu-devel@nongnu.org; Mon, 11 Dec 2017 02:21:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOIOw-0003mV-Vk for qemu-devel@nongnu.org; Mon, 11 Dec 2017 02:21:23 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34320) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eOIOw-0003ls-Pa for qemu-devel@nongnu.org; Mon, 11 Dec 2017 02:21:22 -0500 From: Ladi Prosek Date: Mon, 11 Dec 2017 08:21:10 +0100 Message-Id: <20171211072110.9058-5-lprosek@redhat.com> In-Reply-To: <20171211072110.9058-1-lprosek@redhat.com> References: <20171211072110.9058-1-lprosek@redhat.com> Subject: [Qemu-devel] [PATCH v4 4/4] ivshmem: Disable irqfd on device reset List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, armbru@redhat.com, marcandre.lureau@redhat.com, geoff@hostfission.com, eblake@redhat.com The effects of ivshmem_enable_irqfd() was not undone on device reset. This manifested as: ivshmem_add_kvm_msi_virq: Assertion `!s->msi_vectors[vector].pdev' failed. when irqfd was enabled before reset and then enabled again after reset, making ivshmem_enable_irqfd() run for the second time. To reproduce, run: ivshmem-server and QEMU with: -device ivshmem-doorbell,chardev=iv -chardev socket,path=/tmp/ivshmem_socket,id=iv then install the Windows driver, at the time of writing available at: https://github.com/virtio-win/kvm-guest-drivers-windows/tree/master/ivshmem and crash-reboot the guest by inducing a BSOD. Signed-off-by: Ladi Prosek --- hw/misc/ivshmem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index d1bb246d12..9c7e74ef12 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -758,10 +758,14 @@ static void ivshmem_msix_vector_use(IVShmemState *s) } } +static void ivshmem_disable_irqfd(IVShmemState *s); + static void ivshmem_reset(DeviceState *d) { IVShmemState *s = IVSHMEM_COMMON(d); + ivshmem_disable_irqfd(s); + s->intrstatus = 0; s->intrmask = 0; if (ivshmem_has_feature(s, IVSHMEM_MSI)) { -- 2.13.6