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ivshmem: Disable irqfd on device reset

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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 <lprosek@redhat.com>
Message-Id: <20171211072110.9058-5-lprosek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ladi Prosek 2017-12-11 08:21:10 +01:00 committed by Paolo Bonzini
parent 0b88dd9420
commit a40227911c
1 changed files with 4 additions and 0 deletions
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4
hw/misc/ivshmem.c
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@ -757,10 +757,14 @@ 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)) {