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Re: [Qemu-devel] [PATCH 1/3] ivshmem: Don't update non-existent MSI rout
From: |
Marc-André Lureau |
Subject: |
Re: [Qemu-devel] [PATCH 1/3] ivshmem: Don't update non-existent MSI routes |
Date: |
Fri, 10 Nov 2017 13:10:46 -0500 (EST) |
----- Original Message -----
> As of commit 660c97eef6f8 ("ivshmem: use kvm irqfd for msi notifications"),
> QEMU crashes with:
>
> kvm_irqchip_commit_routes: Assertion `ret == 0' failed.
>
> if the ivshmem device is configured with more vectors than what the server
> supports. This is caused by the ivshmem_vector_unmask() being called on
> vectors that have not been initialized by ivshmem_add_kvm_msi_virq().
>
> This commit fixes it by adding a simple check to the mask and unmask
> callbacks.
>
> Note that the opposite mismatch, if the server supplies more vectors than
> what the device is configured for, is already handled and leads to output
> like:
>
> Too many eventfd received, device has 1 vectors
>
> Fixes: 660c97eef6f8 ("ivshmem: use kvm irqfd for msi notifications")
> Signed-off-by: Ladi Prosek <address@hidden>
Reviewed-by: Marc-André Lureau <address@hidden>
> ---
> hw/misc/ivshmem.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> index a5a46827fe..6e46669744 100644
> --- a/hw/misc/ivshmem.c
> +++ b/hw/misc/ivshmem.c
> @@ -317,6 +317,10 @@ static int ivshmem_vector_unmask(PCIDevice *dev,
> unsigned vector,
> int ret;
>
> IVSHMEM_DPRINTF("vector unmask %p %d\n", dev, vector);
> + if (!v->pdev) {
> + error_report("ivshmem: vector %d route does not exist", vector);
> + return -EINVAL;
> + }
>
> ret = kvm_irqchip_update_msi_route(kvm_state, v->virq, msg, dev);
> if (ret < 0) {
> @@ -331,12 +335,16 @@ static void ivshmem_vector_mask(PCIDevice *dev,
> unsigned vector)
> {
> IVShmemState *s = IVSHMEM_COMMON(dev);
> EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
> + MSIVector *v = &s->msi_vectors[vector];
> int ret;
>
> IVSHMEM_DPRINTF("vector mask %p %d\n", dev, vector);
> + if (!v->pdev) {
> + error_report("ivshmem: vector %d route does not exist", vector);
> + return;
> + }
>
> - ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n,
> -
> s->msi_vectors[vector].virq);
> + ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, v->virq);
> if (ret != 0) {
> error_report("remove_irqfd_notifier_gsi failed");
> }
> --
> 2.13.5
>
>