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Re: [Qemu-devel] [PATCH for v1.0 1/3] msix: track function masked in pci
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH for v1.0 1/3] msix: track function masked in pci device state |
Date: |
Sun, 04 Dec 2011 13:35:03 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-12-04 11:20, Michael S. Tsirkin wrote:
> On Fri, Dec 02, 2011 at 04:34:21PM -0700, Cam Macdonell wrote:
>> Based on a git bisect, this patch breaks msi-x interrupt delivery in
>> the ivshmem device.
>
> I think the following should fix it. Compiled-only -
> could you pls check? If yes let's apply to the stable branch.
>
> -->
>
> ivshmem: add missing msix calls
>
> ivshmem used msix but didn't call it on either reset or
> config write paths. This used to partically work since
> guests don't use all of msi-x configuration fields,
> and reset is rarely used, but the patch 'msix: track function masked
> in pci device state' broke that. Fix by adding appropriate calls.
>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> --
>
> diff --git a/hw/ivshmem.c b/hw/ivshmem.c
> index 242fbea..3680c0f 100644
> --- a/hw/ivshmem.c
> +++ b/hw/ivshmem.c
> @@ -505,6 +505,7 @@ static void ivshmem_reset(DeviceState *d)
> IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
>
> s->intrstatus = 0;
> + msix_reset(&s->dev);
> return;
> }
>
> @@ -610,6 +611,13 @@ static int ivshmem_load(QEMUFile* f, void *opaque, int
> version_id)
> return 0;
> }
>
> +static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
> + uint32_t val, int len)
> +{
> + pci_default_write_config(pci_dev, address, val, len);
> + msix_write_config(pci_dev, address, val, len);
> +}
> +
> static int pci_ivshmem_init(PCIDevice *dev)
> {
> IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
> @@ -734,6 +742,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
>
> }
>
> + s->dev.config_write = ivshmem_write_config;
> +
> return 0;
> }
>
>
>
But please fix this for real and merge [1]&[2] (with depending patches)
into master. The above is just boilerplate code from device POV.
Jan
[1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/80240
[2] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/80244
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