On Tue, Sep 04, 2012 at 04:22:46PM -0400, Jason Baron wrote:
> On Fri, Aug 31, 2012 at 11:43:31AM -0400, Jason Baron wrote:
> > On Fri, Aug 31, 2012 at 06:35:13PM +0300, Michael S. Tsirkin wrote:
> > > On Fri, Aug 31, 2012 at 10:45:52AM -0400, Jason Baron wrote:
> > > > On Fri, Aug 31, 2012 at 11:42:27AM +0300, Michael S. Tsirkin wrote:
> > > > > Some minor nits below. If you dont get to it I will tweak this patch
> > > > > when I apply it early next week.
> > > > >
> > > > > On Thu, Aug 30, 2012 at 01:51:15PM -0400, Jason Baron wrote:
> > > > > > The Advanced Error Interrupt Message Number (bits 31:27 of the Root
> > > > > > Error Status Register) is updated when the number of msi messages
> > > > > > assigned to a
> > > > > > device changes. Migration of windows 7 on q35 chipset failed
> > > > > > because the check
> > > > > > in get_pci_config_device() fails due to wmask being set on these
> > > > > > bits.
> > > > >
> > > > > I think you actually mean 'not being set on these bits'?
> > > > >
> > > >
> > > > No, the check is:
> > > >
> > > > static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
> > > > {
> > > > PCIDevice *s = container_of(pv, PCIDevice, config);
> > > > uint8_t *config;
> > > > int i;
> > > >
> > > > assert(size == pci_config_size(s));
> > > > config = g_malloc(size);
> > > >
> > > > qemu_get_buffer(f, config, size);
> > > > for (i = 0; i < size; ++i) {
> > > > if ((config[i] ^ s->config[i]) &
> > > > s->cmask[i] & ~s->wmask[i] & ~s->w1cmask[i]) {
> > > > g_free(config);
> > > > return -EINVAL;
> > > > }
> > > > }
> > > > .....
> > > >
> > > > So because cmask is set and these bits differ in config space (due to
> > > > them being updated before migration), the migration aborts.
> > >
> > > Ah so you mean 'cmask being set' - not wmask as you wrote.
> > >
> >
> > Sorry - my mistake, yes I meant 'cmask'. I will fix the changelog in the
> > re-post.
> >
>
> Ok, here's a v2:
>
> ---
>
Just a small request: in the future please do not put --- before patch
please: git am ignores everything after ---. I fixed this up manually.
> pcie_aer: clear cmask for Advanced Error Interrupt Message Number
>
> The Advanced Error Interrupt Message Number (bits 31:27 of the Root
> Error Status Register) is updated when the number of msi messages assigned to
> a
> device changes. Migration of windows 7 on q35 chipset failed because the check
> in get_pci_config_device() fails due to cmask being set on these bits. Its
> valid
> to update these bits and we must restore this state across migration.
>
> Signed-off-by: Jason Baron <jba...@redhat.com>
> ---
>
> v2:
> - Based on Michael Tsirkin's feedback:
> -updated changelog 'wmask' -> 'cmask'
> -Cleaned up comments
> -Make cmask set more readable
>
> hw/pcie_aer.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/hw/pcie_aer.c b/hw/pcie_aer.c
> index 3b6981c..b04c164 100644
> --- a/hw/pcie_aer.c
> +++ b/hw/pcie_aer.c
> @@ -738,6 +738,11 @@ void pcie_aer_root_init(PCIDevice *dev)
> PCI_ERR_ROOT_CMD_EN_MASK);
> pci_set_long(dev->w1cmask + pos + PCI_ERR_ROOT_STATUS,
> PCI_ERR_ROOT_STATUS_REPORT_MASK);
> + /* PCI_ERR_ROOT_IRQ is RO but devices change it using a
> + * device-specific method.
> + */
> + pci_set_long(dev->cmask + pos + PCI_ERR_ROOT_STATUS,
> + ~PCI_ERR_ROOT_IRQ);
> }
>
> void pcie_aer_root_reset(PCIDevice *dev)
> --
> 1.7.1
