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Re: [Qemu-devel] [PATCH 2/2 v2] pcie_aer: clear cmask for Advanced Error
From: |
Jason Baron |
Subject: |
Re: [Qemu-devel] [PATCH 2/2 v2] pcie_aer: clear cmask for Advanced Error Interrupt Message Number |
Date: |
Tue, 4 Sep 2012 16:22:46 -0400 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
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:
---
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 <address@hidden>
---
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
- Re: [Qemu-devel] [PATCH 2/2 v2] pcie_aer: clear cmask for Advanced Error Interrupt Message Number,
Jason Baron <=