[PATCHv2 02/13] qemu: capability bits in pci save/restore

Michael S. Tsirkin
2009-06-02T15:05:45Z

Add support for capability bits in save/restore for pci.
These will be used for MSI, where the capability might
be present or not as requested by user, which does not
map well into a single version number.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
hw/pci.c | 14 ++++++++++++--
hw/pci.h | 4 ++++
2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 1e70e46..5dcfb4e 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -127,12 +127,15 @@ int pci_bus_num(PCIBus *s)

void pci_device_save(PCIDevice *s, QEMUFile *f)
{
+ int version = s->cap_present ? 3 : 2;
int i;

- qemu_put_be32(f, 2); /* PCI device version */
+ qemu_put_be32(f, version); /* PCI device version */
qemu_put_buffer(f, s->config, 256);
for (i = 0; i < 4; i++)
qemu_put_be32(f, s->irq_state[i]);
+ if (version >= 3)
+ qemu_put_be32(f, s->cap_present);
}

int pci_device_load(PCIDevice *s, QEMUFile *f)
@@ -141,7 +144,7 @@ int pci_device_load(PCIDevice *s, QEMUFile *f)
int i;

version_id = qemu_get_be32(f);
- if (version_id > 2)
+ if (version_id > 3)
return -EINVAL;
qemu_get_buffer(f, s->config, 256);
pci_update_mappings(s);
@@ -149,6 +152,13 @@ int pci_device_load(PCIDevice *s, QEMUFile *f)
if (version_id >= 2)
for (i = 0; i < 4; i ++)
s->irq_state[i] = qemu_get_be32(f);
+ if (version_id >= 3)
+ s->cap_present = qemu_get_be32(f);
+ else
+ s->cap_present = 0;
+
+ if (s->cap_present & ~s->cap_supported)
+ return -EINVAL;

return 0;
}
diff --git a/hw/pci.h b/hw/pci.h
index c0c2380..9139504 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -178,6 +178,10 @@ struct PCIDevice {

/* Current IRQ levels. Used internally by the generic PCI code. */
int irq_state[4];
+
+ /* Capability bits for save/load */
+ uint32_t cap_supported;
+ uint32_t cap_present;
};

PCIDevice *pci_register_device(PCIBus *bus, const char *name,
--
1.6.3.1.56.g79e1.dirty