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vfio: add pcie extended capability support 

For vfio pcie device, we could expose the extended capability on
PCIE bus. due to add a new pcie capability at the tail of the chain,
in order to avoid config space overwritten, we introduce a copy config
for parsing extended caps. and rebuild the pcie extended config space.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Chen Fan 2016-06-30 13:00:23 -06:00 committed by Alex Williamson
parent 4d3fc4fdc6
commit 325ae8d548
1 changed files with 71 additions and 1 deletions
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72
hw/vfio/pci.c
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@ -1502,6 +1502,21 @@ static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
return next - pos;
}
static uint16_t vfio_ext_cap_max_size(const uint8_t *config, uint16_t pos)
{
uint16_t tmp, next = PCIE_CONFIG_SPACE_SIZE;
for (tmp = PCI_CONFIG_SPACE_SIZE; tmp;
tmp = PCI_EXT_CAP_NEXT(pci_get_long(config + tmp))) {
if (tmp > pos && tmp < next) {
next = tmp;
}
}
return next - pos;
}
static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask)
{
pci_set_word(buf, (pci_get_word(buf) & ~mask) | val);
@ -1749,16 +1764,71 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos)
return 0;
}
static int vfio_add_ext_cap(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
uint32_t header;
uint16_t cap_id, next, size;
uint8_t cap_ver;
uint8_t *config;
/*
* pcie_add_capability always inserts the new capability at the tail
* of the chain. Therefore to end up with a chain that matches the
* physical device, we cache the config space to avoid overwriting
* the original config space when we parse the extended capabilities.
*/
config = g_memdup(pdev->config, vdev->config_size);
for (next = PCI_CONFIG_SPACE_SIZE; next;
next = PCI_EXT_CAP_NEXT(pci_get_long(config + next))) {
header = pci_get_long(config + next);
cap_id = PCI_EXT_CAP_ID(header);
cap_ver = PCI_EXT_CAP_VER(header);
/*
* If it becomes important to configure extended capabilities to their
* actual size, use this as the default when it's something we don't
* recognize. Since QEMU doesn't actually handle many of the config
* accesses, exact size doesn't seem worthwhile.
*/
size = vfio_ext_cap_max_size(config, next);
pcie_add_capability(pdev, cap_id, cap_ver, next, size);
pci_set_long(pdev->config + next, PCI_EXT_CAP(cap_id, cap_ver, 0));
/* Use emulated next pointer to allow dropping extended caps */
pci_long_test_and_set_mask(vdev->emulated_config_bits + next,
PCI_EXT_CAP_NEXT_MASK);
}
g_free(config);
return 0;
}
static int vfio_add_capabilities(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
int ret;
if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
!pdev->config[PCI_CAPABILITY_LIST]) {
return 0; /* Nothing to add */
}
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
ret = vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
if (ret) {
return ret;
}
/* on PCI bus, it doesn't make sense to expose extended capabilities. */
if (!pci_is_express(pdev) ||
!pci_bus_is_express(pdev->bus) ||
!pci_get_long(pdev->config + PCI_CONFIG_SPACE_SIZE)) {
return 0;
}
return vfio_add_ext_cap(vdev);
}
static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)