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[Qemu-devel] [RFC v7 06/11] vfio: add pcie extanded capability support
From: |
Chen Fan |
Subject: |
[Qemu-devel] [RFC v7 06/11] vfio: add pcie extanded capability support |
Date: |
Tue, 19 May 2015 12:42:48 +0800 |
For vfio pcie device, we could expose the extended capability on
PCIE bus. in order to avoid config space broken, we introduce
a copy config for parsing extended caps. and rebuild the pcie
extended config space.
Signed-off-by: Chen Fan <address@hidden>
---
hw/vfio/pci.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 72 insertions(+), 1 deletion(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index cc169ea..7a446b0 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2496,6 +2496,21 @@ 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 - 1;
+
+ 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);
@@ -2803,16 +2818,72 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev,
uint8_t pos)
return 0;
}
+static int vfio_add_ext_cap(VFIOPCIDevice *vdev, const uint8_t *config)
+{
+ PCIDevice *pdev = &vdev->pdev;
+ uint32_t header;
+ uint16_t cap_id, next, size;
+ uint8_t cap_ver;
+
+ 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);
+ if (next == PCI_CONFIG_SPACE_SIZE) {
+ /* Begin the rebuild, we should set the next offset zero. */
+ pci_set_long(pdev->config + next, PCI_EXT_CAP(cap_id, cap_ver, 0));
+ }
+
+ /* Use emulated header pointer to allow dropping extended caps */
+ pci_set_long(vdev->emulated_config_bits + next, 0xffffffff);
+ }
+
+ return 0;
+}
+
static int vfio_add_capabilities(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
+ int ret;
+ uint8_t *config;
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;
+ }
+
+ /*
+ * In order to avoid config space broken, here using a copy config to
+ * parse extended capabilities.
+ */
+ config = g_memdup(pdev->config, vdev->config_size);
+ ret = vfio_add_ext_cap(vdev, config);
+
+ g_free(config);
+ return ret;
}
static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
--
1.9.3
- [Qemu-devel] [RFC v7 02/11] vfio: squeeze out vfio_pci_do_hot_reset for support bus reset, (continued)
- [Qemu-devel] [RFC v7 03/11] qdev: add bus reset_notifiers callbacks for host bus reset, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 08/11] vfio: add aer support for vfio device, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 06/11] vfio: add pcie extanded capability support,
Chen Fan <=
- [Qemu-devel] [RFC v7 07/11] aer: impove pcie_aer_init to support vfio device, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 09/11] pcie_aer: expose pcie_aer_msg() interface, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 05/11] vfio: do hot bus reset when do virtual secondary bus reset, Chen Fan, 2015/05/19
[Qemu-devel] [RFC v7 10/11] vfio-pci: pass the aer error to guest, Chen Fan, 2015/05/19
[Qemu-devel] [RFC v7 11/11] vfio: add 'aer' property to expose aercap, Chen Fan, 2015/05/19