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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC PATCH 22/30] xen/pt: add support for PCIe Extended Capabilities and larger config space
This patch provides basic facilities for PCIe Extended Capabilities and
support for controlled (via s->pcie_enabled_dev flag) access to PCIe
config space (>256).
PCIe Extended Capabilities make use of 16-bit capability ID. Also,
a capability size might exceed 8-bit width. So as the very first step
we need to increase type size for grp_id, grp_size, etc -- they were
limited to 8-bit.
The only troublesome issue with PCIe Extended Capability IDs is that their
value range is actually same as for basic PCI capabilities.
Eg. capability ID 3 means VPD Capability for PCI and at the same time
Device Serial Number Capability for PCIe Extended caps. This adds a bit of
inconvenience.
In order to distinguish between two sets of same capability IDs, the patch
introduces a set of macros to mark a capability ID as PCIe Extended one
(or check if it is basic/extended + get a raw ID value):
- PCIE_EXT_CAP_ID(cap_id)
- IS_PCIE_EXT_CAP_ID(grp_id)
- GET_PCIE_EXT_CAP_ID(grp_id)
Here is how it's used:
/* Intel IGD Opregion group */
{
.grp_id = XEN_PCI_INTEL_OPREGION, /* no change */
.grp_type = XEN_PT_GRP_TYPE_EMU,
.grp_size = 0x4,
.size_init = xen_pt_reg_grp_size_init,
.emu_regs = xen_pt_emu_reg_igd_opregion,
},
/* Vendor-specific Extended Capability reg group */
{
.grp_id = PCIE_EXT_CAP_ID(PCI_EXT_CAP_ID_VNDR),
.grp_type = XEN_PT_GRP_TYPE_EMU,
.grp_size = 0xFF,
.size_init = xen_pt_ext_cap_vendor_size_init,
.emu_regs = xen_pt_ext_cap_emu_reg_vendor,
},
By using the PCIE_EXT_CAP_ID() macro it is possible to reuse existing
header files with already defined PCIe Extended Capability ID values.
find_cap_offset() receive capabily ID and checks if it's an Extended one
by using IS_PCIE_EXT_CAP_ID(cap) macro, passing the real capabiliy
ID value to either xen_host_pci_find_next_ext_cap
or xen_host_pci_find_next_cap.
Signed-off-by: Alexey Gerasimenko <x1917x@xxxxxxxxx>
---
hw/xen/xen_pt.c | 14 +++++-
hw/xen/xen_pt.h | 13 +++--
hw/xen/xen_pt_config_init.c | 113 +++++++++++++++++++++-----------------------
3 files changed, 74 insertions(+), 66 deletions(-)
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index a902a9b685..bf098c26b3 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -82,10 +82,20 @@ void xen_pt_log(const PCIDevice *d, const char *f, ...)
/* Config Space */
-static int xen_pt_pci_config_access_check(PCIDevice *d, uint32_t addr, int len)
+static int xen_pt_pci_config_access_check(PCIDevice *d,
+ uint32_t addr, int len)
{
+ XenPCIPassthroughState *s = XEN_PT_DEVICE(d);
+
/* check offset range */
- if (addr > 0xFF) {
+ if (s->pcie_enabled_dev) {
+ if (addr >= PCIE_CONFIG_SPACE_SIZE) {
+ XEN_PT_ERR(d, "Failed to access register with offset "
+ "exceeding 0xFFF. (addr: 0x%02x, len: %d)\n",
+ addr, len);
+ return -1;
+ }
+ } else if (addr >= PCI_CONFIG_SPACE_SIZE) {
XEN_PT_ERR(d, "Failed to access register with offset exceeding 0xFF. "
"(addr: 0x%02x, len: %d)\n", addr, len);
return -1;
diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h
index 1204acbdce..5531347ab2 100644
--- a/hw/xen/xen_pt.h
+++ b/hw/xen/xen_pt.h
@@ -31,6 +31,11 @@ void xen_pt_log(const PCIDevice *d, const char *f, ...)
GCC_FMT_ATTR(2, 3);
/* Helper */
#define XEN_PFN(x) ((x) >> XC_PAGE_SHIFT)
+/* Macro's for PCIe Extended Capabilities */
+#define PCIE_EXT_CAP_ID(cap_id) ((cap_id) | (1U << 16))
+#define IS_PCIE_EXT_CAP_ID(grp_id) ((grp_id) & (1U << 16))
+#define GET_PCIE_EXT_CAP_ID(grp_id) ((grp_id) & 0xFFFF)
+
typedef const struct XenPTRegInfo XenPTRegInfo;
typedef struct XenPTReg XenPTReg;
@@ -152,13 +157,13 @@ typedef const struct XenPTRegGroupInfo XenPTRegGroupInfo;
/* emul reg group size initialize method */
typedef int (*xen_pt_reg_size_init_fn)
(XenPCIPassthroughState *, XenPTRegGroupInfo *,
- uint32_t base_offset, uint8_t *size);
+ uint32_t base_offset, uint32_t *size);
/* emulated register group information */
struct XenPTRegGroupInfo {
- uint8_t grp_id;
+ uint32_t grp_id;
XenPTRegisterGroupType grp_type;
- uint8_t grp_size;
+ uint32_t grp_size;
xen_pt_reg_size_init_fn size_init;
XenPTRegInfo *emu_regs;
};
@@ -168,7 +173,7 @@ typedef struct XenPTRegGroup {
QLIST_ENTRY(XenPTRegGroup) entries;
XenPTRegGroupInfo *reg_grp;
uint32_t base_offset;
- uint8_t size;
+ uint32_t size;
QLIST_HEAD(, XenPTReg) reg_tbl_list;
} XenPTRegGroup;
diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index 91de215407..9c041fa288 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -32,29 +32,42 @@ static int xen_pt_ptr_reg_init(XenPCIPassthroughState *s,
XenPTRegInfo *reg,
/* helper */
/* A return value of 1 means the capability should NOT be exposed to guest. */
-static int xen_pt_hide_dev_cap(const XenHostPCIDevice *d, uint8_t grp_id)
+static int xen_pt_hide_dev_cap(const XenHostPCIDevice *d, uint32_t grp_id)
{
- switch (grp_id) {
- case PCI_CAP_ID_EXP:
- /* The PCI Express Capability Structure of the VF of Intel 82599 10GbE
- * Controller looks trivial, e.g., the PCI Express Capabilities
- * Register is 0. We should not try to expose it to guest.
- *
- * The datasheet is available at
- *
http://download.intel.com/design/network/datashts/82599_datasheet.pdf
- *
- * See 'Table 9.7. VF PCIe Configuration Space' of the datasheet, the
- * PCI Express Capability Structure of the VF of Intel 82599 10GbE
- * Controller looks trivial, e.g., the PCI Express Capabilities
- * Register is 0, so the Capability Version is 0 and
- * xen_pt_pcie_size_init() would fail.
- */
- if (d->vendor_id == PCI_VENDOR_ID_INTEL &&
- d->device_id == PCI_DEVICE_ID_INTEL_82599_SFP_VF) {
- return 1;
+ if (IS_PCIE_EXT_CAP_ID(grp_id)) {
+ switch (GET_PCIE_EXT_CAP_ID(grp_id)) {
+ /* Here can be added device-specific filtering
+ * for PCIe Extended capabilities (those with offset >= 0x100).
+ * This is simply a placeholder as no filtering needed for now.
+ */
+ default:
+ break;
+ }
+ } else {
+ /* basic PCI capability */
+ switch (grp_id) {
+ case PCI_CAP_ID_EXP:
+ /* The PCI Express Capability Structure of the VF of Intel 82599
10GbE
+ * Controller looks trivial, e.g., the PCI Express Capabilities
+ * Register is 0. We should not try to expose it to guest.
+ *
+ * The datasheet is available at
+ *
http://download.intel.com/design/network/datashts/82599_datasheet.pdf
+ *
+ * See 'Table 9.7. VF PCIe Configuration Space' of the datasheet,
the
+ * PCI Express Capability Structure of the VF of Intel 82599 10GbE
+ * Controller looks trivial, e.g., the PCI Express Capabilities
+ * Register is 0, so the Capability Version is 0 and
+ * xen_pt_pcie_size_init() would fail.
+ */
+ if (d->vendor_id == PCI_VENDOR_ID_INTEL &&
+ d->device_id == PCI_DEVICE_ID_INTEL_82599_SFP_VF) {
+ return 1;
+ }
+ break;
}
- break;
}
+
return 0;
}
@@ -1622,7 +1635,7 @@ static XenPTRegInfo xen_pt_emu_reg_igd_opregion[] = {
static int xen_pt_reg_grp_size_init(XenPCIPassthroughState *s,
const XenPTRegGroupInfo *grp_reg,
- uint32_t base_offset, uint8_t *size)
+ uint32_t base_offset, uint32_t *size)
{
*size = grp_reg->grp_size;
return 0;
@@ -1630,14 +1643,18 @@ static int
xen_pt_reg_grp_size_init(XenPCIPassthroughState *s,
/* get Vendor Specific Capability Structure register group size */
static int xen_pt_vendor_size_init(XenPCIPassthroughState *s,
const XenPTRegGroupInfo *grp_reg,
- uint32_t base_offset, uint8_t *size)
+ uint32_t base_offset, uint32_t *size)
{
- return xen_host_pci_get_byte(&s->real_device, base_offset + 0x02, size);
+ uint8_t sz = 0;
+ int ret = xen_host_pci_get_byte(&s->real_device, base_offset + 0x02, &sz);
+
+ *size = sz;
+ return ret;
}
/* get PCI Express Capability Structure register group size */
static int xen_pt_pcie_size_init(XenPCIPassthroughState *s,
const XenPTRegGroupInfo *grp_reg,
- uint32_t base_offset, uint8_t *size)
+ uint32_t base_offset, uint32_t *size)
{
PCIDevice *d = &s->dev;
uint8_t version = get_pcie_capability_version(s);
@@ -1709,7 +1726,7 @@ static int xen_pt_pcie_size_init(XenPCIPassthroughState
*s,
/* get MSI Capability Structure register group size */
static int xen_pt_msi_size_init(XenPCIPassthroughState *s,
const XenPTRegGroupInfo *grp_reg,
- uint32_t base_offset, uint8_t *size)
+ uint32_t base_offset, uint32_t *size)
{
uint16_t msg_ctrl = 0;
uint8_t msi_size = 0xa;
@@ -1737,7 +1754,7 @@ static int xen_pt_msi_size_init(XenPCIPassthroughState *s,
/* get MSI-X Capability Structure register group size */
static int xen_pt_msix_size_init(XenPCIPassthroughState *s,
const XenPTRegGroupInfo *grp_reg,
- uint32_t base_offset, uint8_t *size)
+ uint32_t base_offset, uint32_t *size)
{
int rc = 0;
@@ -1920,44 +1937,20 @@ out:
* Main
*/
-static uint8_t find_cap_offset(XenPCIPassthroughState *s, uint8_t cap)
+static uint32_t find_cap_offset(XenPCIPassthroughState *s, uint32_t cap)
{
- uint8_t id;
- unsigned max_cap = XEN_PCI_CAP_MAX;
- uint8_t pos = PCI_CAPABILITY_LIST;
- uint8_t status = 0;
+ uint32_t retval = 0;
- if (xen_host_pci_get_byte(&s->real_device, PCI_STATUS, &status)) {
- return 0;
- }
- if ((status & PCI_STATUS_CAP_LIST) == 0) {
- return 0;
- }
-
- while (max_cap--) {
- if (xen_host_pci_get_byte(&s->real_device, pos, &pos)) {
- break;
- }
- if (pos < PCI_CONFIG_HEADER_SIZE) {
- break;
+ if (IS_PCIE_EXT_CAP_ID(cap)) {
+ if (s->pcie_enabled_dev) {
+ retval = xen_host_pci_find_next_ext_cap(&s->real_device, 0,
+ GET_PCIE_EXT_CAP_ID(cap));
}
-
- pos &= ~3;
- if (xen_host_pci_get_byte(&s->real_device,
- pos + PCI_CAP_LIST_ID, &id)) {
- break;
- }
-
- if (id == 0xff) {
- break;
- }
- if (id == cap) {
- return pos;
- }
-
- pos += PCI_CAP_LIST_NEXT;
+ } else {
+ retval = xen_host_pci_find_next_cap(&s->real_device, 0, cap);
}
- return 0;
+
+ return retval;
}
static void xen_pt_config_reg_init(XenPCIPassthroughState *s,
--
2.11.0
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