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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] xen-hvm: stop faking I/O to access PCI config space
This patch removes the current hackery where IOREQ_TYPE_PCI_CONFIG
requests are handled by faking PIO to 0xcf8 and 0xcfc and replaces it
with direct calls to pci_host_config_read/write_common().
Doing so necessitates mapping BDFs to PCIDevices but maintaining a simple
QLIST in xen_device_realize/unrealize() will suffice.
NOTE: whilst config space accesses are currently limited to
PCI_CONFIG_SPACE_SIZE, this patch paves the way to increasing the
limit to PCIE_CONFIG_SPACE_SIZE when Xen gains the ability to
emulate MCFG table accesses.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
--
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Marcel Apfelbaum <marcel@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Eduardo Habkost <ehabkost@xxxxxxxxxx>
Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>
v2:
- Introduce a helper function rw_config_req_item() to handle config
register offset calculation
- Handle req->count > 1 more like MMIO rather than PIO
- Added Roger to cc list (not taking R-b because of significant change)
---
hw/i386/xen/trace-events | 2 +
hw/i386/xen/xen-hvm.c | 120 +++++++++++++++++++++++++++++++++++++++--------
2 files changed, 102 insertions(+), 20 deletions(-)
diff --git a/hw/i386/xen/trace-events b/hw/i386/xen/trace-events
index 8dab7bc..f576f1b 100644
--- a/hw/i386/xen/trace-events
+++ b/hw/i386/xen/trace-events
@@ -15,6 +15,8 @@ cpu_ioreq_pio(void *req, uint32_t dir, uint32_t df, uint32_t
data_is_ptr, uint64
cpu_ioreq_pio_read_reg(void *req, uint64_t data, uint64_t addr, uint32_t size)
"I/O=%p pio read reg data=0x%"PRIx64" port=0x%"PRIx64" size=%d"
cpu_ioreq_pio_write_reg(void *req, uint64_t data, uint64_t addr, uint32_t
size) "I/O=%p pio write reg data=0x%"PRIx64" port=0x%"PRIx64" size=%d"
cpu_ioreq_move(void *req, uint32_t dir, uint32_t df, uint32_t data_is_ptr,
uint64_t addr, uint64_t data, uint32_t count, uint32_t size) "I/O=%p copy
dir=%d df=%d ptr=%d port=0x%"PRIx64" data=0x%"PRIx64" count=%d size=%d"
+cpu_ioreq_config_read(void *req, uint32_t sbdf, uint32_t reg, uint32_t size,
uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
+cpu_ioreq_config_write(void *req, uint32_t sbdf, uint32_t reg, uint32_t size,
uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
# xen-mapcache.c
xen_map_cache(uint64_t phys_addr) "want 0x%"PRIx64
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index caa563b..d79b1d6 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -12,6 +12,7 @@
#include "cpu.h"
#include "hw/pci/pci.h"
+#include "hw/pci/pci_host.h"
#include "hw/i386/pc.h"
#include "hw/i386/apic-msidef.h"
#include "hw/xen/xen_common.h"
@@ -86,6 +87,12 @@ typedef struct XenPhysmap {
QLIST_ENTRY(XenPhysmap) list;
} XenPhysmap;
+typedef struct XenPciDevice {
+ PCIDevice *pci_dev;
+ uint32_t sbdf;
+ QLIST_ENTRY(XenPciDevice) entry;
+} XenPciDevice;
+
typedef struct XenIOState {
ioservid_t ioservid;
shared_iopage_t *shared_page;
@@ -105,6 +112,7 @@ typedef struct XenIOState {
struct xs_handle *xenstore;
MemoryListener memory_listener;
MemoryListener io_listener;
+ QLIST_HEAD(, XenPciDevice) dev_list;
DeviceListener device_listener;
QLIST_HEAD(, XenPhysmap) physmap;
hwaddr free_phys_offset;
@@ -569,6 +577,12 @@ static void xen_device_realize(DeviceListener *listener,
if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
PCIDevice *pci_dev = PCI_DEVICE(dev);
+ XenPciDevice *xendev = g_new(XenPciDevice, 1);
+
+ xendev->pci_dev = pci_dev;
+ xendev->sbdf = PCI_BUILD_BDF(pci_dev_bus_num(pci_dev),
+ pci_dev->devfn);
+ QLIST_INSERT_HEAD(&state->dev_list, xendev, entry);
xen_map_pcidev(xen_domid, state->ioservid, pci_dev);
}
@@ -581,8 +595,17 @@ static void xen_device_unrealize(DeviceListener *listener,
if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
PCIDevice *pci_dev = PCI_DEVICE(dev);
+ XenPciDevice *xendev, *next;
xen_unmap_pcidev(xen_domid, state->ioservid, pci_dev);
+
+ QLIST_FOREACH_SAFE(xendev, &state->dev_list, entry, next) {
+ if (xendev->pci_dev == pci_dev) {
+ QLIST_REMOVE(xendev, entry);
+ g_free(xendev);
+ break;
+ }
+ }
}
}
@@ -903,6 +926,80 @@ static void cpu_ioreq_move(ioreq_t *req)
}
}
+static void rw_config_req_item(XenPciDevice *xendev, ioreq_t *req,
+ uint32_t i, uint32_t *val)
+{
+ int32_t reg = req->addr;
+ uint32_t offset = req->size * i;
+
+ reg += (req->df ? -1 : 1) * offset;
+ if (reg < 0 || reg > PCI_CONFIG_SPACE_SIZE) {
+ if (req->dir == IOREQ_READ) {
+ *val = ~0u;
+ }
+ return;
+ }
+
+ if (req->dir == IOREQ_READ) {
+ *val = pci_host_config_read_common(xendev->pci_dev, reg,
+ PCI_CONFIG_SPACE_SIZE,
+ req->size);
+ trace_cpu_ioreq_config_read(req, xendev->sbdf, reg,
+ req->size, *val);
+ } else {
+ trace_cpu_ioreq_config_write(req, xendev->sbdf, reg, req->size,
+ *val);
+ pci_host_config_write_common(xendev->pci_dev, reg,
+ PCI_CONFIG_SPACE_SIZE, *val,
+ req->size);
+ }
+}
+
+static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
+{
+ uint32_t sbdf = req->addr >> 32;
+ XenPciDevice *xendev;
+
+ if (req->size > sizeof(uint32_t)) {
+ hw_error("PCI config access: bad size (%u)", req->size);
+ }
+
+ QLIST_FOREACH(xendev, &state->dev_list, entry) {
+ unsigned int i;
+ uint32_t tmp;
+
+ if (xendev->sbdf != sbdf) {
+ continue;
+ }
+
+ if (!req->data_is_ptr) {
+ if (req->dir == IOREQ_READ) {
+ for (i = 0; i < req->count; i++) {
+ rw_config_req_item(xendev, req, i, &tmp);
+ req->data = tmp;
+ }
+ } else if (req->dir == IOREQ_WRITE) {
+ for (i = 0; i < req->count; i++) {
+ tmp = req->data;
+ rw_config_req_item(xendev, req, i, &tmp);
+ }
+ }
+ } else {
+ if (req->dir == IOREQ_READ) {
+ for (i = 0; i < req->count; i++) {
+ rw_config_req_item(xendev, req, i, &tmp);
+ write_phys_req_item(req->data, req, i, &tmp);
+ }
+ } else if (req->dir == IOREQ_WRITE) {
+ for (i = 0; i < req->count; i++) {
+ read_phys_req_item(req->data, req, i, &tmp);
+ rw_config_req_item(xendev, req, i, &tmp);
+ }
+ }
+ }
+ }
+}
+
static void regs_to_cpu(vmware_regs_t *vmport_regs, ioreq_t *req)
{
X86CPU *cpu;
@@ -975,27 +1072,9 @@ static void handle_ioreq(XenIOState *state, ioreq_t *req)
case IOREQ_TYPE_INVALIDATE:
xen_invalidate_map_cache();
break;
- case IOREQ_TYPE_PCI_CONFIG: {
- uint32_t sbdf = req->addr >> 32;
- uint32_t val;
-
- /* Fake a write to port 0xCF8 so that
- * the config space access will target the
- * correct device model.
- */
- val = (1u << 31) |
- ((req->addr & 0x0f00) << 16) |
- ((sbdf & 0xffff) << 8) |
- (req->addr & 0xfc);
- do_outp(0xcf8, 4, val);
-
- /* Now issue the config space access via
- * port 0xCFC
- */
- req->addr = 0xcfc | (req->addr & 0x03);
- cpu_ioreq_pio(req);
+ case IOREQ_TYPE_PCI_CONFIG:
+ cpu_ioreq_config(state, req);
break;
- }
default:
hw_error("Invalid ioreq type 0x%x\n", req->type);
}
@@ -1366,6 +1445,7 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion
**ram_memory)
memory_listener_register(&state->io_listener, &address_space_io);
state->device_listener = xen_device_listener;
+ QLIST_INIT(&state->dev_list);
device_listener_register(&state->device_listener);
/* Initialize backend core & drivers */
--
2.1.4
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