aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--hw/i386/xen/xen-hvm.c22
-rw-r--r--hw/xen/xen-host-pci-device.c76
-rw-r--r--hw/xen/xen-host-pci-device.h6
-rw-r--r--hw/xen/xen-hvm-common.c26
-rw-r--r--include/hw/xen/xen.h1
-rw-r--r--system/globals.c1
6 files changed, 122 insertions, 10 deletions
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 006d219ad5..4f6446600c 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -584,6 +584,26 @@ static void xen_wakeup_notifier(Notifier *notifier, void *data)
xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 0);
}
+static bool xen_check_stubdomain(struct xs_handle *xsh)
+{
+ char *dm_path = g_strdup_printf(
+ "/local/domain/%d/image/device-model-domid", xen_domid);
+ char *val;
+ int32_t dm_domid;
+ bool is_stubdom = false;
+
+ val = xs_read(xsh, 0, dm_path, NULL);
+ if (val) {
+ if (sscanf(val, "%d", &dm_domid) == 1) {
+ is_stubdom = dm_domid != 0;
+ }
+ free(val);
+ }
+
+ g_free(dm_path);
+ return is_stubdom;
+}
+
void xen_hvm_init_pc(PCMachineState *pcms, MemoryRegion **ram_memory)
{
MachineState *ms = MACHINE(pcms);
@@ -596,6 +616,8 @@ void xen_hvm_init_pc(PCMachineState *pcms, MemoryRegion **ram_memory)
xen_register_ioreq(state, max_cpus, &xen_memory_listener);
+ xen_is_stubdomain = xen_check_stubdomain(state->xenstore);
+
QLIST_INIT(&xen_physmap);
xen_read_physmap(state);
diff --git a/hw/xen/xen-host-pci-device.c b/hw/xen/xen-host-pci-device.c
index 8c6e9a1716..eaf32f2710 100644
--- a/hw/xen/xen-host-pci-device.c
+++ b/hw/xen/xen-host-pci-device.c
@@ -9,6 +9,8 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
+#include "hw/xen/xen-legacy-backend.h"
+#include "hw/xen/xen-bus-helper.h"
#include "xen-host-pci-device.h"
#define XEN_HOST_PCI_MAX_EXT_CAP \
@@ -33,13 +35,73 @@
#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
#define IORESOURCE_MEM_64 0x00100000
+/*
+ * Non-passthrough (dom0) accesses are local PCI devices and use the given BDF
+ * Passthough (stubdom) accesses are through PV frontend PCI device. Those
+ * either have a BDF identical to the backend's BDF (xen-backend.passthrough=1)
+ * or a local virtual BDF (xen-backend.passthrough=0)
+ *
+ * We are always given the backend's BDF and need to lookup the appropriate
+ * local BDF for sysfs access.
+ */
+static void xen_host_pci_fill_local_addr(XenHostPCIDevice *d, Error **errp)
+{
+ unsigned int num_devs, len, i;
+ unsigned int domain, bus, dev, func;
+ char *be_path = NULL;
+ char path[16];
+
+ be_path = qemu_xen_xs_read(xenstore, 0, "device/pci/0/backend", &len);
+ if (!be_path) {
+ error_setg(errp, "Failed to read device/pci/0/backend");
+ goto out;
+ }
+
+ if (xs_node_scanf(xenstore, 0, be_path, "num_devs", NULL,
+ "%d", &num_devs) != 1) {
+ error_setg(errp, "Failed to read or parse %s/num_devs", be_path);
+ goto out;
+ }
+
+ for (i = 0; i < num_devs; i++) {
+ snprintf(path, sizeof(path), "dev-%d", i);
+ if (xs_node_scanf(xenstore, 0, be_path, path, NULL,
+ "%x:%x:%x.%x", &domain, &bus, &dev, &func) != 4) {
+ error_setg(errp, "Failed to read or parse %s/%s", be_path, path);
+ goto out;
+ }
+ if (domain != d->domain ||
+ bus != d->bus ||
+ dev != d->dev ||
+ func != d->func)
+ continue;
+ snprintf(path, sizeof(path), "vdev-%d", i);
+ if (xs_node_scanf(xenstore, 0, be_path, path, NULL,
+ "%x:%x:%x.%x", &domain, &bus, &dev, &func) != 4) {
+ error_setg(errp, "Failed to read or parse %s/%s", be_path, path);
+ goto out;
+ }
+ d->local_domain = domain;
+ d->local_bus = bus;
+ d->local_dev = dev;
+ d->local_func = func;
+ goto out;
+ }
+ error_setg(errp, "Failed to find PCI device %x:%x:%x.%x in xenstore",
+ d->domain, d->bus, d->dev, d->func);
+
+out:
+ free(be_path);
+}
+
static void xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
const char *name, char *buf, ssize_t size)
{
int rc;
rc = snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
- d->domain, d->bus, d->dev, d->func, name);
+ d->local_domain, d->local_bus, d->local_dev, d->local_func,
+ name);
assert(rc >= 0 && rc < size);
}
@@ -342,6 +404,18 @@ void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
d->dev = dev;
d->func = func;
+ if (xen_is_stubdomain) {
+ xen_host_pci_fill_local_addr(d, errp);
+ if (*errp) {
+ goto error;
+ }
+ } else {
+ d->local_domain = d->domain;
+ d->local_bus = d->bus;
+ d->local_dev = d->dev;
+ d->local_func = d->func;
+ }
+
xen_host_pci_config_open(d, errp);
if (*errp) {
goto error;
diff --git a/hw/xen/xen-host-pci-device.h b/hw/xen/xen-host-pci-device.h
index 4d8d34ecb0..270dcb27f7 100644
--- a/hw/xen/xen-host-pci-device.h
+++ b/hw/xen/xen-host-pci-device.h
@@ -23,6 +23,12 @@ typedef struct XenHostPCIDevice {
uint8_t dev;
uint8_t func;
+ /* different from the above in case of stubdomain */
+ uint16_t local_domain;
+ uint8_t local_bus;
+ uint8_t local_dev;
+ uint8_t local_func;
+
uint16_t vendor_id;
uint16_t device_id;
uint32_t class_code;
diff --git a/hw/xen/xen-hvm-common.c b/hw/xen/xen-hvm-common.c
index b8ace1c368..3a9d6f981b 100644
--- a/hw/xen/xen-hvm-common.c
+++ b/hw/xen/xen-hvm-common.c
@@ -475,11 +475,11 @@ static void handle_ioreq(XenIOState *state, ioreq_t *req)
}
}
-static bool handle_buffered_iopage(XenIOState *state)
+static unsigned int handle_buffered_iopage(XenIOState *state)
{
buffered_iopage_t *buf_page = state->buffered_io_page;
buf_ioreq_t *buf_req = NULL;
- bool handled_ioreq = false;
+ unsigned int handled = 0;
ioreq_t req;
int qw;
@@ -492,7 +492,7 @@ static bool handle_buffered_iopage(XenIOState *state)
req.count = 1;
req.dir = IOREQ_WRITE;
- for (;;) {
+ do {
uint32_t rdptr = buf_page->read_pointer, wrptr;
xen_rmb();
@@ -533,22 +533,30 @@ static bool handle_buffered_iopage(XenIOState *state)
assert(!req.data_is_ptr);
qatomic_add(&buf_page->read_pointer, qw + 1);
- handled_ioreq = true;
- }
+ handled += qw + 1;
+ } while (handled < IOREQ_BUFFER_SLOT_NUM);
- return handled_ioreq;
+ return handled;
}
static void handle_buffered_io(void *opaque)
{
+ unsigned int handled;
XenIOState *state = opaque;
- if (handle_buffered_iopage(state)) {
+ handled = handle_buffered_iopage(state);
+ if (handled >= IOREQ_BUFFER_SLOT_NUM) {
+ /* We handled a full page of ioreqs. Schedule a timer to continue
+ * processing while giving other stuff a chance to run.
+ */
timer_mod(state->buffered_io_timer,
- BUFFER_IO_MAX_DELAY + qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
- } else {
+ qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
+ } else if (handled == 0) {
timer_del(state->buffered_io_timer);
qemu_xen_evtchn_unmask(state->xce_handle, state->bufioreq_local_port);
+ } else {
+ timer_mod(state->buffered_io_timer,
+ BUFFER_IO_MAX_DELAY + qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
}
}
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 37ecc91fc3..ecb89ecfc1 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -36,6 +36,7 @@ enum xen_mode {
extern uint32_t xen_domid;
extern enum xen_mode xen_mode;
extern bool xen_domid_restrict;
+extern bool xen_is_stubdomain;
int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
int xen_set_pci_link_route(uint8_t link, uint8_t irq);
diff --git a/system/globals.c b/system/globals.c
index e353584201..d602a04fa2 100644
--- a/system/globals.c
+++ b/system/globals.c
@@ -60,6 +60,7 @@ bool qemu_uuid_set;
uint32_t xen_domid;
enum xen_mode xen_mode = XEN_DISABLED;
bool xen_domid_restrict;
+bool xen_is_stubdomain;
struct evtchn_backend_ops *xen_evtchn_ops;
struct gnttab_backend_ops *xen_gnttab_ops;
struct foreignmem_backend_ops *xen_foreignmem_ops;
generated by cgit v1.2.3 (git 2.26.2) at 2025-03-22 12:33:04 +0000