Mailing List Archive

Introduce global xen_is_stubdomain variable when qemu is running inside
a stubdomain instead of dom0. This will be relevant for subsequent
patches, as few things like accessing PCI config space need to be done
differently.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
Changes in v3:
- move to xen_hvm_init_pc()
- coding style
Changes in v2:
- use sigend int for domid to match xenstore_read_int() types
- fix code style
---
hw/i386/xen/xen-hvm.c | 22 ++++++++++++++++++++++
include/hw/xen/xen.h | 1 +
system/globals.c | 1 +
3 files changed, 24 insertions(+)

diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 7745cb3..3291c17 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -583,6 +583,26 @@ 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);
@@ -595,6 +615,8 @@ 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/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 37ecc91..ecb89ec 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 e353584..d602a04 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;
--
git-series 0.9.1