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hw/xen: detect when running inside stubdomain

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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>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <e66aa97dca5120f22e015c19710b2ff04f525720.1711506237.git-series.marmarek@invisiblethingslab.com>
Signed-off-by: Anthony PERARD <anthony@xenproject.org>
This commit is contained in:
Marek Marczykowski-Górecki 2024-03-27 04:05:14 +01:00 committed by Anthony PERARD
parent b6d32a06fc
commit b2bbadc63c
3 changed files with 24 additions and 0 deletions
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22
hw/i386/xen/xen-hvm.c
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@ -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);

1
include/hw/xen/xen.h
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@ -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);

1
system/globals.c
View File

@ -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;