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xen: fix build without pci passthrough

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Xen PCI passthrough support may not be available and thus the global
variable "has_igd_gfx_passthru" might be compiled out. Common code
should not access it in that case.

Unfortunately, we can't use CONFIG_XEN_PCI_PASSTHROUGH directly in
xen-common.c so this patch instead move access to the
has_igd_gfx_passthru variable via function and those functions are
also implemented as stubs. The stubs will be used when QEMU is built
without passthrough support.

Now, when one will want to enable igd-passthru via the -machine
property, they will get an error message if QEMU is built without
passthrough support.

Fixes: 46472d8232 ('xen: convert "-machine igd-passthru" to an accelerator property')
Reported-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20200603160442.3151170-1-anthony.perard@citrix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Anthony PERARD 2020-06-03 17:04:42 +01:00 • committed by Paolo Bonzini
parent e77cb0bb20
commit acd0c9416d
7 changed files with 43 additions and 8 deletions
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4
accel/xen/xen-all.c
View file

@ -137,12 +137,12 @@ static void xen_change_state_handler(void *opaque, int running,
static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
{
return has_igd_gfx_passthru;
return xen_igd_gfx_pt_enabled();
}
static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
{
has_igd_gfx_passthru = value;
xen_igd_gfx_pt_set(value, errp);
}
static void xen_setup_post(MachineState *ms, AccelState *accel)