On 2015/1/20 16:14, Gerd Hoffmann wrote:
On Di, 2015-01-20 at 11:14 +0800, Chen, Tiejun wrote:
On 2015/1/19 19:45, Gerd Hoffmann wrote:
On Mo, 2015-01-19 at 17:28 +0800, Tiejun Chen wrote:
+DEF("gfx_passthru", 0, QEMU_OPTION_gfx_passthru,
+ "-gfx_passthru enable Intel IGD passthrough by XEN\n",
+ QEMU_ARCH_ALL)
+STEXI
+@item -gfx_passthru
+@findex -gfx_passthru
+Enable Intel IGD passthrough by XEN
+ETEXI
Make that a machine option, i.e. "-machine pc,igd-passthru=on"?
Yeah but I think we need "-machine xenfv,igd-passthru=on" here.
IIRC xen decided to stop using xenfv and use pc-$version instead (with
$version being what was current at release time, 1.6 for xen 4.4 I
think, to avoid surprises like the address space layout changes in more
recent machine types).
To be more exact, 'xen_platform_pci' should determine this at this point,
if (!libxl_defbool_val(b_info->u.hvm.xen_platform_pci)) {
/* Switching here to the machine "pc" which does not add
* the xen-platform device instead of the default "xenfv"
machine.
*/
machinearg = libxl__sprintf(gc, "pc,accel=xen");
} else {
machinearg = libxl__sprintf(gc, "xenfv");
}
But you may remember, in our case we always set 'xen_platform_pci=0'
since we need to release slot 2 for IGD. So finally we really go pc case.
Anyway this means something should be changed to pass such a new machine
property in Xen side. And I'll send a patch to address this firstly,
then go back here.
Thanks
Tiejun
