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Add HAP to xen hypervisor capabilities

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xen-unstable c/s 16931 introduced a per-domain setting for hvm
guests to enable/disable hardware assisted paging.  If disabled,
software techniques such as shadow page tables are used.  If enabled,
and the feature exists in underlying hardware, hardware support for
paging is used.

Xen does not provide a mechanism to discover the HAP capability, so
we advertise its availability for hvm guests on Xen >= 3.3.
This commit is contained in:
Jim Fehlig 2011-01-05 15:20:01 -07:00
parent 041973504f
commit af521a0182
1 changed files with 10 additions and 0 deletions
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10
src/xen/xen_hypervisor.c
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@ -2321,6 +2321,16 @@ xenHypervisorBuildCapabilities(virConnectPtr conn,
hv_minor > 0 ?
0 : 1)) == NULL)
goto no_memory;
/* Xen 3.3.x and beyond supports enabling/disabling
* hardware assisted paging. Default is off.
*/
if ((hv_major == 3 && hv_minor >= 3) || (hv_major > 3))
if (virCapabilitiesAddGuestFeature(guest,
"hap",
0,
1) == NULL)
goto no_memory;
}
}