On Wed, Jan 05, 2011 at 04:32:41PM -0700, Jim Fehlig wrote: > 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. > --- > src/xen/xen_hypervisor.c | 10 ++++++++++ > 1 files changed, 10 insertions(+), 0 deletions(-) > > diff --git a/src/xen/xen_hypervisor.c b/src/xen/xen_hypervisor.c > index ead8ee9..229ef3d 100644 > --- a/src/xen/xen_hypervisor.c > +++ b/src/xen/xen_hypervisor.c > @@ -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; > } > } ACK Daniel -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list