From af521a0182a0d6867796c65b1b0cd83fb14032a9 Mon Sep 17 00:00:00 2001 From: Jim Fehlig Date: Wed, 5 Jan 2011 15:20:01 -0700 Subject: [PATCH] Add HAP to xen hypervisor capabilities 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 file changed, 10 insertions(+) diff --git a/src/xen/xen_hypervisor.c b/src/xen/xen_hypervisor.c index ead8ee9b39..229ef3d4d5 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; } } -- GitLab