[Xen-devel] [PATCH 6/6] x86/cpuid: Offer ITSC to domains which are automatically non-migrateable

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Dom0 doesn't have a toolstack to explicitly decide that ITSC is safe to offer.
For domains which are constructed with disable_migrate set, offer ITSC
automatically.

This is important for HVM-based dom0, and for when cpuid faulting is imposed
on the control domain.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/cpuid.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index 9f16502..bf1eed6 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -440,6 +440,9 @@ int init_domain_cpuid_policy(struct domain *d)
 
     *d->arch.cpuid = is_pv_domain(d) ? pv_max_policy : hvm_max_policy;
 
+    if ( d->disable_migrate )
+        d->arch.cpuid->extd.itsc = cpu_has_itsc;
+
     recalculate_cpuid_policy(d);
 
     for ( i = 0; i < MAX_CPUID_INPUT; i++ )
-- 
2.1.4


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