[Xen-changelog] [xen master] x86/cpuid: Offer ITSC to domains which are automatically non-migrateable

[patchbot@xxxxxxx]

commit 3f50ad8dae7f01df3adbbec7b9ce34b61f13d09c
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Jan 9 12:54:55 2017 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Jan 18 14:32:30 2017 +0000

    x86/cpuid: Offer ITSC to domains which are automatically non-migrateable
    
    Dom0 doesn't have a toolstack to explicitly decide that ITSC is safe to 
offer.
    For domains which are automatically built 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>
    Reviewed-by: 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 ac2f344..eb829d7 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -427,6 +427,9 @@ 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++ )
--
generated by git-patchbot for /home/xen/git/xen.git#master

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