[Xen-devel] [PATCH] x86/pvh: Fix pvh dom0 boot after dab11417d

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Changeset dab11417d
"x86/HVM: consolidate and sanitize CR4 guest reserved bit determination"

did not take into account the fact that dom0 does not have a cpuid policy.  As
a result, PVH dom0s would be given unexpected #GP faults on boot.

In addition to the restore case (where the toolstack has not had time to load
a cpuid policy), unconditionally exempt the hardware domain from needing a
policy.

Reported-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index ef2411c..db54814 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1738,7 +1738,7 @@ static unsigned long hvm_cr4_guest_reserved_bits(const 
struct vcpu *v,
     unsigned int leaf1_ecx = 0, leaf1_edx = 0;
     unsigned int leaf7_0_ebx = 0, leaf7_0_ecx = 0;
 
-    if ( likely(!restore) )
+    if ( !restore && !is_hardware_domain(v->domain) )
     {
         unsigned int level;
 
-- 
1.7.10.4


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