[Xen-changelog] [xen master] x86/traps: Don't call hvm_hypervisor_cpuid_leaf() for PV guests

[patchbot@xxxxxxx]

commit 0f43883193da76fc928e836e319c3172f394e0f3
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Nov 14 10:18:00 2016 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Nov 16 10:33:18 2016 +0000

    x86/traps: Don't call hvm_hypervisor_cpuid_leaf() for PV guests
    
    Luckily, hvm_hypervisor_cpuid_leaf() and vmx_hypervisor_cpuid_leaf() are 
safe
    to execute in the context of a PV guest, but HVM-specific feature flags
    shouldn't be visible to PV guests.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/arch/x86/traps.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 14abb62..d56d76e 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -928,6 +928,11 @@ int cpuid_hypervisor_leaves( uint32_t idx, uint32_t 
sub_idx,
         break;
 
     case 4:
+        if ( !has_hvm_container_domain(currd) )
+        {
+            *eax = *ebx = *ecx = *edx = 0;
+            break;
+        }
         hvm_hypervisor_cpuid_leaf(sub_idx, eax, ebx, ecx, edx);
         break;
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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