[xen staging] x86/mem_sharing: gate enabling on cpu_has_vmx

[patchbot@xxxxxxx]

commit b66e28226dd9df8a28101438f44c0a26d63b76fa
Author:     Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
AuthorDate: Wed May 27 09:50:55 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed May 27 09:50:55 2020 +0200

    x86/mem_sharing: gate enabling on cpu_has_vmx
    
    It is unclear whether mem_sharing was ever made to work on other 
architectures
    but at this time the only verified platform for it is vmx. No plans to 
support
    or maintain it on other architectures. Make this explicit by checking during
    initialization.
    
    Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
    Reviewed-by: Wei Liu <wl@xxxxxxx>
---
 xen/arch/x86/mm/mem_sharing.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
index 7271e5c90b..19922ab5d1 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1444,7 +1444,7 @@ static inline int mem_sharing_control(struct domain *d, 
bool enable,
 {
     if ( enable )
     {
-        if ( unlikely(!is_hvm_domain(d)) )
+        if ( unlikely(!is_hvm_domain(d) || !cpu_has_vmx) )
             return -EOPNOTSUPP;
 
         if ( unlikely(!hap_enabled(d)) )
--
generated by git-patchbot for /home/xen/git/xen.git#staging