[Xen-devel] [PATCH 02/10] x86/emul: Add feature check for clzero

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 497cc77..7af8a42 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -1604,6 +1604,7 @@ static bool vcpu_has(
 #define vcpu_has_clwb()        vcpu_has(         7, EBX, 24, ctxt, ops)
 #define vcpu_has_sha()         vcpu_has(         7, EBX, 29, ctxt, ops)
 #define vcpu_has_rdpid()       vcpu_has(         7, ECX, 22, ctxt, ops)
+#define vcpu_has_clzero()      vcpu_has(0x80000008, EBX,  0, ctxt, ops)
 
 #define vcpu_must_have(feat) \
     generate_exception_if(!vcpu_has_##feat(), EXC_UD)
@@ -5183,6 +5184,8 @@ x86_emulate(
         {
             unsigned long zero = 0;
 
+            vcpu_must_have(clzero);
+
             base = ad_bytes == 8 ? _regs.r(ax) :
                    ad_bytes == 4 ? _regs.eax : _regs.ax;
             limit = 0;
-- 
2.1.4


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