[Qemu-devel] [RFC PATCH v4 4/5] Report CPUID xsave area support for CET.

[Yang Weijiang]

CPUID bit definition as below:
CPUID.(EAX=d, ECX=1):ECX.CET_U(bit 11): user mode state
CPUID.(EAX=d, ECX=1):ECX.CET_S(bit 12): kernel mode state

Signed-off-by: Zhang Yi <address@hidden>
Signed-off-by: Yang Weijiang <address@hidden>
---
 target/i386/cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 11dbb9bcc4..ac0ceded89 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4382,13 +4382,22 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
             *edx = env->features[FEAT_XSAVE_COMP_HI];
             *ebx = xsave_area_size(env->xcr0);
         } else if (count == 1) {
+            /* ebx is updated in kvm.*/
             *eax = env->features[FEAT_XSAVE];
+            *ecx = env->features[FEAT_XSAVE_SV_LO];
+            *edx = env->features[FEAT_XSAVE_SV_HI];
         } else if (count < ARRAY_SIZE(x86_ext_save_areas)) {
             if ((x86_cpu_xsave_components(cpu) >> count) & 1) {
                 const ExtSaveArea *esa = &x86_ext_save_areas[count];
                 *eax = esa->size;
                 *ebx = esa->offset;
             }
+            if ((x86_cpu_xsave_sv_components(cpu) >> count) & 1) {
+                const ExtSaveArea *esa_sv = &x86_ext_save_areas[count];
+                *eax = esa_sv->size;
+                *ebx = 0;
+                *ecx = 1;
+            }
         }
         break;
     }
-- 
2.17.1