linux-kernel - [Qemu-devel][PATCH 4/4] Report CPUID xsave area support for CET.

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Date:   Wed, 26 Dec 2018 16:25:20 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     qemu-devel@...gnu.org, pbonzini@...hat.com, rkrcmar@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org, mst@...hat.com,
        yu-cheng.yu@...el.com, yi.z.zhang@...el.com, hjl.tools@...il.com
Cc:     Yang Weijiang <weijiang.yang@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>
Subject: [Qemu-devel][PATCH 4/4] Report CPUID xsave area support for CET.

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 <yi.z.zhang@...ux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 target/i386/cpu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index cf4f2798dc..78994bfa1d 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4396,12 +4396,22 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             *ebx = xsave_area_size(env->xcr0);
         } else if (count == 1) {
             *eax = env->features[FEAT_XSAVE];
+            *ecx = env->features[FEAT_XSAVE_SV_LO];
+            *edx = env->features[FEAT_XSAVE_SV_HI];
+            *ebx = xsave_area_size_compat(x86_cpu_xsave_components(cpu) |
+                    x86_cpu_xsave_sv_components(cpu));
         } 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 = esa_sv->offset;
+                *ecx = 1;
+            }
         }
         break;
     }
-- 
2.17.1