[RFC PATCH 6/7] target/i386: Adjust AMD XSAVE PKRU area offset in CPUID leaf 0xd

[David Edmondson <david.edmondson@oracle.com>]

AMD stores the pkru_state at a different offset to Intel, so update
the CPUID leaf which indicates such.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
---
 target/i386/cpu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 4f481691b4..9340a477a3 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1397,7 +1397,7 @@ typedef struct ExtSaveArea {
     uint32_t offset, size;
 } ExtSaveArea;
 
-static const ExtSaveArea x86_ext_save_areas[] = {
+static ExtSaveArea x86_ext_save_areas[] = {
     [XSTATE_FP_BIT] = {
         /* x87 FP state component is always enabled if XSAVE is supported */
         .feature = FEAT_1_ECX, .bits = CPUID_EXT_XSAVE,
@@ -6088,6 +6088,11 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
             mark_unavailable_features(cpu, FEAT_7_0_EBX, CPUID_7_0_EBX_INTEL_PT, prefix);
         }
     }
+
+    if (IS_AMD_CPU(env)) {
+        x86_ext_save_areas[XSTATE_PKRU_BIT].offset =
+            offsetof(X86XSaveArea, amd.pkru_state);
+    }
 }
 
 static void x86_cpu_hyperv_realize(X86CPU *cpu)
-- 
2.30.2