[RFC PATCH v3 13/36] i386/tdx: Wire CPU features up with attributes of TD guest

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

For QEMU VMs, PKS is configured via CPUID_7_0_ECX_PKS and PMU is
configured by x86cpu->enable_pmu. Reuse the existing configuration
interface for TDX VMs.

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 target/i386/kvm/tdx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 409526765304..de4146025995 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -22,6 +22,8 @@
 #include "tdx.h"
 
 #define TDX_TD_ATTRIBUTES_SEPT_VE_DISABLE   BIT_ULL(28)
+#define TDX_TD_ATTRIBUTES_PKS               BIT_ULL(30)
+#define TDX_TD_ATTRIBUTES_PERFMON           BIT_ULL(63)
 
 static TdxGuest *tdx_guest;
 
@@ -152,6 +154,15 @@ void tdx_get_supported_cpuid(uint32_t function, uint32_t index, int reg,
     }
 }
 
+static void setup_td_guest_attributes(X86CPU *x86cpu)
+{
+    CPUX86State *env = &x86cpu->env;
+
+    tdx_guest->attributes |= (env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_PKS) ?
+                             TDX_TD_ATTRIBUTES_PKS : 0;
+    tdx_guest->attributes |= x86cpu->enable_pmu ? TDX_TD_ATTRIBUTES_PERFMON : 0;
+}
+
 int tdx_pre_create_vcpu(CPUState *cpu)
 {
     struct {
@@ -178,6 +189,8 @@ int tdx_pre_create_vcpu(CPUState *cpu)
         goto out;
     }
 
+    setup_td_guest_attributes(x86cpu);
+
     memset(&cpuid_data, 0, sizeof(cpuid_data));
     cpuid_data.cpuid.nent = kvm_x86_arch_cpuid(env, cpuid_data.entries, 0);
 
-- 
2.27.0