diff mbox series

[v1,16/40] i386/tdx: Wire CPU features up with attributes of TD guest

Message ID 20220802074750.2581308-17-xiaoyao.li@intel.com
State New
Headers show
Series TDX QEMU support | expand

Commit Message

Xiaoyao Li Aug. 2, 2022, 7:47 a.m. UTC 
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@intel.com>
---
 target/i386/kvm/tdx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Comments

Gerd Hoffmann Aug. 25, 2022, 11:38 a.m. UTC | #1 
On Tue, Aug 02, 2022 at 03:47:26PM +0800, Xiaoyao Li wrote:
> 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.

Acked-by: Gerd Hoffmann <kraxel@redhat.com>
diff mbox series

Patch

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index bf57f270ac9d..f2372002077d 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -31,6 +31,8 @@ 
                                      (1U << KVM_FEATURE_MSI_EXT_DEST_ID))
 
 #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)
 
 #define TDX_ATTRIBUTES_MAX_BITS      64
 
@@ -460,6 +462,15 @@  int tdx_kvm_init(MachineState *ms, Error **errp)
     return 0;
 }
 
+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)
 {
     MachineState *ms = MACHINE(qdev_get_machine());
@@ -473,6 +484,8 @@  int tdx_pre_create_vcpu(CPUState *cpu)
         goto out;
     }
 
+    setup_td_guest_attributes(x86cpu);
+
     memset(&init_vm, 0, sizeof(init_vm));
     init_vm.cpuid.nent = kvm_x86_arch_cpuid(env, init_vm.entries, 0);