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i386/tdx: Wire CPU features up with attributes of TD guest

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For QEMU VMs,
  - PKS is configured via CPUID_7_0_ECX_PKS, e.g., -cpu xxx,+pks  and
  - PMU is configured by x86cpu->enable_pmu, e.g., -cpu xxx,pmu=on

While the bit 30 (PKS) and bit 63 (PERFMON) of TD's attributes are also
used to configure the PKS and PERFMON/PMU of TD, reuse the existing
configuration interfaces of 'cpu' for TD's attributes.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-12-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-05-08 10:59:17 -04:00 • committed by Paolo Bonzini
parent 714af52276
commit bb3be394cf
1 changed files with 13 additions and 0 deletions
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13
target/i386/kvm/tdx.c
View file

@ -19,6 +19,8 @@
#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;
@ -151,6 +153,15 @@ static int tdx_kvm_type(X86ConfidentialGuest *cg)
return KVM_X86_TDX_VM;
}
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;
}
static int setup_td_xfam(X86CPU *x86cpu, Error **errp)
{
CPUX86State *env = &x86cpu->env;
@ -214,6 +225,8 @@ int tdx_pre_create_vcpu(CPUState *cpu, Error **errp)
init_vm = g_malloc0(sizeof(struct kvm_tdx_init_vm) +
sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES);
setup_td_guest_attributes(x86cpu);
r = setup_td_xfam(x86cpu, errp);
if (r) {
return r;