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x86: Support XFD and AMX xsave data migration

Browse source 
XFD(eXtended Feature Disable) allows to enable a
feature on xsave state while preventing specific
user threads from using the feature.

Support save and restore XFD MSRs if CPUID.D.1.EAX[4]
enumerate to be valid. Likewise migrate the MSRs and
related xsave state necessarily.

Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220217060434.52460-8-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zeng Guang 2022-02-16 22:04:33 -08:00 • committed by Paolo Bonzini
parent e56dd3c70a
commit cdec2b753b
3 changed files with 73 additions and 0 deletions
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18
target/i386/kvm/kvm.c
View file

@ -3277,6 +3277,13 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
env->msr_ia32_sgxlepubkeyhash[3]);
}
if (env->features[FEAT_XSAVE] & CPUID_D_1_EAX_XFD) {
kvm_msr_entry_add(cpu, MSR_IA32_XFD,
env->msr_xfd);
kvm_msr_entry_add(cpu, MSR_IA32_XFD_ERR,
env->msr_xfd_err);
}
/* Note: MSR_IA32_FEATURE_CONTROL is written separately, see
* kvm_put_msr_feature_control. */
}
@ -3669,6 +3676,11 @@ static int kvm_get_msrs(X86CPU *cpu)
kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH3, 0);
}
if (env->features[FEAT_XSAVE] & CPUID_D_1_EAX_XFD) {
kvm_msr_entry_add(cpu, MSR_IA32_XFD, 0);
kvm_msr_entry_add(cpu, MSR_IA32_XFD_ERR, 0);
}
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, cpu->kvm_msr_buf);
if (ret < 0) {
return ret;
@ -3965,6 +3977,12 @@ static int kvm_get_msrs(X86CPU *cpu)
env->msr_ia32_sgxlepubkeyhash[index - MSR_IA32_SGXLEPUBKEYHASH0] =
msrs[i].data;
break;
case MSR_IA32_XFD:
env->msr_xfd = msrs[i].data;
break;
case MSR_IA32_XFD_ERR:
env->msr_xfd_err = msrs[i].data;
break;
}
}