Intel processors use MSR_IA32_ARCH_CAPABILITIES MSR to indicate RDCL_NO
(bit 0) and IBRS_ALL (bit 1). This is a read-only MSR. By default the
contents will come directly from the hardware, but user-space can still
override it.
[dwmw2: The bit in kvm_cpuid_7_0_edx_x86_features can be unconditional]
Cc: Asit Mallick <asit.k.mall...@intel.com>
Cc: Dave Hansen <dave.han...@intel.com>
Cc: Arjan Van De Ven <arjan.van.de....@intel.com>
Cc: Tim Chen <tim.c.c...@linux.intel.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Jun Nakajima <jun.nakaj...@intel.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Greg KH <gre...@linuxfoundation.org>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Ashok Raj <ashok....@intel.com>
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: KarimAllah Ahmed <karah...@amazon.de>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
---
arch/x86/kvm/cpuid.c | 2 +-
arch/x86/kvm/vmx.c | 15 +++++++++++++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 033004d..1909635 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -394,7 +394,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2
*entry, u32 function,
/* cpuid 7.0.edx*/
const u32 kvm_cpuid_7_0_edx_x86_features =
- F(AVX512_4VNNIW) | F(AVX512_4FMAPS);
+ F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(ARCH_CAPABILITIES);
/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 263eb1f..b13314a 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -593,6 +593,8 @@ struct vcpu_vmx {
u64 msr_guest_kernel_gs_base;
#endif
+ u64 arch_capabilities;
+
u32 vm_entry_controls_shadow;
u32 vm_exit_controls_shadow;
u32 secondary_exec_control;
@@ -3262,6 +3264,12 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct
msr_data *msr_info)
case MSR_IA32_TSC:
msr_info->data = guest_read_tsc(vcpu);
break;
+ case MSR_IA32_ARCH_CAPABILITIES:
+ if (!msr_info->host_initiated &&
+ !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES))
+ return 1;
+ msr_info->data = to_vmx(vcpu)->arch_capabilities;
+ break;
case MSR_IA32_SYSENTER_CS:
msr_info->data = vmcs_read32(GUEST_SYSENTER_CS);
break;
@@ -3397,6 +3405,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct
msr_data *msr_info)
vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap,
MSR_IA32_PRED_CMD,
MSR_TYPE_W);
break;
+ case MSR_IA32_ARCH_CAPABILITIES:
+ if (!msr_info->host_initiated)
+ return 1;
+ vmx->arch_capabilities = data;
+ break;
case MSR_IA32_CR_PAT:
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
if (!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, data))
@@ -5659,6 +5672,8 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
++vmx->nmsrs;
}
+ if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES))
+ rdmsrl(MSR_IA32_ARCH_CAPABILITIES, vmx->arch_capabilities);
vm_exit_controls_init(vmx, vmcs_config.vmexit_ctrl);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c53298d..4ec142e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1009,6 +1009,7 @@ static u32 msrs_to_save[] = {
#endif
MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS, MSR_TSC_AUX,
+ MSR_IA32_ARCH_CAPABILITIES
};
static unsigned num_msrs_to_save;
--
2.7.4
