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Date: Fri, 14 Dec 2018 13:00:21 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, KarimAllah Ahmed <karahmed@...zon.de>,
David Woodhouse <dwmw@...zon.co.uk>,
Thomas Gleixner <tglx@...utronix.de>,
Paolo Bonzini <pbonzini@...hat.com>,
Darren Kenny <darren.kenny@...cle.com>,
Jim Mattson <jmattson@...gle.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Andi Kleen <ak@...ux.intel.com>,
Jun Nakajima <jun.nakajima@...el.com>, kvm@...r.kernel.org,
Dave Hansen <dave.hansen@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Asit Mallick <asit.k.mallick@...el.com>,
Arjan Van De Ven <arjan.van.de.ven@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Ashok Raj <ashok.raj@...el.com>,
Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.4 47/88] KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: KarimAllah Ahmed <karahmed@...zon.de>
commit 28c1c9fabf48d6ad596273a11c46e0d0da3e14cd upstream.
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]
Signed-off-by: KarimAllah Ahmed <karahmed@...zon.de>
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
Reviewed-by: Darren Kenny <darren.kenny@...cle.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jun Nakajima <jun.nakajima@...el.com>
Cc: kvm@...r.kernel.org
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Asit Mallick <asit.k.mallick@...el.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@...el.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Link: https://lkml.kernel.org/r/1517522386-18410-4-git-send-email-karahmed@amazon.de
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/kvm/cpuid.c | 11 +++++++++--
arch/x86/kvm/cpuid.h | 8 ++++++++
arch/x86/kvm/vmx.c | 15 +++++++++++++++
arch/x86/kvm/x86.c | 1 +
4 files changed, 33 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -362,6 +362,10 @@ static inline int __do_cpuid_ent(struct
const u32 kvm_supported_word10_x86_features =
F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves;
+ /* cpuid 7.0.edx*/
+ const u32 kvm_cpuid_7_0_edx_x86_features =
+ F(ARCH_CAPABILITIES);
+
/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();
@@ -439,11 +443,14 @@ static inline int __do_cpuid_ent(struct
cpuid_mask(&entry->ebx, 9);
// TSC_ADJUST is emulated
entry->ebx |= F(TSC_ADJUST);
- } else
+ entry->edx &= kvm_cpuid_7_0_edx_x86_features;
+ cpuid_mask(&entry->edx, CPUID_7_EDX);
+ } else {
entry->ebx = 0;
+ entry->edx = 0;
+ }
entry->eax = 0;
entry->ecx = 0;
- entry->edx = 0;
break;
}
case 9:
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -170,6 +170,14 @@ static inline bool guest_cpuid_has_ibpb(
return best && (best->edx & bit(X86_FEATURE_SPEC_CTRL));
}
+static inline bool guest_cpuid_has_arch_capabilities(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 7, 0);
+ return best && (best->edx & bit(X86_FEATURE_ARCH_CAPABILITIES));
+}
+
/*
* NRIPS is provided through cpuidfn 0x8000000a.edx bit 3
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -545,6 +545,8 @@ struct vcpu_vmx {
u64 msr_guest_kernel_gs_base;
#endif
+ u64 arch_capabilities;
+
u32 vm_entry_controls_shadow;
u32 vm_exit_controls_shadow;
/*
@@ -2832,6 +2834,12 @@ static int vmx_get_msr(struct kvm_vcpu *
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_arch_capabilities(vcpu))
+ 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;
@@ -2958,6 +2966,11 @@ static int vmx_set_msr(struct kvm_vcpu *
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))
@@ -5002,6 +5015,8 @@ static int vmx_vcpu_setup(struct vcpu_vm
++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);
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -961,6 +961,7 @@ 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;
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