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Message-ID: <lsq.1528380321.971111777@decadent.org.uk>
Date: Thu, 07 Jun 2018 15:05:21 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, kvm@...r.kernel.org,
"KarimAllah Ahmed" <karahmed@...zon.de>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
"Thomas Gleixner" <tglx@...utronix.de>,
"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
"Andi Kleen" <ak@...ux.intel.com>,
"Andy Lutomirski" <luto@...nel.org>,
"Arjan Van De Ven" <arjan.van.de.ven@...el.com>,
"Darren Kenny" <darren.kenny@...cle.com>,
"Dan Williams" <dan.j.williams@...el.com>,
"Dave Hansen" <dave.hansen@...el.com>,
"Jim Mattson" <jmattson@...gle.com>,
"Jun Nakajima" <jun.nakajima@...el.com>,
"Andrea Arcangeli" <aarcange@...hat.com>,
"David Woodhouse" <dwmw@...zon.co.uk>,
"Ashok Raj" <ashok.raj@...el.com>,
"Asit Mallick" <asit.k.mallick@...el.com>,
"Greg KH" <gregkh@...uxfoundation.org>,
"Paolo Bonzini" <pbonzini@...hat.com>,
"Tim Chen" <tim.c.chen@...ux.intel.com>
Subject: [PATCH 3.16 056/410] KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES
3.16.57-rc1 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 3.16:
- Add mapping of the relevant CPUID word
- Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
arch/x86/kvm/cpuid.c | 11 +++++++++--
arch/x86/kvm/cpuid.h | 8 ++++++++
arch/x86/kvm/vmx.c | 15 +++++++++++++++
arch/x86/kvm/x86.c | 3 ++-
4 files changed, 34 insertions(+), 3 deletions(-)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -316,6 +316,10 @@ static inline int __do_cpuid_ent(struct
F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
F(ADX) | F(SMAP);
+ /* 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();
@@ -387,11 +391,14 @@ 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, 10);
+ } 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
@@ -115,5 +115,13 @@ 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));
+}
+
#endif
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -432,6 +432,8 @@ struct vcpu_vmx {
u64 msr_guest_kernel_gs_base;
#endif
+ u64 arch_capabilities;
+
u32 vm_entry_controls_shadow;
u32 vm_exit_controls_shadow;
/*
@@ -2522,6 +2524,12 @@ static int vmx_get_msr(struct kvm_vcpu *
case MSR_IA32_TSC:
msr_info->data = guest_read_tsc();
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;
@@ -2641,6 +2649,11 @@ 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))
@@ -4584,6 +4597,8 @@ 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
@@ -893,7 +893,8 @@ static u32 msrs_to_save[] = {
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
- MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS
+ MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS,
+ MSR_IA32_ARCH_CAPABILITIES
};
static unsigned num_msrs_to_save;
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