From ae3e61e1c28338d077b704505570fa181df1e41f Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 12 Jul 2016 10:36:41 +0200
Subject: [PATCH] KVM: x86: add support for UMIP
Git-commit: ae3e61e1c28338d077b704505570fa181df1e41f
Patch-mainline: v4.16-rc1
References: bsc#1120716
Add the CPUID bits, make the CR4.UMIP bit not reserved anymore, and
add UMIP support for instructions that are already emulated by KVM.
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Lin Ma <lma@suse.com>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/cpuid.c | 4 ++--
arch/x86/kvm/emulate.c | 8 ++++++++
arch/x86/kvm/x86.c | 3 +++
4 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 57cd96783bbe..ec9d11b1f1ca 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -87,7 +87,7 @@
| X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
| X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
| X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
- | X86_CR4_SMAP | X86_CR4_PKE))
+ | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index ef53fff0c4ea..fff2281e8ac5 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -389,8 +389,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
/* cpuid 7.0.ecx*/
const u32 kvm_cpuid_7_0_ecx_x86_features =
- F(AVX512VBMI) | F(LA57) | F(PKU) |
- 0 /*OSPKE*/ | F(AVX512_VPOPCNTDQ);
+ F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ |
+ F(AVX512_VPOPCNTDQ) | F(UMIP);
/* cpuid 7.0.edx*/
const u32 kvm_cpuid_7_0_edx_x86_features =
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 4174fec19efe..a7769de08ae1 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3739,6 +3739,10 @@ static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
{
struct desc_ptr desc_ptr;
+ if ((ctxt->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
+ ctxt->ops->cpl(ctxt) > 0)
+ return emulate_gp(ctxt, 0);
+
if (ctxt->mode == X86EMUL_MODE_PROT64)
ctxt->op_bytes = 8;
get(ctxt, &desc_ptr);
@@ -3798,6 +3802,10 @@ static int em_lidt(struct x86_emulate_ctxt *ctxt)
static int em_smsw(struct x86_emulate_ctxt *ctxt)
{
+ if ((ctxt->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
+ ctxt->ops->cpl(ctxt) > 0)
+ return emulate_gp(ctxt, 0);
+
if (ctxt->dst.type == OP_MEM)
ctxt->dst.bytes = 2;
ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a71bdf51843f..8e62e3902798 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -795,6 +795,9 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
if (!guest_cpuid_has(vcpu, X86_FEATURE_LA57) && (cr4 & X86_CR4_LA57))
return 1;
+ if (!guest_cpuid_has(vcpu, X86_FEATURE_UMIP) && (cr4 & X86_CR4_UMIP))
+ return 1;
+
if (is_long_mode(vcpu)) {
if (!(cr4 & X86_CR4_PAE))
return 1;
--
2.16.2