[Qemu-devel] [PATCH v3 4/4] KVM/X86: Enable Intel MPX for guest

[Liu, Jinsong]

>From c2b3b4347b4c8b0aa6b5e97c161fd4d34b0ef4d3 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <address@hidden>
Date: Fri, 13 Dec 2013 02:34:48 +0800
Subject: [PATCH v3 4/4] KVM/X86: Enable Intel MPX for guest.

This patch enable Intel MPX feature to guest.

Signed-off-by: Xudong Hao <address@hidden>
Signed-off-by: Liu Jinsong <address@hidden>
---
 arch/x86/kvm/cpuid.c |    2 +-
 arch/x86/kvm/x86.c   |    3 +++
 arch/x86/kvm/x86.h   |    3 ++-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2d661e6..e30d4ce 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -303,7 +303,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 
*entry, u32 function,
        /* cpuid 7.0.ebx */
        const u32 kvm_supported_word9_x86_features =
                F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
-               F(BMI2) | F(ERMS) | f_invpcid | F(RTM);
+               F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | F(MPX);
 
        /* all calls to cpuid_count() should be made on the same cpu */
        get_cpu();
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8ca2269..410421a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -597,6 +597,9 @@ int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
        if (xcr0 & ~valid_bits)
                return 1;
 
+       if ((!(xcr0 & XSTATE_BNDREGS)) != (!(xcr0 & XSTATE_BNDCSR)))
+               return 1;
+
        kvm_put_guest_xcr0(vcpu);
        vcpu->arch.xcr0 = xcr0;
 
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 587fb9e..985e40e 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -122,7 +122,8 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt 
*ctxt,
        gva_t addr, void *val, unsigned int bytes,
        struct x86_exception *exception);
 
-#define KVM_SUPPORTED_XCR0     (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
+#define KVM_SUPPORTED_XCR0     (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
+                               | XSTATE_BNDREGS | XSTATE_BNDCSR)
 extern u64 host_xcr0;
 
 extern struct static_key kvm_no_apic_vcpu;
-- 
1.7.1