KVM: fix segment_base() error checking

[safe/jmp/linux-2.6] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1aa4d6e..814e72a 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -230,15 +230,17 @@ unsigned long segment_base(u16 selector)
        unsigned long table_base;
        unsigned long v;
 
-       if (selector == 0)
+       if (!(selector & ~3))
                return 0;
 
-       kvm_get_gdt(&gdt);
+       native_store_gdt(&gdt);
        table_base = gdt.address;
 
        if (selector & 4) {           /* from ldt */
                u16 ldt_selector = kvm_read_ldt();
 
+               if (!(ldt_selector & ~3))
+                       return 0;
                table_base = segment_base(ldt_selector);
        }
        d = (struct desc_struct *)(table_base + (selector & ~7));
@@ -475,7 +477,6 @@ void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
        }
 
        kvm_x86_ops->set_cr0(vcpu, cr0);
-       vcpu->arch.cr0 = cr0;
 
        kvm_mmu_reset_context(vcpu);
        return;
@@ -1090,6 +1091,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                break;
        case MSR_K7_HWCR:
                data &= ~(u64)0x40;     /* ignore flush filter disable */
+               data &= ~(u64)0x100;    /* ignore ignne emulation enable */
                if (data != 0) {
                        pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
                                data);