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KVM: x86: check DR6/7 high-bits are clear only on long-mode 

When the guest sets DR6 and DR7, KVM asserts the high 32-bits are clear, and
otherwise injects a #GP exception. This exception should only be injected only
if running in long-mode.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-06-18 17:19:23 +03:00 committed by Paolo Bonzini
parent 5381417f6a
commit 5777392e83
2 changed files with 19 additions and 1 deletions
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2
arch/x86/kvm/vmx.c
View File

@ -5184,7 +5184,7 @@ static int handle_dr(struct kvm_vcpu *vcpu)
return 1;
kvm_register_write(vcpu, reg, val);
} else
if (kvm_set_dr(vcpu, dr, kvm_register_read(vcpu, reg)))
if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg)))
return 1;
skip_emulated_instruction(vcpu);

18
arch/x86/kvm/x86.h
View File

@ -47,6 +47,16 @@ static inline int is_long_mode(struct kvm_vcpu *vcpu)
#endif
}
static inline bool is_64_bit_mode(struct kvm_vcpu *vcpu)
{
int cs_db, cs_l;
if (!is_long_mode(vcpu))
return false;
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
return cs_l;
}
static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)
{
return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;
@ -108,6 +118,14 @@ static inline bool vcpu_match_mmio_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
return false;
}
static inline unsigned long kvm_register_readl(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
unsigned long val = kvm_register_read(vcpu, reg);
return is_64_bit_mode(vcpu) ? val : (u32)val;
}
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);