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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2010-01-20 18:20:20 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:36:01 -0300 |
| commit | f2483415293b180945da707e7dbe74e5daa72651 (patch) | |
| tree | 0c8d5e8ec02ae6f06f1dd1cf68d36e2a9fce6287 /arch | |
| parent | b60d513c32e2ddc8b3e9e1465b94913d44d19810 (diff) | |
| download | linux-f2483415293b180945da707e7dbe74e5daa72651.tar.gz linux-f2483415293b180945da707e7dbe74e5daa72651.tar.bz2 linux-f2483415293b180945da707e7dbe74e5daa72651.zip | |
KVM: VMX: Fix exceptions of mov to dr
Injecting GP without an error code is a bad idea (causes unhandled guest
exits). Moreover, we must not skip the instruction if we injected an
exception.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 516084f3c6d8..9727773f24b7 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3045,6 +3045,7 @@ static int handle_dr(struct kvm_vcpu *vcpu) unsigned long val; int dr, reg; + /* Do not handle if the CPL > 0, will trigger GP on re-entry */ if (!kvm_require_cpl(vcpu, 0)) return 1; dr = vmcs_readl(GUEST_DR7); @@ -3099,20 +3100,22 @@ static int handle_dr(struct kvm_vcpu *vcpu) vcpu->arch.eff_db[dr] = val; break; case 4 ... 5: - if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) + if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) { kvm_queue_exception(vcpu, UD_VECTOR); + return 1; + } break; case 6: if (val & 0xffffffff00000000ULL) { - kvm_queue_exception(vcpu, GP_VECTOR); - break; + kvm_inject_gp(vcpu, 0); + return 1; } vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1; break; case 7: if (val & 0xffffffff00000000ULL) { - kvm_queue_exception(vcpu, GP_VECTOR); - break; + kvm_inject_gp(vcpu, 0); + return 1; } vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { |