diff options
| author | Nadav Amit <namit@cs.technion.ac.il> | 2014-06-18 18:19:25 +0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-06-19 14:52:15 +0400 |
| commit | 1e32c07955b43e7f827174bf320ed35971117275 (patch) | |
| tree | a1479742bd802791c1d71b456296ef2ea6ff7d64 /arch | |
| parent | a449c7aa51e10c9bde0ea9bee4e682d6d067ebab (diff) | |
| download | linux-1e32c07955b43e7f827174bf320ed35971117275.tar.xz | |
KVM: vmx: handle_cr ignores 32/64-bit mode
On 32-bit mode only bits [31:0] of the CR should be used for setting the CR
value. Otherwise, the host may incorrectly assume the value is invalid if bits
[63:32] are not zero. Moreover, the CR is currently being read twice when CR8
is used. Last, nested mov-cr exiting is modified to handle the CR value
correctly as well.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b362a1a38e51..45024bf0e229 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -5058,7 +5058,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) reg = (exit_qualification >> 8) & 15; switch ((exit_qualification >> 4) & 3) { case 0: /* mov to cr */ - val = kvm_register_read(vcpu, reg); + val = kvm_register_readl(vcpu, reg); trace_kvm_cr_write(cr, val); switch (cr) { case 0: @@ -5075,7 +5075,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) return 1; case 8: { u8 cr8_prev = kvm_get_cr8(vcpu); - u8 cr8 = kvm_register_read(vcpu, reg); + u8 cr8 = (u8)val; err = kvm_set_cr8(vcpu, cr8); kvm_complete_insn_gp(vcpu, err); if (irqchip_in_kernel(vcpu->kvm)) @@ -6770,7 +6770,7 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); int cr = exit_qualification & 15; int reg = (exit_qualification >> 8) & 15; - unsigned long val = kvm_register_read(vcpu, reg); + unsigned long val = kvm_register_readl(vcpu, reg); switch ((exit_qualification >> 4) & 3) { case 0: /* mov to cr */ |