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| author | Nadav Har'El <nyh@il.ibm.com> | 2011-05-25 20:03:24 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-07-12 08:45:10 (GMT) |
| commit | 5e1746d6205d1efa3193cc0c67aa2d15e54799bd (patch) | |
| tree | 9234ab8fddb5e7a8d86b506a19d7697566d51cfb /arch/x86/include/asm/kvm_host.h | |
| parent | ec378aeef9dfc7c4ba72e9bd6cd4bd6f7d5fd0cc (diff) | |
| download | linux-5e1746d6205d1efa3193cc0c67aa2d15e54799bd.tar.xz | |
KVM: nVMX: Allow setting the VMXE bit in CR4
This patch allows the guest to enable the VMXE bit in CR4, which is a
prerequisite to running VMXON.
Whether to allow setting the VMXE bit now depends on the architecture (svm
or vmx), so its checking has moved to kvm_x86_ops->set_cr4(). This function
now returns an int: If kvm_x86_ops->set_cr4() returns 1, __kvm_set_cr4()
will also return 1, and this will cause kvm_set_cr4() will throw a #GP.
Turning on the VMXE bit is allowed only when the nested VMX feature is
enabled, and turning it off is forbidden after a vmxon.
Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index ff17deb..d167039 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -555,7 +555,7 @@ struct kvm_x86_ops { void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu); void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0); void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3); - void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4); + int (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4); void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer); void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt); void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt); |