MIPS: KVM: Add CP0_EPC KVM register access

Contrary to the comment, the guest CP0_EPC register cannot be set via
kvm_regs, since it is distinct from the guest PC. Add the EPC register
to the KVM_{GET,SET}_ONE_REG ioctl interface.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: kvm@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: David Daney <david.daney@cavium.com>
Cc: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c
index 2a80a906ccc7..6b890ebe0e04 100644
--- a/arch/mips/kvm/kvm_mips.c
+++ b/arch/mips/kvm/kvm_mips.c
@@ -507,6 +507,7 @@ kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 #define KVM_REG_MIPS_CP0_COMPARE        MIPS_CP0_32(11, 0)
 #define KVM_REG_MIPS_CP0_STATUS         MIPS_CP0_32(12, 0)
 #define KVM_REG_MIPS_CP0_CAUSE          MIPS_CP0_32(13, 0)
+#define KVM_REG_MIPS_CP0_EPC            MIPS_CP0_64(14, 0)
 #define KVM_REG_MIPS_CP0_EBASE          MIPS_CP0_64(15, 1)
 #define KVM_REG_MIPS_CP0_CONFIG         MIPS_CP0_32(16, 0)
 #define KVM_REG_MIPS_CP0_CONFIG1        MIPS_CP0_32(16, 1)
@@ -562,7 +563,7 @@ static u64 kvm_mips_get_one_regs[] = {
         KVM_REG_MIPS_CP0_ENTRYHI,
         KVM_REG_MIPS_CP0_STATUS,
         KVM_REG_MIPS_CP0_CAUSE,
-        /* EPC set via kvm_regs, et al. */
+        KVM_REG_MIPS_CP0_EPC,
         KVM_REG_MIPS_CP0_CONFIG,
         KVM_REG_MIPS_CP0_CONFIG1,
         KVM_REG_MIPS_CP0_CONFIG2,
@@ -615,6 +616,9 @@ static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
         case KVM_REG_MIPS_CP0_CAUSE:
                 v = (long)kvm_read_c0_guest_cause(cop0);
                 break;
+        case KVM_REG_MIPS_CP0_EPC:
+                v = (long)kvm_read_c0_guest_epc(cop0);
+                break;
         case KVM_REG_MIPS_CP0_ERROREPC:
                 v = (long)kvm_read_c0_guest_errorepc(cop0);
                 break;
@@ -711,6 +715,9 @@ static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
         case KVM_REG_MIPS_CP0_CAUSE:
                 kvm_write_c0_guest_cause(cop0, v);
                 break;
+        case KVM_REG_MIPS_CP0_EPC:
+                kvm_write_c0_guest_epc(cop0, v);
+                break;
         case KVM_REG_MIPS_CP0_ERROREPC:
                 kvm_write_c0_guest_errorepc(cop0, v);
                 break;