MIPS: KVM: Combine handle_tlb_ld/st_miss

The handle_tlb_ld/st_miss handlers are logically equivalent and
textually almost identical, so combine their implementations into a
single kvm_trap_emul_handle_tlb_miss().

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 19 insertions, 52 deletions

diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index ecf0068bc95e..09b97fa9dabb 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -128,7 +128,7 @@ static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu)
         return ret;
 }
 
-static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
+static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
 {
         struct kvm_run *run = vcpu->run;
         u32 __user *opc = (u32 __user *) vcpu->arch.pc;
@@ -145,55 +145,8 @@ static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
                 }
         } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
                    || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
-                kvm_debug("USER ADDR TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
-                          cause, opc, badvaddr);
-                er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu);
-                if (er == EMULATE_DONE)
-                        ret = RESUME_GUEST;
-                else {
-                        run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-                        ret = RESUME_HOST;
-                }
-        } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
-                /*
-                 * All KSEG0 faults are handled by KVM, as the guest kernel does
-                 * not expect to ever get them
-                 */
-                if (kvm_mips_handle_kseg0_tlb_fault
-                    (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) {
-                        run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-                        ret = RESUME_HOST;
-                }
-        } else {
-                kvm_err("Illegal TLB LD fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
-                        cause, opc, badvaddr);
-                kvm_mips_dump_host_tlbs();
-                kvm_arch_vcpu_dump_regs(vcpu);
-                run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-                ret = RESUME_HOST;
-        }
-        return ret;
-}
-
-static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
-{
-        struct kvm_run *run = vcpu->run;
-        u32 __user *opc = (u32 __user *) vcpu->arch.pc;
-        unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
-        u32 cause = vcpu->arch.host_cp0_cause;
-        enum emulation_result er = EMULATE_DONE;
-        int ret = RESUME_GUEST;
-
-        if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR)
-            && KVM_GUEST_KERNEL_MODE(vcpu)) {
-                if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) {
-                        run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-                        ret = RESUME_HOST;
-                }
-        } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
-                   || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
-                kvm_debug("USER ADDR TLB ST fault: PC: %#lx, BadVaddr: %#lx\n",
-                          vcpu->arch.pc, badvaddr);
+                kvm_debug("USER ADDR TLB %s fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
+                          store ? "ST" : "LD", cause, opc, badvaddr);
 
                 /*
                  * User Address (UA) fault, this could happen if
@@ -213,14 +166,18 @@ static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
                         ret = RESUME_HOST;
                 }
         } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
+                /*
+                 * All KSEG0 faults are handled by KVM, as the guest kernel does
+                 * not expect to ever get them
+                 */
                 if (kvm_mips_handle_kseg0_tlb_fault
                     (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) {
                         run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                         ret = RESUME_HOST;
                 }
         } else {
-                kvm_err("Illegal TLB ST fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
-                        cause, opc, badvaddr);
+                kvm_err("Illegal TLB %s fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
+                        store ? "ST" : "LD", cause, opc, badvaddr);
                 kvm_mips_dump_host_tlbs();
                 kvm_arch_vcpu_dump_regs(vcpu);
                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
@@ -229,6 +186,16 @@ static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
         return ret;
 }
 
+static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
+{
+        return kvm_trap_emul_handle_tlb_miss(vcpu, true);
+}
+
+static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
+{
+        return kvm_trap_emul_handle_tlb_miss(vcpu, false);
+}
+
 static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu)
 {
         struct kvm_run *run = vcpu->run;