Merge remote-tracking branch 'kvm-mips/next'

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index b54bcadd8aecab6c294591361cae8c64818247c6..4d7e0e466b5a02ddcc3c1d4f2a2938234dcb762b 100644 (file)
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -107,6 +107,20 @@
 #define KVM_INVALID_INST               0xdeadbeef
 #define KVM_INVALID_ADDR               0xdeadbeef
 
+/*
+ * EVA has overlapping user & kernel address spaces, so user VAs may be >
+ * PAGE_OFFSET. For this reason we can't use the default KVM_HVA_ERR_BAD of
+ * PAGE_OFFSET.
+ */
+
+#define KVM_HVA_ERR_BAD                        (-1UL)
+#define KVM_HVA_ERR_RO_BAD             (-2UL)
+
+static inline bool kvm_is_error_hva(unsigned long addr)
+{
+       return IS_ERR_VALUE(addr);
+}
+
 extern atomic_t kvm_mips_instance;
 
 struct kvm_vm_stat {

diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index 091553942bcbca51941fa768b67bdcc3f5dfecdc..3a5484f9aa5078a3c5a67b35c2e56b8cbd09c35b 100644 (file)
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -175,6 +175,24 @@ static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
                        run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                        ret = RESUME_HOST;
                }
+       } else if (KVM_GUEST_KERNEL_MODE(vcpu)
+                  && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
+               /*
+                * With EVA we may get a TLB exception instead of an address
+                * error when the guest performs MMIO to KSeg1 addresses.
+                */
+               kvm_debug("Emulate %s MMIO space\n",
+                         store ? "Store to" : "Load from");
+               er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
+               if (er == EMULATE_FAIL) {
+                       kvm_err("Emulate %s MMIO space failed\n",
+                               store ? "Store to" : "Load from");
+                       run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+                       ret = RESUME_HOST;
+               } else {
+                       run->exit_reason = KVM_EXIT_MMIO;
+                       ret = RESUME_HOST;
+               }
        } else {
                kvm_err("Illegal TLB %s fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
                        store ? "ST" : "LD", cause, opc, badvaddr);