diff options
Diffstat (limited to 'arch/mips/kvm')
| -rw-r--r-- | arch/mips/kvm/kvm_mips_emul.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c index e75ef8219caf..d562572c2efc 100644 --- a/arch/mips/kvm/kvm_mips_emul.c +++ b/arch/mips/kvm/kvm_mips_emul.c @@ -1542,8 +1542,15 @@ kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, } if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) { + int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); int rd = (inst & RD) >> 11; int rt = (inst & RT) >> 16; + /* If usermode, check RDHWR rd is allowed by guest HWREna */ + if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) { + kvm_debug("RDHWR %#x disallowed by HWREna @ %p\n", + rd, opc); + goto emulate_ri; + } switch (rd) { case 0: /* CPU number */ arch->gprs[rt] = 0; @@ -1567,32 +1574,27 @@ kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, } break; case 29: -#if 1 arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0); -#else - /* UserLocal not implemented */ - er = EMULATE_FAIL; -#endif break; default: kvm_debug("RDHWR %#x not supported @ %p\n", rd, opc); - er = EMULATE_FAIL; - break; + goto emulate_ri; } } else { kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst); - er = EMULATE_FAIL; + goto emulate_ri; } + return EMULATE_DONE; + +emulate_ri: /* - * Rollback PC only if emulation was unsuccessful + * Rollback PC (if in branch delay slot then the PC already points to + * branch target), and pass the RI exception to the guest OS. */ - if (er == EMULATE_FAIL) { - vcpu->arch.pc = curr_pc; - er = kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); - } - return er; + vcpu->arch.pc = curr_pc; + return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); } enum emulation_result |