From 29f5b648fa0b31ad614c78468b9279e5fa96397a Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 11 Nov 2016 16:22:27 -0300 Subject: Linux-libre 4.8.7-gnu --- arch/mips/kvm/emulate.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index 43853ec6e..4d65285ca 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -791,15 +791,15 @@ enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) struct mips_coproc *cop0 = vcpu->arch.cop0; enum emulation_result er = EMULATE_DONE; - if (kvm_read_c0_guest_status(cop0) & ST0_EXL) { + if (kvm_read_c0_guest_status(cop0) & ST0_ERL) { + kvm_clear_c0_guest_status(cop0, ST0_ERL); + vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); + } else if (kvm_read_c0_guest_status(cop0) & ST0_EXL) { kvm_debug("[%#lx] ERET to %#lx\n", vcpu->arch.pc, kvm_read_c0_guest_epc(cop0)); kvm_clear_c0_guest_status(cop0, ST0_EXL); vcpu->arch.pc = kvm_read_c0_guest_epc(cop0); - } else if (kvm_read_c0_guest_status(cop0) & ST0_ERL) { - kvm_clear_c0_guest_status(cop0, ST0_ERL); - vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); } else { kvm_err("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", vcpu->arch.pc); @@ -1522,13 +1522,25 @@ enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DO_MMIO; + unsigned long curr_pc; u32 op, rt; u32 bytes; rt = inst.i_format.rt; op = inst.i_format.opcode; - vcpu->arch.pending_load_cause = cause; + /* + * Find the resume PC now while we have safe and easy access to the + * prior branch instruction, and save it for + * kvm_mips_complete_mmio_load() to restore later. + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + vcpu->arch.io_pc = vcpu->arch.pc; + vcpu->arch.pc = curr_pc; + vcpu->arch.io_gpr = rt; switch (op) { @@ -2488,9 +2500,8 @@ enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, goto done; } - er = update_pc(vcpu, vcpu->arch.pending_load_cause); - if (er == EMULATE_FAIL) - return er; + /* Restore saved resume PC */ + vcpu->arch.pc = vcpu->arch.io_pc; switch (run->mmio.len) { case 4: @@ -2512,11 +2523,6 @@ enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, break; } - if (vcpu->arch.pending_load_cause & CAUSEF_BD) - kvm_debug("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", - vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, - vcpu->mmio_needed); - done: return er; } -- cgit v1.2.3-54-g00ecf