diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 176 |
1 files changed, 154 insertions, 22 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 5c8b26183f50..b70bf22a3ff3 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -601,6 +601,30 @@ kvmppc_interrupt: stw r12,VCPU_TRAP(r9) + /* Save HEIR (HV emulation assist reg) in last_inst + if this is an HEI (HV emulation interrupt, e40) */ + li r3,KVM_INST_FETCH_FAILED +BEGIN_FTR_SECTION + cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST + bne 11f + mfspr r3,SPRN_HEIR +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +11: stw r3,VCPU_LAST_INST(r9) + + /* these are volatile across C function calls */ + mfctr r3 + mfxer r4 + std r3, VCPU_CTR(r9) + stw r4, VCPU_XER(r9) + +BEGIN_FTR_SECTION + /* If this is a page table miss then see if it's theirs or ours */ + cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE + beq kvmppc_hdsi + cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE + beq kvmppc_hisi +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) + /* See if this is a leftover HDEC interrupt */ cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER bne 2f @@ -608,7 +632,7 @@ kvmppc_interrupt: cmpwi r3,0 bge ignore_hdec 2: - /* See if this is something we can handle in real mode */ + /* See if this is an hcall we can handle in real mode */ cmpwi r12,BOOK3S_INTERRUPT_SYSCALL beq hcall_try_real_mode @@ -624,6 +648,7 @@ BEGIN_FTR_SECTION 1: END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +nohpte_cont: hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ /* Save DEC */ mfspr r5,SPRN_DEC @@ -632,36 +657,21 @@ hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ add r5,r5,r6 std r5,VCPU_DEC_EXPIRES(r9) - /* Save HEIR (HV emulation assist reg) in last_inst - if this is an HEI (HV emulation interrupt, e40) */ - li r3,-1 -BEGIN_FTR_SECTION - cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST - bne 11f - mfspr r3,SPRN_HEIR -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) -11: stw r3,VCPU_LAST_INST(r9) - /* Save more register state */ - mfxer r5 mfdar r6 mfdsisr r7 - mfctr r8 - - stw r5, VCPU_XER(r9) std r6, VCPU_DAR(r9) stw r7, VCPU_DSISR(r9) - std r8, VCPU_CTR(r9) - /* grab HDAR & HDSISR if HV data storage interrupt (HDSI) */ BEGIN_FTR_SECTION + /* don't overwrite fault_dar/fault_dsisr if HDSI */ cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE beq 6f END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) -7: std r6, VCPU_FAULT_DAR(r9) + std r6, VCPU_FAULT_DAR(r9) stw r7, VCPU_FAULT_DSISR(r9) /* Save guest CTRL register, set runlatch to 1 */ - mfspr r6,SPRN_CTRLF +6: mfspr r6,SPRN_CTRLF stw r6,VCPU_CTRL(r9) andi. r0,r6,1 bne 4f @@ -1094,9 +1104,131 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) mtspr SPRN_HSRR1, r7 ba 0x500 -6: mfspr r6,SPRN_HDAR - mfspr r7,SPRN_HDSISR - b 7b +/* + * Check whether an HDSI is an HPTE not found fault or something else. + * If it is an HPTE not found fault that is due to the guest accessing + * a page that they have mapped but which we have paged out, then + * we continue on with the guest exit path. In all other cases, + * reflect the HDSI to the guest as a DSI. + */ +kvmppc_hdsi: + mfspr r4, SPRN_HDAR + mfspr r6, SPRN_HDSISR + /* HPTE not found fault or protection fault? */ + andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h + beq 1f /* if not, send it to the guest */ + andi. r0, r11, MSR_DR /* data relocation enabled? */ + beq 3f + clrrdi r0, r4, 28 + PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */ + bne 1f /* if no SLB entry found */ +4: std r4, VCPU_FAULT_DAR(r9) + stw r6, VCPU_FAULT_DSISR(r9) + + /* Search the hash table. */ + mr r3, r9 /* vcpu pointer */ + li r7, 1 /* data fault */ + bl .kvmppc_hpte_hv_fault + ld r9, HSTATE_KVM_VCPU(r13) + ld r10, VCPU_PC(r9) + ld r11, VCPU_MSR(r9) + li r12, BOOK3S_INTERRUPT_H_DATA_STORAGE + cmpdi r3, 0 /* retry the instruction */ + beq 6f + cmpdi r3, -1 /* handle in kernel mode */ + beq nohpte_cont + cmpdi r3, -2 /* MMIO emulation; need instr word */ + beq 2f + + /* Synthesize a DSI for the guest */ + ld r4, VCPU_FAULT_DAR(r9) + mr r6, r3 +1: mtspr SPRN_DAR, r4 + mtspr SPRN_DSISR, r6 + mtspr SPRN_SRR0, r10 + mtspr SPRN_SRR1, r11 + li r10, BOOK3S_INTERRUPT_DATA_STORAGE + li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11, r11, 63 +6: ld r7, VCPU_CTR(r9) + lwz r8, VCPU_XER(r9) + mtctr r7 + mtxer r8 + mr r4, r9 + b fast_guest_return + +3: ld r5, VCPU_KVM(r9) /* not relocated, use VRMA */ + ld r5, KVM_VRMA_SLB_V(r5) + b 4b + + /* If this is for emulated MMIO, load the instruction word */ +2: li r8, KVM_INST_FETCH_FAILED /* In case lwz faults */ + + /* Set guest mode to 'jump over instruction' so if lwz faults + * we'll just continue at the next IP. */ + li r0, KVM_GUEST_MODE_SKIP + stb r0, HSTATE_IN_GUEST(r13) + + /* Do the access with MSR:DR enabled */ + mfmsr r3 + ori r4, r3, MSR_DR /* Enable paging for data */ + mtmsrd r4 + lwz r8, 0(r10) + mtmsrd r3 + + /* Store the result */ + stw r8, VCPU_LAST_INST(r9) + + /* Unset guest mode. */ + li r0, KVM_GUEST_MODE_NONE + stb r0, HSTATE_IN_GUEST(r13) + b nohpte_cont + +/* + * Similarly for an HISI, reflect it to the guest as an ISI unless + * it is an HPTE not found fault for a page that we have paged out. + */ +kvmppc_hisi: + andis. r0, r11, SRR1_ISI_NOPT@h + beq 1f + andi. r0, r11, MSR_IR /* instruction relocation enabled? */ + beq 3f + clrrdi r0, r10, 28 + PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */ + bne 1f /* if no SLB entry found */ +4: + /* Search the hash table. */ + mr r3, r9 /* vcpu pointer */ + mr r4, r10 + mr r6, r11 + li r7, 0 /* instruction fault */ + bl .kvmppc_hpte_hv_fault + ld r9, HSTATE_KVM_VCPU(r13) + ld r10, VCPU_PC(r9) + ld r11, VCPU_MSR(r9) + li r12, BOOK3S_INTERRUPT_H_INST_STORAGE + cmpdi r3, 0 /* retry the instruction */ + beq 6f + cmpdi r3, -1 /* handle in kernel mode */ + beq nohpte_cont + + /* Synthesize an ISI for the guest */ + mr r11, r3 +1: mtspr SPRN_SRR0, r10 + mtspr SPRN_SRR1, r11 + li r10, BOOK3S_INTERRUPT_INST_STORAGE + li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11, r11, 63 +6: ld r7, VCPU_CTR(r9) + lwz r8, VCPU_XER(r9) + mtctr r7 + mtxer r8 + mr r4, r9 + b fast_guest_return + +3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */ + ld r5, KVM_VRMA_SLB_V(r6) + b 4b /* * Try to handle an hcall in real mode. |