| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| * |
| * Derived from book3s_interrupts.S, which is: |
| * Copyright SUSE Linux Products GmbH 2009 |
| * |
| * Authors: Alexander Graf <agraf@suse.de> |
| */ |
| |
| #include <asm/ppc_asm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/reg.h> |
| #include <asm/page.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/exception-64s.h> |
| #include <asm/ppc-opcode.h> |
| |
| /***************************************************************************** |
| * * |
| * Guest entry / exit code that is in kernel module memory (vmalloc) * |
| * * |
| ****************************************************************************/ |
| |
| /* Registers: |
| * none |
| */ |
| _GLOBAL(__kvmppc_vcore_entry) |
| |
| /* Write correct stack frame */ |
| mflr r0 |
| std r0,PPC_LR_STKOFF(r1) |
| |
| /* Save host state to the stack */ |
| stdu r1, -SWITCH_FRAME_SIZE(r1) |
| |
| /* Save non-volatile registers (r14 - r31) and CR */ |
| SAVE_NVGPRS(r1) |
| mfcr r3 |
| std r3, _CCR(r1) |
| |
| /* Save host DSCR */ |
| BEGIN_FTR_SECTION |
| mfspr r3, SPRN_DSCR |
| std r3, HSTATE_DSCR(r13) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| BEGIN_FTR_SECTION |
| /* Save host DABR */ |
| mfspr r3, SPRN_DABR |
| std r3, HSTATE_DABR(r13) |
| END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) |
| |
| /* Hard-disable interrupts */ |
| mfmsr r10 |
| std r10, HSTATE_HOST_MSR(r13) |
| rldicl r10,r10,48,1 |
| rotldi r10,r10,16 |
| mtmsrd r10,1 |
| |
| /* Save host PMU registers */ |
| BEGIN_FTR_SECTION |
| /* Work around P8 PMAE bug */ |
| li r3, -1 |
| clrrdi r3, r3, 10 |
| mfspr r8, SPRN_MMCR2 |
| mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ |
| isync |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
| li r3, 1 |
| sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ |
| mfspr r7, SPRN_MMCR0 /* save MMCR0 */ |
| mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ |
| mfspr r6, SPRN_MMCRA |
| BEGIN_FTR_SECTION |
| /* On P7, clear MMCRA in order to disable SDAR updates */ |
| li r5, 0 |
| mtspr SPRN_MMCRA, r5 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| isync |
| ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ |
| lbz r5, LPPACA_PMCINUSE(r3) |
| cmpwi r5, 0 |
| beq 31f /* skip if not */ |
| mfspr r5, SPRN_MMCR1 |
| mfspr r9, SPRN_SIAR |
| mfspr r10, SPRN_SDAR |
| std r7, HSTATE_MMCR(r13) |
| std r5, HSTATE_MMCR + 8(r13) |
| std r6, HSTATE_MMCR + 16(r13) |
| std r9, HSTATE_MMCR + 24(r13) |
| std r10, HSTATE_MMCR + 32(r13) |
| BEGIN_FTR_SECTION |
| mfspr r9, SPRN_SIER |
| std r8, HSTATE_MMCR + 40(r13) |
| std r9, HSTATE_MMCR + 48(r13) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
| mfspr r3, SPRN_PMC1 |
| mfspr r5, SPRN_PMC2 |
| mfspr r6, SPRN_PMC3 |
| mfspr r7, SPRN_PMC4 |
| mfspr r8, SPRN_PMC5 |
| mfspr r9, SPRN_PMC6 |
| BEGIN_FTR_SECTION |
| mfspr r10, SPRN_PMC7 |
| mfspr r11, SPRN_PMC8 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| stw r3, HSTATE_PMC(r13) |
| stw r5, HSTATE_PMC + 4(r13) |
| stw r6, HSTATE_PMC + 8(r13) |
| stw r7, HSTATE_PMC + 12(r13) |
| stw r8, HSTATE_PMC + 16(r13) |
| stw r9, HSTATE_PMC + 20(r13) |
| BEGIN_FTR_SECTION |
| stw r10, HSTATE_PMC + 24(r13) |
| stw r11, HSTATE_PMC + 28(r13) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| BEGIN_FTR_SECTION |
| mfspr r9, SPRN_SIER |
| std r8, HSTATE_MMCR + 40(r13) |
| std r9, HSTATE_MMCR + 48(r13) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) |
| 31: |
| |
| /* |
| * Put whatever is in the decrementer into the |
| * hypervisor decrementer. |
| */ |
| mfspr r8,SPRN_DEC |
| mftb r7 |
| mtspr SPRN_HDEC,r8 |
| extsw r8,r8 |
| add r8,r8,r7 |
| std r8,HSTATE_DECEXP(r13) |
| |
| #ifdef CONFIG_SMP |
| /* |
| * On PPC970, if the guest vcpu has an external interrupt pending, |
| * send ourselves an IPI so as to interrupt the guest once it |
| * enables interrupts. (It must have interrupts disabled, |
| * otherwise we would already have delivered the interrupt.) |
| * |
| * XXX If this is a UP build, smp_send_reschedule is not available, |
| * so the interrupt will be delayed until the next time the vcpu |
| * enters the guest with interrupts enabled. |
| */ |
| BEGIN_FTR_SECTION |
| ld r4, HSTATE_KVM_VCPU(r13) |
| ld r0, VCPU_PENDING_EXC(r4) |
| li r7, (1 << BOOK3S_IRQPRIO_EXTERNAL) |
| oris r7, r7, (1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h |
| and. r0, r0, r7 |
| beq 32f |
| lhz r3, PACAPACAINDEX(r13) |
| bl smp_send_reschedule |
| nop |
| 32: |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| #endif /* CONFIG_SMP */ |
| |
| /* Jump to partition switch code */ |
| bl kvmppc_hv_entry_trampoline |
| nop |
| |
| /* |
| * We return here in virtual mode after the guest exits |
| * with something that we can't handle in real mode. |
| * Interrupts are enabled again at this point. |
| */ |
| |
| /* |
| * Register usage at this point: |
| * |
| * R1 = host R1 |
| * R2 = host R2 |
| * R12 = exit handler id |
| * R13 = PACA |
| */ |
| |
| /* Restore non-volatile host registers (r14 - r31) and CR */ |
| REST_NVGPRS(r1) |
| ld r4, _CCR(r1) |
| mtcr r4 |
| |
| addi r1, r1, SWITCH_FRAME_SIZE |
| ld r0, PPC_LR_STKOFF(r1) |
| mtlr r0 |
| blr |
