430 lines
11 KiB
ArmAsm
430 lines
11 KiB
ArmAsm
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corp. 2007
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#include <asm/ppc_asm.h>
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#include <asm/kvm_asm.h>
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#include <asm/reg.h>
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#include <asm/mmu-44x.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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#define KVMPPC_MSR_MASK (MSR_CE|MSR_EE|MSR_PR|MSR_DE|MSR_ME|MSR_IS|MSR_DS)
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#define VCPU_GPR(n) (VCPU_GPRS + (n * 4))
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/* The host stack layout: */
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#define HOST_R1 0 /* Implied by stwu. */
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#define HOST_CALLEE_LR 4
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#define HOST_RUN 8
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/* r2 is special: it holds 'current', and it made nonvolatile in the
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* kernel with the -ffixed-r2 gcc option. */
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#define HOST_R2 12
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#define HOST_NV_GPRS 16
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#define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
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#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4)
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#define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
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#define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
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#define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
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(1<<BOOKE_INTERRUPT_DTLB_MISS) | \
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(1<<BOOKE_INTERRUPT_DEBUG))
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#define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
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(1<<BOOKE_INTERRUPT_DTLB_MISS))
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#define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
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(1<<BOOKE_INTERRUPT_INST_STORAGE) | \
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(1<<BOOKE_INTERRUPT_PROGRAM) | \
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(1<<BOOKE_INTERRUPT_DTLB_MISS))
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.macro KVM_HANDLER ivor_nr
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_GLOBAL(kvmppc_handler_\ivor_nr)
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/* Get pointer to vcpu and record exit number. */
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mtspr SPRN_SPRG0, r4
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mfspr r4, SPRN_SPRG1
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stw r5, VCPU_GPR(r5)(r4)
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stw r6, VCPU_GPR(r6)(r4)
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mfctr r5
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lis r6, kvmppc_resume_host@h
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stw r5, VCPU_CTR(r4)
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li r5, \ivor_nr
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ori r6, r6, kvmppc_resume_host@l
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mtctr r6
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bctr
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.endm
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_GLOBAL(kvmppc_handlers_start)
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KVM_HANDLER BOOKE_INTERRUPT_CRITICAL
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KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK
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KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE
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KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE
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KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL
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KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT
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KVM_HANDLER BOOKE_INTERRUPT_PROGRAM
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KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL
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KVM_HANDLER BOOKE_INTERRUPT_SYSCALL
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KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL
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KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER
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KVM_HANDLER BOOKE_INTERRUPT_FIT
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KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG
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KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS
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KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS
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KVM_HANDLER BOOKE_INTERRUPT_DEBUG
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_GLOBAL(kvmppc_handler_len)
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.long kvmppc_handler_1 - kvmppc_handler_0
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/* Registers:
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* SPRG0: guest r4
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* r4: vcpu pointer
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* r5: KVM exit number
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*/
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_GLOBAL(kvmppc_resume_host)
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stw r3, VCPU_GPR(r3)(r4)
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mfcr r3
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stw r3, VCPU_CR(r4)
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stw r7, VCPU_GPR(r7)(r4)
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stw r8, VCPU_GPR(r8)(r4)
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stw r9, VCPU_GPR(r9)(r4)
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li r6, 1
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slw r6, r6, r5
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#ifdef CONFIG_KVM_EXIT_TIMING
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/* save exit time */
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1:
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mfspr r7, SPRN_TBRU
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mfspr r8, SPRN_TBRL
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mfspr r9, SPRN_TBRU
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cmpw r9, r7
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bne 1b
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stw r8, VCPU_TIMING_EXIT_TBL(r4)
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stw r9, VCPU_TIMING_EXIT_TBU(r4)
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#endif
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/* Save the faulting instruction and all GPRs for emulation. */
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andi. r7, r6, NEED_INST_MASK
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beq ..skip_inst_copy
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mfspr r9, SPRN_SRR0
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mfmsr r8
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ori r7, r8, MSR_DS
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mtmsr r7
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isync
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lwz r9, 0(r9)
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mtmsr r8
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isync
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stw r9, VCPU_LAST_INST(r4)
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stw r15, VCPU_GPR(r15)(r4)
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stw r16, VCPU_GPR(r16)(r4)
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stw r17, VCPU_GPR(r17)(r4)
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stw r18, VCPU_GPR(r18)(r4)
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stw r19, VCPU_GPR(r19)(r4)
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stw r20, VCPU_GPR(r20)(r4)
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stw r21, VCPU_GPR(r21)(r4)
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stw r22, VCPU_GPR(r22)(r4)
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stw r23, VCPU_GPR(r23)(r4)
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stw r24, VCPU_GPR(r24)(r4)
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stw r25, VCPU_GPR(r25)(r4)
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stw r26, VCPU_GPR(r26)(r4)
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stw r27, VCPU_GPR(r27)(r4)
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stw r28, VCPU_GPR(r28)(r4)
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stw r29, VCPU_GPR(r29)(r4)
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stw r30, VCPU_GPR(r30)(r4)
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stw r31, VCPU_GPR(r31)(r4)
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..skip_inst_copy:
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/* Also grab DEAR and ESR before the host can clobber them. */
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andi. r7, r6, NEED_DEAR_MASK
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beq ..skip_dear
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mfspr r9, SPRN_DEAR
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stw r9, VCPU_FAULT_DEAR(r4)
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..skip_dear:
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andi. r7, r6, NEED_ESR_MASK
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beq ..skip_esr
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mfspr r9, SPRN_ESR
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stw r9, VCPU_FAULT_ESR(r4)
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..skip_esr:
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/* Save remaining volatile guest register state to vcpu. */
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stw r0, VCPU_GPR(r0)(r4)
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stw r1, VCPU_GPR(r1)(r4)
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stw r2, VCPU_GPR(r2)(r4)
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stw r10, VCPU_GPR(r10)(r4)
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stw r11, VCPU_GPR(r11)(r4)
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stw r12, VCPU_GPR(r12)(r4)
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stw r13, VCPU_GPR(r13)(r4)
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stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */
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mflr r3
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stw r3, VCPU_LR(r4)
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mfxer r3
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stw r3, VCPU_XER(r4)
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mfspr r3, SPRN_SPRG0
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stw r3, VCPU_GPR(r4)(r4)
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mfspr r3, SPRN_SRR0
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stw r3, VCPU_PC(r4)
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/* Restore host stack pointer and PID before IVPR, since the host
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* exception handlers use them. */
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lwz r1, VCPU_HOST_STACK(r4)
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lwz r3, VCPU_HOST_PID(r4)
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mtspr SPRN_PID, r3
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/* Restore host IVPR before re-enabling interrupts. We cheat and know
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* that Linux IVPR is always 0xc0000000. */
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lis r3, 0xc000
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mtspr SPRN_IVPR, r3
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/* Switch to kernel stack and jump to handler. */
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LOAD_REG_ADDR(r3, kvmppc_handle_exit)
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mtctr r3
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lwz r3, HOST_RUN(r1)
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lwz r2, HOST_R2(r1)
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mr r14, r4 /* Save vcpu pointer. */
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bctrl /* kvmppc_handle_exit() */
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/* Restore vcpu pointer and the nonvolatiles we used. */
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mr r4, r14
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lwz r14, VCPU_GPR(r14)(r4)
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/* Sometimes instruction emulation must restore complete GPR state. */
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andi. r5, r3, RESUME_FLAG_NV
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beq ..skip_nv_load
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lwz r15, VCPU_GPR(r15)(r4)
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lwz r16, VCPU_GPR(r16)(r4)
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lwz r17, VCPU_GPR(r17)(r4)
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lwz r18, VCPU_GPR(r18)(r4)
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lwz r19, VCPU_GPR(r19)(r4)
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lwz r20, VCPU_GPR(r20)(r4)
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lwz r21, VCPU_GPR(r21)(r4)
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lwz r22, VCPU_GPR(r22)(r4)
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lwz r23, VCPU_GPR(r23)(r4)
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lwz r24, VCPU_GPR(r24)(r4)
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lwz r25, VCPU_GPR(r25)(r4)
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lwz r26, VCPU_GPR(r26)(r4)
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lwz r27, VCPU_GPR(r27)(r4)
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lwz r28, VCPU_GPR(r28)(r4)
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lwz r29, VCPU_GPR(r29)(r4)
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lwz r30, VCPU_GPR(r30)(r4)
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lwz r31, VCPU_GPR(r31)(r4)
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..skip_nv_load:
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/* Should we return to the guest? */
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andi. r5, r3, RESUME_FLAG_HOST
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beq lightweight_exit
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srawi r3, r3, 2 /* Shift -ERR back down. */
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heavyweight_exit:
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/* Not returning to guest. */
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/* We already saved guest volatile register state; now save the
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* non-volatiles. */
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stw r15, VCPU_GPR(r15)(r4)
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stw r16, VCPU_GPR(r16)(r4)
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stw r17, VCPU_GPR(r17)(r4)
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stw r18, VCPU_GPR(r18)(r4)
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stw r19, VCPU_GPR(r19)(r4)
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stw r20, VCPU_GPR(r20)(r4)
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stw r21, VCPU_GPR(r21)(r4)
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stw r22, VCPU_GPR(r22)(r4)
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stw r23, VCPU_GPR(r23)(r4)
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stw r24, VCPU_GPR(r24)(r4)
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stw r25, VCPU_GPR(r25)(r4)
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stw r26, VCPU_GPR(r26)(r4)
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stw r27, VCPU_GPR(r27)(r4)
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stw r28, VCPU_GPR(r28)(r4)
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stw r29, VCPU_GPR(r29)(r4)
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stw r30, VCPU_GPR(r30)(r4)
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stw r31, VCPU_GPR(r31)(r4)
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/* Load host non-volatile register state from host stack. */
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lwz r14, HOST_NV_GPR(r14)(r1)
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lwz r15, HOST_NV_GPR(r15)(r1)
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lwz r16, HOST_NV_GPR(r16)(r1)
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lwz r17, HOST_NV_GPR(r17)(r1)
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lwz r18, HOST_NV_GPR(r18)(r1)
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lwz r19, HOST_NV_GPR(r19)(r1)
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lwz r20, HOST_NV_GPR(r20)(r1)
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lwz r21, HOST_NV_GPR(r21)(r1)
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lwz r22, HOST_NV_GPR(r22)(r1)
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lwz r23, HOST_NV_GPR(r23)(r1)
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lwz r24, HOST_NV_GPR(r24)(r1)
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lwz r25, HOST_NV_GPR(r25)(r1)
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lwz r26, HOST_NV_GPR(r26)(r1)
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lwz r27, HOST_NV_GPR(r27)(r1)
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lwz r28, HOST_NV_GPR(r28)(r1)
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lwz r29, HOST_NV_GPR(r29)(r1)
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lwz r30, HOST_NV_GPR(r30)(r1)
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lwz r31, HOST_NV_GPR(r31)(r1)
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/* Return to kvm_vcpu_run(). */
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lwz r4, HOST_STACK_LR(r1)
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addi r1, r1, HOST_STACK_SIZE
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mtlr r4
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/* r3 still contains the return code from kvmppc_handle_exit(). */
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blr
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/* Registers:
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* r3: kvm_run pointer
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* r4: vcpu pointer
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*/
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_GLOBAL(__kvmppc_vcpu_run)
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stwu r1, -HOST_STACK_SIZE(r1)
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stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
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/* Save host state to stack. */
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stw r3, HOST_RUN(r1)
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mflr r3
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stw r3, HOST_STACK_LR(r1)
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/* Save host non-volatile register state to stack. */
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stw r14, HOST_NV_GPR(r14)(r1)
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stw r15, HOST_NV_GPR(r15)(r1)
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stw r16, HOST_NV_GPR(r16)(r1)
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stw r17, HOST_NV_GPR(r17)(r1)
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stw r18, HOST_NV_GPR(r18)(r1)
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stw r19, HOST_NV_GPR(r19)(r1)
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stw r20, HOST_NV_GPR(r20)(r1)
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stw r21, HOST_NV_GPR(r21)(r1)
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stw r22, HOST_NV_GPR(r22)(r1)
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stw r23, HOST_NV_GPR(r23)(r1)
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stw r24, HOST_NV_GPR(r24)(r1)
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stw r25, HOST_NV_GPR(r25)(r1)
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stw r26, HOST_NV_GPR(r26)(r1)
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stw r27, HOST_NV_GPR(r27)(r1)
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stw r28, HOST_NV_GPR(r28)(r1)
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stw r29, HOST_NV_GPR(r29)(r1)
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stw r30, HOST_NV_GPR(r30)(r1)
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stw r31, HOST_NV_GPR(r31)(r1)
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/* Load guest non-volatiles. */
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lwz r14, VCPU_GPR(r14)(r4)
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lwz r15, VCPU_GPR(r15)(r4)
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lwz r16, VCPU_GPR(r16)(r4)
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lwz r17, VCPU_GPR(r17)(r4)
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lwz r18, VCPU_GPR(r18)(r4)
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lwz r19, VCPU_GPR(r19)(r4)
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lwz r20, VCPU_GPR(r20)(r4)
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lwz r21, VCPU_GPR(r21)(r4)
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lwz r22, VCPU_GPR(r22)(r4)
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lwz r23, VCPU_GPR(r23)(r4)
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lwz r24, VCPU_GPR(r24)(r4)
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lwz r25, VCPU_GPR(r25)(r4)
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lwz r26, VCPU_GPR(r26)(r4)
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lwz r27, VCPU_GPR(r27)(r4)
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lwz r28, VCPU_GPR(r28)(r4)
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lwz r29, VCPU_GPR(r29)(r4)
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lwz r30, VCPU_GPR(r30)(r4)
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lwz r31, VCPU_GPR(r31)(r4)
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lightweight_exit:
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stw r2, HOST_R2(r1)
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mfspr r3, SPRN_PID
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stw r3, VCPU_HOST_PID(r4)
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lwz r3, VCPU_SHADOW_PID(r4)
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mtspr SPRN_PID, r3
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#ifdef CONFIG_44x
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iccci 0, 0 /* XXX hack */
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#endif
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/* Load some guest volatiles. */
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lwz r0, VCPU_GPR(r0)(r4)
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lwz r2, VCPU_GPR(r2)(r4)
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lwz r9, VCPU_GPR(r9)(r4)
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lwz r10, VCPU_GPR(r10)(r4)
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lwz r11, VCPU_GPR(r11)(r4)
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lwz r12, VCPU_GPR(r12)(r4)
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lwz r13, VCPU_GPR(r13)(r4)
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lwz r3, VCPU_LR(r4)
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mtlr r3
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lwz r3, VCPU_XER(r4)
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mtxer r3
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/* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
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* so how do we make sure vcpu won't fault? */
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lis r8, kvmppc_booke_handlers@ha
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lwz r8, kvmppc_booke_handlers@l(r8)
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mtspr SPRN_IVPR, r8
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/* Save vcpu pointer for the exception handlers. */
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mtspr SPRN_SPRG1, r4
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/* Can't switch the stack pointer until after IVPR is switched,
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* because host interrupt handlers would get confused. */
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lwz r1, VCPU_GPR(r1)(r4)
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/* XXX handle USPRG0 */
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/* Host interrupt handlers may have clobbered these guest-readable
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* SPRGs, so we need to reload them here with the guest's values. */
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lwz r3, VCPU_SPRG4(r4)
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mtspr SPRN_SPRG4, r3
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lwz r3, VCPU_SPRG5(r4)
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mtspr SPRN_SPRG5, r3
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lwz r3, VCPU_SPRG6(r4)
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mtspr SPRN_SPRG6, r3
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lwz r3, VCPU_SPRG7(r4)
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mtspr SPRN_SPRG7, r3
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#ifdef CONFIG_KVM_EXIT_TIMING
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/* save enter time */
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1:
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mfspr r6, SPRN_TBRU
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mfspr r7, SPRN_TBRL
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mfspr r8, SPRN_TBRU
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cmpw r8, r6
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bne 1b
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stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4)
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stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4)
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#endif
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/* Finish loading guest volatiles and jump to guest. */
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lwz r3, VCPU_CTR(r4)
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mtctr r3
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lwz r3, VCPU_CR(r4)
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mtcr r3
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lwz r5, VCPU_GPR(r5)(r4)
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lwz r6, VCPU_GPR(r6)(r4)
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lwz r7, VCPU_GPR(r7)(r4)
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lwz r8, VCPU_GPR(r8)(r4)
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lwz r3, VCPU_PC(r4)
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|
mtsrr0 r3
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lwz r3, VCPU_MSR(r4)
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oris r3, r3, KVMPPC_MSR_MASK@h
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|
ori r3, r3, KVMPPC_MSR_MASK@l
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|
mtsrr1 r3
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/* Clear any debug events which occurred since we disabled MSR[DE].
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|
* XXX This gives us a 3-instruction window in which a breakpoint
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|
* intended for guest context could fire in the host instead. */
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|
lis r3, 0xffff
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ori r3, r3, 0xffff
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|
mtspr SPRN_DBSR, r3
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|
|
|
lwz r3, VCPU_GPR(r3)(r4)
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|
lwz r4, VCPU_GPR(r4)(r4)
|
|
rfi
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