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- /*
- * 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 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>
- #if defined(CONFIG_PPC_BOOK3S_64)
- #if defined(_CALL_ELF) && _CALL_ELF == 2
- #define FUNC(name) name
- #else
- #define FUNC(name) GLUE(.,name)
- #endif
- #define GET_SHADOW_VCPU(reg) addi reg, r13, PACA_SVCPU
- #elif defined(CONFIG_PPC_BOOK3S_32)
- #define FUNC(name) name
- #define GET_SHADOW_VCPU(reg) lwz reg, (THREAD + THREAD_KVM_SVCPU)(r2)
- #endif /* CONFIG_PPC_BOOK3S_XX */
- #define VCPU_LOAD_NVGPRS(vcpu) \
- PPC_LL r14, VCPU_GPR(R14)(vcpu); \
- PPC_LL r15, VCPU_GPR(R15)(vcpu); \
- PPC_LL r16, VCPU_GPR(R16)(vcpu); \
- PPC_LL r17, VCPU_GPR(R17)(vcpu); \
- PPC_LL r18, VCPU_GPR(R18)(vcpu); \
- PPC_LL r19, VCPU_GPR(R19)(vcpu); \
- PPC_LL r20, VCPU_GPR(R20)(vcpu); \
- PPC_LL r21, VCPU_GPR(R21)(vcpu); \
- PPC_LL r22, VCPU_GPR(R22)(vcpu); \
- PPC_LL r23, VCPU_GPR(R23)(vcpu); \
- PPC_LL r24, VCPU_GPR(R24)(vcpu); \
- PPC_LL r25, VCPU_GPR(R25)(vcpu); \
- PPC_LL r26, VCPU_GPR(R26)(vcpu); \
- PPC_LL r27, VCPU_GPR(R27)(vcpu); \
- PPC_LL r28, VCPU_GPR(R28)(vcpu); \
- PPC_LL r29, VCPU_GPR(R29)(vcpu); \
- PPC_LL r30, VCPU_GPR(R30)(vcpu); \
- PPC_LL r31, VCPU_GPR(R31)(vcpu); \
- /*****************************************************************************
- * *
- * Guest entry / exit code that is in kernel module memory (highmem) *
- * *
- ****************************************************************************/
- /* Registers:
- * r3: kvm_run pointer
- * r4: vcpu pointer
- */
- _GLOBAL(__kvmppc_vcpu_run)
- kvm_start_entry:
- /* Write correct stack frame */
- mflr r0
- PPC_STL r0,PPC_LR_STKOFF(r1)
- /* Save host state to the stack */
- PPC_STLU r1, -SWITCH_FRAME_SIZE(r1)
- /* Save r3 (kvm_run) and r4 (vcpu) */
- SAVE_2GPRS(3, r1)
- /* Save non-volatile registers (r14 - r31) */
- SAVE_NVGPRS(r1)
- /* Save CR */
- mfcr r14
- stw r14, _CCR(r1)
- /* Save LR */
- PPC_STL r0, _LINK(r1)
- /* Load non-volatile guest state from the vcpu */
- VCPU_LOAD_NVGPRS(r4)
- kvm_start_lightweight:
- /* Copy registers into shadow vcpu so we can access them in real mode */
- GET_SHADOW_VCPU(r3)
- bl FUNC(kvmppc_copy_to_svcpu)
- nop
- REST_GPR(4, r1)
- #ifdef CONFIG_PPC_BOOK3S_64
- /* Get the dcbz32 flag */
- PPC_LL r3, VCPU_HFLAGS(r4)
- rldicl r3, r3, 0, 63 /* r3 &= 1 */
- stb r3, HSTATE_RESTORE_HID5(r13)
- /* Load up guest SPRG3 value, since it's user readable */
- lwz r3, VCPU_SHAREDBE(r4)
- cmpwi r3, 0
- ld r5, VCPU_SHARED(r4)
- beq sprg3_little_endian
- sprg3_big_endian:
- #ifdef __BIG_ENDIAN__
- ld r3, VCPU_SHARED_SPRG3(r5)
- #else
- addi r5, r5, VCPU_SHARED_SPRG3
- ldbrx r3, 0, r5
- #endif
- b after_sprg3_load
- sprg3_little_endian:
- #ifdef __LITTLE_ENDIAN__
- ld r3, VCPU_SHARED_SPRG3(r5)
- #else
- addi r5, r5, VCPU_SHARED_SPRG3
- ldbrx r3, 0, r5
- #endif
- after_sprg3_load:
- mtspr SPRN_SPRG3, r3
- #endif /* CONFIG_PPC_BOOK3S_64 */
- PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */
- /* Jump to segment patching handler and into our guest */
- bl FUNC(kvmppc_entry_trampoline)
- nop
- /*
- * This is the handler in module memory. It gets jumped at from the
- * lowmem trampoline code, so it's basically the guest exit code.
- *
- */
- /*
- * Register usage at this point:
- *
- * R1 = host R1
- * R2 = host R2
- * R12 = exit handler id
- * R13 = PACA
- * SVCPU.* = guest *
- * MSR.EE = 1
- *
- */
- PPC_LL r3, GPR4(r1) /* vcpu pointer */
- /*
- * kvmppc_copy_from_svcpu can clobber volatile registers, save
- * the exit handler id to the vcpu and restore it from there later.
- */
- stw r12, VCPU_TRAP(r3)
- /* Transfer reg values from shadow vcpu back to vcpu struct */
- /* On 64-bit, interrupts are still off at this point */
- GET_SHADOW_VCPU(r4)
- bl FUNC(kvmppc_copy_from_svcpu)
- nop
- #ifdef CONFIG_PPC_BOOK3S_64
- /*
- * Reload kernel SPRG3 value.
- * No need to save guest value as usermode can't modify SPRG3.
- */
- ld r3, PACA_SPRG_VDSO(r13)
- mtspr SPRN_SPRG_VDSO_WRITE, r3
- #endif /* CONFIG_PPC_BOOK3S_64 */
- /* R7 = vcpu */
- PPC_LL r7, GPR4(r1)
- PPC_STL r14, VCPU_GPR(R14)(r7)
- PPC_STL r15, VCPU_GPR(R15)(r7)
- PPC_STL r16, VCPU_GPR(R16)(r7)
- PPC_STL r17, VCPU_GPR(R17)(r7)
- PPC_STL r18, VCPU_GPR(R18)(r7)
- PPC_STL r19, VCPU_GPR(R19)(r7)
- PPC_STL r20, VCPU_GPR(R20)(r7)
- PPC_STL r21, VCPU_GPR(R21)(r7)
- PPC_STL r22, VCPU_GPR(R22)(r7)
- PPC_STL r23, VCPU_GPR(R23)(r7)
- PPC_STL r24, VCPU_GPR(R24)(r7)
- PPC_STL r25, VCPU_GPR(R25)(r7)
- PPC_STL r26, VCPU_GPR(R26)(r7)
- PPC_STL r27, VCPU_GPR(R27)(r7)
- PPC_STL r28, VCPU_GPR(R28)(r7)
- PPC_STL r29, VCPU_GPR(R29)(r7)
- PPC_STL r30, VCPU_GPR(R30)(r7)
- PPC_STL r31, VCPU_GPR(R31)(r7)
- /* Pass the exit number as 3rd argument to kvmppc_handle_exit */
- lwz r5, VCPU_TRAP(r7)
- /* Restore r3 (kvm_run) and r4 (vcpu) */
- REST_2GPRS(3, r1)
- bl FUNC(kvmppc_handle_exit_pr)
- /* If RESUME_GUEST, get back in the loop */
- cmpwi r3, RESUME_GUEST
- beq kvm_loop_lightweight
- cmpwi r3, RESUME_GUEST_NV
- beq kvm_loop_heavyweight
- kvm_exit_loop:
- PPC_LL r4, _LINK(r1)
- mtlr r4
- lwz r14, _CCR(r1)
- mtcr r14
- /* Restore non-volatile host registers (r14 - r31) */
- REST_NVGPRS(r1)
- addi r1, r1, SWITCH_FRAME_SIZE
- blr
- kvm_loop_heavyweight:
- PPC_LL r4, _LINK(r1)
- PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1)
- /* Load vcpu and cpu_run */
- REST_2GPRS(3, r1)
- /* Load non-volatile guest state from the vcpu */
- VCPU_LOAD_NVGPRS(r4)
- /* Jump back into the beginning of this function */
- b kvm_start_lightweight
- kvm_loop_lightweight:
- /* We'll need the vcpu pointer */
- REST_GPR(4, r1)
- /* Jump back into the beginning of this function */
- b kvm_start_lightweight
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