forked from Minki/linux
2dd60d79e0
When running in Hypervisor mode (arch 2.06 or later), we store the PACA in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be lost during a "nap" power management operation (though they aren't currently on POWER7) and this enables use of SPRG1 by KVM guests. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
260 lines
6.7 KiB
ArmAsm
260 lines
6.7 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 SUSE Linux Products GmbH 2009
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*
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* Authors: Alexander Graf <agraf@suse.de>
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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/page.h>
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#include <asm/asm-offsets.h>
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#ifdef CONFIG_PPC_BOOK3S_64
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#include <asm/exception-64s.h>
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#endif
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/*****************************************************************************
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* *
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* Real Mode handlers that need to be in low physical memory *
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* *
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****************************************************************************/
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#if defined(CONFIG_PPC_BOOK3S_64)
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#define LOAD_SHADOW_VCPU(reg) GET_PACA(reg)
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#define SHADOW_VCPU_OFF PACA_KVM_SVCPU
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#define MSR_NOIRQ MSR_KERNEL & ~(MSR_IR | MSR_DR)
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#define FUNC(name) GLUE(.,name)
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#elif defined(CONFIG_PPC_BOOK3S_32)
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#define LOAD_SHADOW_VCPU(reg) \
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mfspr reg, SPRN_SPRG_THREAD; \
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lwz reg, THREAD_KVM_SVCPU(reg); \
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/* PPC32 can have a NULL pointer - let's check for that */ \
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mtspr SPRN_SPRG_SCRATCH1, r12; /* Save r12 */ \
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mfcr r12; \
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cmpwi reg, 0; \
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bne 1f; \
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mfspr reg, SPRN_SPRG_SCRATCH0; \
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mtcr r12; \
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mfspr r12, SPRN_SPRG_SCRATCH1; \
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b kvmppc_resume_\intno; \
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1:; \
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mtcr r12; \
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mfspr r12, SPRN_SPRG_SCRATCH1; \
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tophys(reg, reg)
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#define SHADOW_VCPU_OFF 0
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#define MSR_NOIRQ MSR_KERNEL
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#define FUNC(name) name
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#endif
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.macro INTERRUPT_TRAMPOLINE intno
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.global kvmppc_trampoline_\intno
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kvmppc_trampoline_\intno:
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mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
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/*
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* First thing to do is to find out if we're coming
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* from a KVM guest or a Linux process.
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*
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* To distinguish, we check a magic byte in the PACA/current
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*/
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LOAD_SHADOW_VCPU(r13)
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PPC_STL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
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mfcr r12
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stw r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
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lbz r12, (SHADOW_VCPU_OFF + SVCPU_IN_GUEST)(r13)
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cmpwi r12, KVM_GUEST_MODE_NONE
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bne ..kvmppc_handler_hasmagic_\intno
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/* No KVM guest? Then jump back to the Linux handler! */
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lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
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mtcr r12
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PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
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mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
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b kvmppc_resume_\intno /* Get back original handler */
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/* Now we know we're handling a KVM guest */
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..kvmppc_handler_hasmagic_\intno:
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/* Should we just skip the faulting instruction? */
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cmpwi r12, KVM_GUEST_MODE_SKIP
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beq kvmppc_handler_skip_ins
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/* Let's store which interrupt we're handling */
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li r12, \intno
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/* Jump into the SLB exit code that goes to the highmem handler */
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b kvmppc_handler_trampoline_exit
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.endm
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
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/* Those are only available on 64 bit machines */
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#ifdef CONFIG_PPC_BOOK3S_64
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_SEGMENT
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_SEGMENT
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_VSX
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#endif
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/*
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* Bring us back to the faulting code, but skip the
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* faulting instruction.
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*
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* This is a generic exit path from the interrupt
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* trampolines above.
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*
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* Input Registers:
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*
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* R12 = free
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* R13 = Shadow VCPU (PACA)
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* SVCPU.SCRATCH0 = guest R12
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* SVCPU.SCRATCH1 = guest CR
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* SPRG_SCRATCH0 = guest R13
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*
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*/
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kvmppc_handler_skip_ins:
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/* Patch the IP to the next instruction */
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mfsrr0 r12
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addi r12, r12, 4
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mtsrr0 r12
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/* Clean up all state */
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lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
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mtcr r12
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PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
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mfspr r13, SPRN_SPRG_SCRATCH0
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/* And get back into the code */
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RFI
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/*
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* This trampoline brings us back to a real mode handler
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*
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* Input Registers:
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*
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* R5 = SRR0
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* R6 = SRR1
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* LR = real-mode IP
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*
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*/
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.global kvmppc_handler_lowmem_trampoline
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kvmppc_handler_lowmem_trampoline:
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mtsrr0 r5
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mtsrr1 r6
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blr
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kvmppc_handler_lowmem_trampoline_end:
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/*
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* Call a function in real mode
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*
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* Input Registers:
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*
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* R3 = function
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* R4 = MSR
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* R5 = scratch register
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*
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*/
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_GLOBAL(kvmppc_rmcall)
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LOAD_REG_IMMEDIATE(r5, MSR_NOIRQ)
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mtmsr r5 /* Disable relocation and interrupts, so mtsrr
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doesn't get interrupted */
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sync
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mtsrr0 r3
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mtsrr1 r4
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RFI
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#if defined(CONFIG_PPC_BOOK3S_32)
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#define STACK_LR INT_FRAME_SIZE+4
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/* load_up_xxx have to run with MSR_DR=0 on Book3S_32 */
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#define MSR_EXT_START \
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PPC_STL r20, _NIP(r1); \
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mfmsr r20; \
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LOAD_REG_IMMEDIATE(r3, MSR_DR|MSR_EE); \
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andc r3,r20,r3; /* Disable DR,EE */ \
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mtmsr r3; \
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sync
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#define MSR_EXT_END \
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mtmsr r20; /* Enable DR,EE */ \
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sync; \
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PPC_LL r20, _NIP(r1)
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#elif defined(CONFIG_PPC_BOOK3S_64)
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#define STACK_LR _LINK
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#define MSR_EXT_START
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#define MSR_EXT_END
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#endif
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/*
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* Activate current's external feature (FPU/Altivec/VSX)
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*/
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#define define_load_up(what) \
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\
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_GLOBAL(kvmppc_load_up_ ## what); \
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PPC_STLU r1, -INT_FRAME_SIZE(r1); \
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mflr r3; \
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PPC_STL r3, STACK_LR(r1); \
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MSR_EXT_START; \
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\
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bl FUNC(load_up_ ## what); \
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\
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MSR_EXT_END; \
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PPC_LL r3, STACK_LR(r1); \
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mtlr r3; \
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addi r1, r1, INT_FRAME_SIZE; \
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blr
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define_load_up(fpu)
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#ifdef CONFIG_ALTIVEC
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define_load_up(altivec)
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#endif
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#ifdef CONFIG_VSX
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define_load_up(vsx)
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#endif
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.global kvmppc_trampoline_lowmem
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kvmppc_trampoline_lowmem:
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PPC_LONG kvmppc_handler_lowmem_trampoline - CONFIG_KERNEL_START
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.global kvmppc_trampoline_enter
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kvmppc_trampoline_enter:
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PPC_LONG kvmppc_handler_trampoline_enter - CONFIG_KERNEL_START
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#include "book3s_segment.S"
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