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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4f6c11db10
Both PR and HV KVM have separate, identical copies of the kvmppc_skip_interrupt and kvmppc_skip_Hinterrupt handlers that are used for the situation where an interrupt happens when loading the instruction that caused an exit from the guest. To eliminate this duplication and make it easier to compile in both PR and HV KVM, this moves this code to arch/powerpc/kernel/exceptions-64s.S along with other kernel interrupt handler code. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
216 lines
5.6 KiB
ArmAsm
216 lines
5.6 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/mmu.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 FUNC(name) GLUE(.,name)
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#elif defined(CONFIG_PPC_BOOK3S_32)
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#define FUNC(name) name
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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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mfspr r13, SPRN_SPRG_THREAD
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lwz r13, THREAD_KVM_SVCPU(r13)
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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 r13, 0
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bne 1f
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2: mtcr r12
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mfspr r12, SPRN_SPRG_SCRATCH1
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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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1: tophys(r13, r13)
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stw r12, HSTATE_SCRATCH1(r13)
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mfspr r12, SPRN_SPRG_SCRATCH1
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stw r12, HSTATE_SCRATCH0(r13)
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lbz r12, HSTATE_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, HSTATE_SCRATCH1(r13)
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b 2b
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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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/*
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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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* HSTATE.SCRATCH0 = guest R12
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* HSTATE.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, HSTATE_SCRATCH1(r13)
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mtcr r12
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PPC_LL r12, HSTATE_SCRATCH0(r13)
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GET_SCRATCH0(r13)
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/* And get back into the code */
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RFI
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#endif
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/*
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* Call kvmppc_handler_trampoline_enter in real mode
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*
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* On entry, r4 contains the guest shadow MSR
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* MSR.EE has to be 0 when calling this function
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*/
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_GLOBAL(kvmppc_entry_trampoline)
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mfmsr r5
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LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
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toreal(r7)
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li r6, MSR_IR | MSR_DR
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andc r6, r5, r6 /* Clear DR and IR in MSR value */
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#ifdef CONFIG_PPC_BOOK3S_32
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/*
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* Set EE in HOST_MSR so that it's enabled when we get into our
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* C exit handler function. On 64-bit we delay enabling
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* interrupts until we have finished transferring stuff
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* to or from the PACA.
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*/
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ori r5, r5, MSR_EE
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#endif
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mtsrr0 r7
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mtsrr1 r6
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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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#include "book3s_segment.S"
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