/* * 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/mmu.h> #include <asm/page.h> #include <asm/asm-offsets.h> #ifdef CONFIG_PPC_BOOK3S_64 #include <asm/exception-64s.h> #endif /***************************************************************************** * * * Real Mode handlers that need to be in low physical memory * * * ****************************************************************************/ #if defined(CONFIG_PPC_BOOK3S_64) #define FUNC(name) GLUE(.,name) .globl kvmppc_skip_interrupt kvmppc_skip_interrupt: /* * Here all GPRs are unchanged from when the interrupt happened * except for r13, which is saved in SPRG_SCRATCH0. */ mfspr r13, SPRN_SRR0 addi r13, r13, 4 mtspr SPRN_SRR0, r13 GET_SCRATCH0(r13) rfid b . .globl kvmppc_skip_Hinterrupt kvmppc_skip_Hinterrupt: /* * Here all GPRs are unchanged from when the interrupt happened * except for r13, which is saved in SPRG_SCRATCH0. */ mfspr r13, SPRN_HSRR0 addi r13, r13, 4 mtspr SPRN_HSRR0, r13 GET_SCRATCH0(r13) hrfid b . #elif defined(CONFIG_PPC_BOOK3S_32) #define FUNC(name) name .macro INTERRUPT_TRAMPOLINE intno .global kvmppc_trampoline_\intno kvmppc_trampoline_\intno: mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */ /* * First thing to do is to find out if we're coming * from a KVM guest or a Linux process. * * To distinguish, we check a magic byte in the PACA/current */ mfspr r13, SPRN_SPRG_THREAD lwz r13, THREAD_KVM_SVCPU(r13) /* PPC32 can have a NULL pointer - let's check for that */ mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */ mfcr r12 cmpwi r13, 0 bne 1f 2: mtcr r12 mfspr r12, SPRN_SPRG_SCRATCH1 mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */ b kvmppc_resume_\intno /* Get back original handler */ 1: tophys(r13, r13) stw r12, HSTATE_SCRATCH1(r13) mfspr r12, SPRN_SPRG_SCRATCH1 stw r12, HSTATE_SCRATCH0(r13) lbz r12, HSTATE_IN_GUEST(r13) cmpwi r12, KVM_GUEST_MODE_NONE bne ..kvmppc_handler_hasmagic_\intno /* No KVM guest? Then jump back to the Linux handler! */ lwz r12, HSTATE_SCRATCH1(r13) b 2b /* Now we know we're handling a KVM guest */ ..kvmppc_handler_hasmagic_\intno: /* Should we just skip the faulting instruction? */ cmpwi r12, KVM_GUEST_MODE_SKIP beq kvmppc_handler_skip_ins /* Let's store which interrupt we're handling */ li r12, \intno /* Jump into the SLB exit code that goes to the highmem handler */ b kvmppc_handler_trampoline_exit .endm INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC /* * Bring us back to the faulting code, but skip the * faulting instruction. * * This is a generic exit path from the interrupt * trampolines above. * * Input Registers: * * R12 = free * R13 = Shadow VCPU (PACA) * HSTATE.SCRATCH0 = guest R12 * HSTATE.SCRATCH1 = guest CR * SPRG_SCRATCH0 = guest R13 * */ kvmppc_handler_skip_ins: /* Patch the IP to the next instruction */ mfsrr0 r12 addi r12, r12, 4 mtsrr0 r12 /* Clean up all state */ lwz r12, HSTATE_SCRATCH1(r13) mtcr r12 PPC_LL r12, HSTATE_SCRATCH0(r13) GET_SCRATCH0(r13) /* And get back into the code */ RFI #endif /* * Call kvmppc_handler_trampoline_enter in real mode * * On entry, r4 contains the guest shadow MSR * MSR.EE has to be 0 when calling this function */ _GLOBAL(kvmppc_entry_trampoline) mfmsr r5 LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter) toreal(r7) li r6, MSR_IR | MSR_DR andc r6, r5, r6 /* Clear DR and IR in MSR value */ /* * Set EE in HOST_MSR so that it's enabled when we get into our * C exit handler function */ ori r5, r5, MSR_EE mtsrr0 r7 mtsrr1 r6 RFI #if defined(CONFIG_PPC_BOOK3S_32) #define STACK_LR INT_FRAME_SIZE+4 /* load_up_xxx have to run with MSR_DR=0 on Book3S_32 */ #define MSR_EXT_START \ PPC_STL r20, _NIP(r1); \ mfmsr r20; \ LOAD_REG_IMMEDIATE(r3, MSR_DR|MSR_EE); \ andc r3,r20,r3; /* Disable DR,EE */ \ mtmsr r3; \ sync #define MSR_EXT_END \ mtmsr r20; /* Enable DR,EE */ \ sync; \ PPC_LL r20, _NIP(r1) #elif defined(CONFIG_PPC_BOOK3S_64) #define STACK_LR _LINK #define MSR_EXT_START #define MSR_EXT_END #endif /* * Activate current's external feature (FPU/Altivec/VSX) */ #define define_load_up(what) \ \ _GLOBAL(kvmppc_load_up_ ## what); \ PPC_STLU r1, -INT_FRAME_SIZE(r1); \ mflr r3; \ PPC_STL r3, STACK_LR(r1); \ MSR_EXT_START; \ \ bl FUNC(load_up_ ## what); \ \ MSR_EXT_END; \ PPC_LL r3, STACK_LR(r1); \ mtlr r3; \ addi r1, r1, INT_FRAME_SIZE; \ blr define_load_up(fpu) #ifdef CONFIG_ALTIVEC define_load_up(altivec) #endif #include "book3s_segment.S"