Getting from host state to the guest is only half the story. We also need to return to our host context and handle whatever happened to get us out of the guest. On PowerPC every guest exit is an interrupt. So all we need to do is trap the host's interrupt handlers and get into our #VMEXIT code to handle it. PowerPCs also have a register that can add an offset to the interrupt handlers' adresses which is what the booke KVM code uses. Unfortunately that is a hypervisor ressource and we also want to be able to run KVM when we're running in an LPAR. So we have to hook into the Linux interrupt handlers. Signed-off-by: Alexander Graf <agraf@xxxxxxx> --- arch/powerpc/kvm/book3s_64_rmhandlers.S | 133 +++++++++++++++++++++++++++++++ 1 files changed, 133 insertions(+), 0 deletions(-) create mode 100644 arch/powerpc/kvm/book3s_64_rmhandlers.S diff --git a/arch/powerpc/kvm/book3s_64_rmhandlers.S b/arch/powerpc/kvm/book3s_64_rmhandlers.S new file mode 100644 index 0000000..cb70dfd --- /dev/null +++ b/arch/powerpc/kvm/book3s_64_rmhandlers.S @@ -0,0 +1,133 @@ +/* + * 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@xxxxxxx> + */ + +#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.h> + +/***************************************************************************** + * * + * Real Mode handlers that need to be in low physical memory * + * * + ****************************************************************************/ + + +.macro INTERRUPT_TRAMPOLINE intno + +.global kvmppc_trampoline_\intno +kvmppc_trampoline_\intno: + /* We're replacing this instruction in the real handler */ + mtspr SPRN_SPRG1, 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 only need to check SPRG3 (PACA), + * because our entry code sets SPRG3 = PACA | 1, while + * Linux has the PACA on at least word boundary. + */ + mfcr r13 + mtspr SPRN_SPRG2, r13 /* Save CR */ + mfspr r13, SPRN_SPRG3 /* r13 = PACA | 1 */ + clrldi. r13, r13, 63 /* CR = ((r13 & 1) == 0) */ + bne ..kvmppc_handler_hasmagic_\intno + /* No KVM guest? Then jump back to the Linux handler! */ + mfspr r13, SPRN_SPRG2 + mtcr r13 + mfspr r13, SPRN_SPRG1 /* r13 = original r13 */ + b kvmppc_resume_\intno /* Get back original handler */ + + /* Now we know we're handling a KVM guest */ +..kvmppc_handler_hasmagic_\intno: + /* Unset SPRG3 */ + mfspr r13, SPRN_SPRG3 /* r13 = PACA */ + clrrdi r13, r13, 1 /* r13 &= ~1 */ + mtspr SPRN_SPRG3, r13 /* SPRG3 = PACA & ~1 */ + + /* As of here PACA is in r13 and we're safe to do something */ + + std r1, (PACA_EXMC+EX_R9)(r13) + std r10, (PACA_EXMC+EX_R10)(r13) + std r11, (PACA_EXMC+EX_R11)(r13) + std r12, (PACA_EXMC+EX_R12)(r13) + std r2, (PACA_EXMC+EX_R13)(r13) + + mfsrr0 r10 + mfsrr1 r11 + + /* Restore R1/R2 so we can handle faults */ + ld r1, PACAR1(r13) + ld r2, (PACA_EXMC+EX_SRR0)(r13) + + /* 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_DATA_SEGMENT +INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE +INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_SEGMENT +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 +INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_VSX + +/* + * This trampoline brings us back to a real mode handler + * + * Input Registers: + * + * R6 = SRR0 + * R7 = SRR1 + * LR = real-mode IP + * + */ +.global kvmppc_handler_lowmem_trampoline +kvmppc_handler_lowmem_trampoline: + + mtsrr0 r6 + mtsrr1 r7 + blr +kvmppc_handler_lowmem_trampoline_end: + +.global kvmppc_trampoline_lowmem +kvmppc_trampoline_lowmem: + .long kvmppc_handler_lowmem_trampoline - _stext + +.global kvmppc_trampoline_enter +kvmppc_trampoline_enter: + .long kvmppc_handler_trampoline_enter - _stext + +#include "book3s_64_slb.S" + -- 1.6.0.2 -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
