diff options
Diffstat (limited to 'arch/powerpc/kvm/booke_host.c')
| -rw-r--r-- | arch/powerpc/kvm/booke_host.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/booke_host.c b/arch/powerpc/kvm/booke_host.c new file mode 100644 index 000000000000..b480341bc31e --- /dev/null +++ b/arch/powerpc/kvm/booke_host.c @@ -0,0 +1,83 @@ +/* + * 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 IBM Corp. 2008 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#include <linux/errno.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <asm/cacheflush.h> +#include <asm/kvm_ppc.h> + +unsigned long kvmppc_booke_handlers; + +static int kvmppc_booke_init(void) +{ + unsigned long ivor[16]; + unsigned long max_ivor = 0; + int i; + + /* We install our own exception handlers by hijacking IVPR. IVPR must + * be 16-bit aligned, so we need a 64KB allocation. */ + kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO, + VCPU_SIZE_ORDER); + if (!kvmppc_booke_handlers) + return -ENOMEM; + + /* XXX make sure our handlers are smaller than Linux's */ + + /* Copy our interrupt handlers to match host IVORs. That way we don't + * have to swap the IVORs on every guest/host transition. */ + ivor[0] = mfspr(SPRN_IVOR0); + ivor[1] = mfspr(SPRN_IVOR1); + ivor[2] = mfspr(SPRN_IVOR2); + ivor[3] = mfspr(SPRN_IVOR3); + ivor[4] = mfspr(SPRN_IVOR4); + ivor[5] = mfspr(SPRN_IVOR5); + ivor[6] = mfspr(SPRN_IVOR6); + ivor[7] = mfspr(SPRN_IVOR7); + ivor[8] = mfspr(SPRN_IVOR8); + ivor[9] = mfspr(SPRN_IVOR9); + ivor[10] = mfspr(SPRN_IVOR10); + ivor[11] = mfspr(SPRN_IVOR11); + ivor[12] = mfspr(SPRN_IVOR12); + ivor[13] = mfspr(SPRN_IVOR13); + ivor[14] = mfspr(SPRN_IVOR14); + ivor[15] = mfspr(SPRN_IVOR15); + + for (i = 0; i < 16; i++) { + if (ivor[i] > max_ivor) + max_ivor = ivor[i]; + + memcpy((void *)kvmppc_booke_handlers + ivor[i], + kvmppc_handlers_start + i * kvmppc_handler_len, + kvmppc_handler_len); + } + flush_icache_range(kvmppc_booke_handlers, + kvmppc_booke_handlers + max_ivor + kvmppc_handler_len); + + return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE); +} + +static void __exit kvmppc_booke_exit(void) +{ + free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER); + kvm_exit(); +} + +module_init(kvmppc_booke_init) +module_exit(kvmppc_booke_exit) |