bbf45ba57e
This functionality is definitely experimental, but is capable of running unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only tested with 440EP "Bamboo" guests so far, but with appropriate userspace support other SoC/board combinations should work.) See Documentation/powerpc/kvm_440.txt for technical details. [stephen: build fix] Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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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 IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#include <linux/errno.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <asm/cacheflush.h>
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#include <asm/kvm_ppc.h>
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unsigned long kvmppc_booke_handlers;
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static int kvmppc_booke_init(void)
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{
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unsigned long ivor[16];
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unsigned long max_ivor = 0;
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int i;
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/* We install our own exception handlers by hijacking IVPR. IVPR must
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* be 16-bit aligned, so we need a 64KB allocation. */
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kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
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VCPU_SIZE_ORDER);
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if (!kvmppc_booke_handlers)
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return -ENOMEM;
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/* XXX make sure our handlers are smaller than Linux's */
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/* Copy our interrupt handlers to match host IVORs. That way we don't
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* have to swap the IVORs on every guest/host transition. */
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ivor[0] = mfspr(SPRN_IVOR0);
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ivor[1] = mfspr(SPRN_IVOR1);
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ivor[2] = mfspr(SPRN_IVOR2);
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ivor[3] = mfspr(SPRN_IVOR3);
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ivor[4] = mfspr(SPRN_IVOR4);
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ivor[5] = mfspr(SPRN_IVOR5);
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ivor[6] = mfspr(SPRN_IVOR6);
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ivor[7] = mfspr(SPRN_IVOR7);
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ivor[8] = mfspr(SPRN_IVOR8);
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ivor[9] = mfspr(SPRN_IVOR9);
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ivor[10] = mfspr(SPRN_IVOR10);
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ivor[11] = mfspr(SPRN_IVOR11);
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ivor[12] = mfspr(SPRN_IVOR12);
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ivor[13] = mfspr(SPRN_IVOR13);
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ivor[14] = mfspr(SPRN_IVOR14);
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ivor[15] = mfspr(SPRN_IVOR15);
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for (i = 0; i < 16; i++) {
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if (ivor[i] > max_ivor)
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max_ivor = ivor[i];
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memcpy((void *)kvmppc_booke_handlers + ivor[i],
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kvmppc_handlers_start + i * kvmppc_handler_len,
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kvmppc_handler_len);
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}
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flush_icache_range(kvmppc_booke_handlers,
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kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
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return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
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}
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static void __exit kvmppc_booke_exit(void)
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{
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free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
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kvm_exit();
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}
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module_init(kvmppc_booke_init)
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module_exit(kvmppc_booke_exit)
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