c01e3f66cd
Today we handle split real mode by mapping both instruction and data faults into a special virtual address space that only exists during the split mode phase. This is good enough to catch 32bit Linux guests that use split real mode for copy_from/to_user. In this case we're always prefixed with 0xc0000000 for our instruction pointer and can map the user space process freely below there. However, that approach fails when we're running KVM inside of KVM. Here the 1st level last_inst reader may well be in the same virtual page as a 2nd level interrupt handler. It also fails when running Mac OS X guests. Here we have a 4G/4G split, so a kernel copy_from/to_user implementation can easily overlap with user space addresses. The architecturally correct way to fix this would be to implement an instruction interpreter in KVM that kicks in whenever we go into split real mode. This interpreter however would not receive a great amount of testing and be a lot of bloat for a reasonably isolated corner case. So I went back to the drawing board and tried to come up with a way to make split real mode work with a single flat address space. And then I realized that we could get away with the same trick that makes it work for Linux: Whenever we see an instruction address during split real mode that may collide, we just move it higher up the virtual address space to a place that hopefully does not collide (keep your fingers crossed!). That approach does work surprisingly well. I am able to successfully run Mac OS X guests with KVM and QEMU (no split real mode hacks like MOL) when I apply a tiny timing probe hack to QEMU. I'd say this is a win over even more broken split real mode :). Signed-off-by: Alexander Graf <agraf@suse.de>
153 lines
5.3 KiB
C
153 lines
5.3 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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#ifndef __POWERPC_KVM_ASM_H__
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#define __POWERPC_KVM_ASM_H__
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#ifdef __ASSEMBLY__
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#ifdef CONFIG_64BIT
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#define PPC_STD(sreg, offset, areg) std sreg, (offset)(areg)
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#define PPC_LD(treg, offset, areg) ld treg, (offset)(areg)
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#else
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#define PPC_STD(sreg, offset, areg) stw sreg, (offset+4)(areg)
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#define PPC_LD(treg, offset, areg) lwz treg, (offset+4)(areg)
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#endif
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#endif
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/* IVPR must be 64KiB-aligned. */
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#define VCPU_SIZE_ORDER 4
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#define VCPU_SIZE_LOG (VCPU_SIZE_ORDER + 12)
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#define VCPU_TLB_PGSZ PPC44x_TLB_64K
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#define VCPU_SIZE_BYTES (1<<VCPU_SIZE_LOG)
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#define BOOKE_INTERRUPT_CRITICAL 0
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#define BOOKE_INTERRUPT_MACHINE_CHECK 1
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#define BOOKE_INTERRUPT_DATA_STORAGE 2
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#define BOOKE_INTERRUPT_INST_STORAGE 3
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#define BOOKE_INTERRUPT_EXTERNAL 4
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#define BOOKE_INTERRUPT_ALIGNMENT 5
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#define BOOKE_INTERRUPT_PROGRAM 6
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#define BOOKE_INTERRUPT_FP_UNAVAIL 7
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#define BOOKE_INTERRUPT_SYSCALL 8
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#define BOOKE_INTERRUPT_AP_UNAVAIL 9
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#define BOOKE_INTERRUPT_DECREMENTER 10
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#define BOOKE_INTERRUPT_FIT 11
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#define BOOKE_INTERRUPT_WATCHDOG 12
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#define BOOKE_INTERRUPT_DTLB_MISS 13
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#define BOOKE_INTERRUPT_ITLB_MISS 14
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#define BOOKE_INTERRUPT_DEBUG 15
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/* E500 */
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#define BOOKE_INTERRUPT_SPE_ALTIVEC_UNAVAIL 32
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#define BOOKE_INTERRUPT_SPE_FP_DATA_ALTIVEC_ASSIST 33
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/*
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* TODO: Unify 32-bit and 64-bit kernel exception handlers to use same defines
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*/
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#define BOOKE_INTERRUPT_SPE_UNAVAIL BOOKE_INTERRUPT_SPE_ALTIVEC_UNAVAIL
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#define BOOKE_INTERRUPT_SPE_FP_DATA BOOKE_INTERRUPT_SPE_FP_DATA_ALTIVEC_ASSIST
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#define BOOKE_INTERRUPT_ALTIVEC_UNAVAIL BOOKE_INTERRUPT_SPE_ALTIVEC_UNAVAIL
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#define BOOKE_INTERRUPT_ALTIVEC_ASSIST \
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BOOKE_INTERRUPT_SPE_FP_DATA_ALTIVEC_ASSIST
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#define BOOKE_INTERRUPT_SPE_FP_ROUND 34
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#define BOOKE_INTERRUPT_PERFORMANCE_MONITOR 35
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#define BOOKE_INTERRUPT_DOORBELL 36
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#define BOOKE_INTERRUPT_DOORBELL_CRITICAL 37
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/* booke_hv */
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#define BOOKE_INTERRUPT_GUEST_DBELL 38
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#define BOOKE_INTERRUPT_GUEST_DBELL_CRIT 39
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#define BOOKE_INTERRUPT_HV_SYSCALL 40
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#define BOOKE_INTERRUPT_HV_PRIV 41
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#define BOOKE_INTERRUPT_LRAT_ERROR 42
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/* book3s */
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#define BOOK3S_INTERRUPT_SYSTEM_RESET 0x100
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#define BOOK3S_INTERRUPT_MACHINE_CHECK 0x200
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#define BOOK3S_INTERRUPT_DATA_STORAGE 0x300
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#define BOOK3S_INTERRUPT_DATA_SEGMENT 0x380
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#define BOOK3S_INTERRUPT_INST_STORAGE 0x400
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#define BOOK3S_INTERRUPT_INST_SEGMENT 0x480
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#define BOOK3S_INTERRUPT_EXTERNAL 0x500
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#define BOOK3S_INTERRUPT_EXTERNAL_LEVEL 0x501
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#define BOOK3S_INTERRUPT_EXTERNAL_HV 0x502
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#define BOOK3S_INTERRUPT_ALIGNMENT 0x600
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#define BOOK3S_INTERRUPT_PROGRAM 0x700
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#define BOOK3S_INTERRUPT_FP_UNAVAIL 0x800
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#define BOOK3S_INTERRUPT_DECREMENTER 0x900
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#define BOOK3S_INTERRUPT_HV_DECREMENTER 0x980
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#define BOOK3S_INTERRUPT_DOORBELL 0xa00
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#define BOOK3S_INTERRUPT_SYSCALL 0xc00
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#define BOOK3S_INTERRUPT_TRACE 0xd00
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#define BOOK3S_INTERRUPT_H_DATA_STORAGE 0xe00
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#define BOOK3S_INTERRUPT_H_INST_STORAGE 0xe20
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#define BOOK3S_INTERRUPT_H_EMUL_ASSIST 0xe40
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#define BOOK3S_INTERRUPT_H_DOORBELL 0xe80
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#define BOOK3S_INTERRUPT_PERFMON 0xf00
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#define BOOK3S_INTERRUPT_ALTIVEC 0xf20
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#define BOOK3S_INTERRUPT_VSX 0xf40
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#define BOOK3S_INTERRUPT_FAC_UNAVAIL 0xf60
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#define BOOK3S_INTERRUPT_H_FAC_UNAVAIL 0xf80
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#define BOOK3S_IRQPRIO_SYSTEM_RESET 0
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#define BOOK3S_IRQPRIO_DATA_SEGMENT 1
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#define BOOK3S_IRQPRIO_INST_SEGMENT 2
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#define BOOK3S_IRQPRIO_DATA_STORAGE 3
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#define BOOK3S_IRQPRIO_INST_STORAGE 4
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#define BOOK3S_IRQPRIO_ALIGNMENT 5
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#define BOOK3S_IRQPRIO_PROGRAM 6
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#define BOOK3S_IRQPRIO_FP_UNAVAIL 7
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#define BOOK3S_IRQPRIO_ALTIVEC 8
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#define BOOK3S_IRQPRIO_VSX 9
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#define BOOK3S_IRQPRIO_FAC_UNAVAIL 10
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#define BOOK3S_IRQPRIO_SYSCALL 11
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#define BOOK3S_IRQPRIO_MACHINE_CHECK 12
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#define BOOK3S_IRQPRIO_DEBUG 13
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#define BOOK3S_IRQPRIO_EXTERNAL 14
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#define BOOK3S_IRQPRIO_DECREMENTER 15
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#define BOOK3S_IRQPRIO_PERFORMANCE_MONITOR 16
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#define BOOK3S_IRQPRIO_EXTERNAL_LEVEL 17
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#define BOOK3S_IRQPRIO_MAX 18
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#define BOOK3S_HFLAG_DCBZ32 0x1
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#define BOOK3S_HFLAG_SLB 0x2
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#define BOOK3S_HFLAG_PAIRED_SINGLE 0x4
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#define BOOK3S_HFLAG_NATIVE_PS 0x8
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#define BOOK3S_HFLAG_MULTI_PGSIZE 0x10
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#define BOOK3S_HFLAG_NEW_TLBIE 0x20
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#define BOOK3S_HFLAG_SPLIT_HACK 0x40
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#define RESUME_FLAG_NV (1<<0) /* Reload guest nonvolatile state? */
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#define RESUME_FLAG_HOST (1<<1) /* Resume host? */
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#define RESUME_FLAG_ARCH1 (1<<2)
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#define RESUME_GUEST 0
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#define RESUME_GUEST_NV RESUME_FLAG_NV
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#define RESUME_HOST RESUME_FLAG_HOST
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#define RESUME_HOST_NV (RESUME_FLAG_HOST|RESUME_FLAG_NV)
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#define KVM_GUEST_MODE_NONE 0
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#define KVM_GUEST_MODE_GUEST 1
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#define KVM_GUEST_MODE_SKIP 2
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#define KVM_GUEST_MODE_GUEST_HV 3
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#define KVM_GUEST_MODE_HOST_HV 4
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#define KVM_INST_FETCH_FAILED -1
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#endif /* __POWERPC_KVM_ASM_H__ */
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