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linux/arch/powerpc/kvm/book3s_64_emulate.c
Alexander Graf e15a113700 powerpc/kvm: Sync guest visible MMU state 
Currently userspace has no chance to find out which virtual address space we're
in and resolve addresses. While that is a big problem for migration, it's also
unpleasent when debugging, as gdb and the monitor don't work on virtual
addresses.

This patch exports enough of the MMU segment state to userspace to make
debugging work and thus also includes the groundwork for migration.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-12-08 16:02:50 +11:00

346 lines
8.2 KiB
C
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/*
* 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/kvm_ppc.h>
#include <asm/disassemble.h>
#include <asm/kvm_book3s.h>
#include <asm/reg.h>
#define OP_19_XOP_RFID 18
#define OP_19_XOP_RFI 50
#define OP_31_XOP_MFMSR 83
#define OP_31_XOP_MTMSR 146
#define OP_31_XOP_MTMSRD 178
#define OP_31_XOP_MTSRIN 242
#define OP_31_XOP_TLBIEL 274
#define OP_31_XOP_TLBIE 306
#define OP_31_XOP_SLBMTE 402
#define OP_31_XOP_SLBIE 434
#define OP_31_XOP_SLBIA 498
#define OP_31_XOP_MFSRIN 659
#define OP_31_XOP_SLBMFEV 851
#define OP_31_XOP_EIOIO 854
#define OP_31_XOP_SLBMFEE 915
/* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
#define OP_31_XOP_DCBZ 1010
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
switch (get_op(inst)) {
case 19:
switch (get_xop(inst)) {
case OP_19_XOP_RFID:
case OP_19_XOP_RFI:
vcpu->arch.pc = vcpu->arch.srr0;
kvmppc_set_msr(vcpu, vcpu->arch.srr1);
*advance = 0;
break;
default:
emulated = EMULATE_FAIL;
break;
}
break;
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_MFMSR:
vcpu->arch.gpr[get_rt(inst)] = vcpu->arch.msr;
break;
case OP_31_XOP_MTMSRD:
{
ulong rs = vcpu->arch.gpr[get_rs(inst)];
if (inst & 0x10000) {
vcpu->arch.msr &= ~(MSR_RI | MSR_EE);
vcpu->arch.msr |= rs & (MSR_RI | MSR_EE);
} else
kvmppc_set_msr(vcpu, rs);
break;
}
case OP_31_XOP_MTMSR:
kvmppc_set_msr(vcpu, vcpu->arch.gpr[get_rs(inst)]);
break;
case OP_31_XOP_MFSRIN:
{
int srnum;
srnum = (vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf;
if (vcpu->arch.mmu.mfsrin) {
u32 sr;
sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
vcpu->arch.gpr[get_rt(inst)] = sr;
}
break;
}
case OP_31_XOP_MTSRIN:
vcpu->arch.mmu.mtsrin(vcpu,
(vcpu->arch.gpr[get_rb(inst)] >> 28) & 0xf,
vcpu->arch.gpr[get_rs(inst)]);
break;
case OP_31_XOP_TLBIE:
case OP_31_XOP_TLBIEL:
{
bool large = (inst & 0x00200000) ? true : false;
ulong addr = vcpu->arch.gpr[get_rb(inst)];
vcpu->arch.mmu.tlbie(vcpu, addr, large);
break;
}
case OP_31_XOP_EIOIO:
break;
case OP_31_XOP_SLBMTE:
if (!vcpu->arch.mmu.slbmte)
return EMULATE_FAIL;
vcpu->arch.mmu.slbmte(vcpu, vcpu->arch.gpr[get_rs(inst)],
vcpu->arch.gpr[get_rb(inst)]);
break;
case OP_31_XOP_SLBIE:
if (!vcpu->arch.mmu.slbie)
return EMULATE_FAIL;
vcpu->arch.mmu.slbie(vcpu, vcpu->arch.gpr[get_rb(inst)]);
break;
case OP_31_XOP_SLBIA:
if (!vcpu->arch.mmu.slbia)
return EMULATE_FAIL;
vcpu->arch.mmu.slbia(vcpu);
break;
case OP_31_XOP_SLBMFEE:
if (!vcpu->arch.mmu.slbmfee) {
emulated = EMULATE_FAIL;
} else {
ulong t, rb;
rb = vcpu->arch.gpr[get_rb(inst)];
t = vcpu->arch.mmu.slbmfee(vcpu, rb);
vcpu->arch.gpr[get_rt(inst)] = t;
}
break;
case OP_31_XOP_SLBMFEV:
if (!vcpu->arch.mmu.slbmfev) {
emulated = EMULATE_FAIL;
} else {
ulong t, rb;
rb = vcpu->arch.gpr[get_rb(inst)];
t = vcpu->arch.mmu.slbmfev(vcpu, rb);
vcpu->arch.gpr[get_rt(inst)] = t;
}
break;
case OP_31_XOP_DCBZ:
{
ulong rb = vcpu->arch.gpr[get_rb(inst)];
ulong ra = 0;
ulong addr;
u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
if (get_ra(inst))
ra = vcpu->arch.gpr[get_ra(inst)];
addr = (ra + rb) & ~31ULL;
if (!(vcpu->arch.msr & MSR_SF))
addr &= 0xffffffff;
if (kvmppc_st(vcpu, addr, 32, zeros)) {
vcpu->arch.dear = addr;
vcpu->arch.fault_dear = addr;
to_book3s(vcpu)->dsisr = DSISR_PROTFAULT |
DSISR_ISSTORE;
kvmppc_book3s_queue_irqprio(vcpu,
BOOK3S_INTERRUPT_DATA_STORAGE);
kvmppc_mmu_pte_flush(vcpu, addr, ~0xFFFULL);
}
break;
}
default:
emulated = EMULATE_FAIL;
}
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, bool upper,
u32 val)
{
if (upper) {
/* Upper BAT */
u32 bl = (val >> 2) & 0x7ff;
bat->bepi_mask = (~bl << 17);
bat->bepi = val & 0xfffe0000;
bat->vs = (val & 2) ? 1 : 0;
bat->vp = (val & 1) ? 1 : 0;
bat->raw = (bat->raw & 0xffffffff00000000ULL) | val;
} else {
/* Lower BAT */
bat->brpn = val & 0xfffe0000;
bat->wimg = (val >> 3) & 0xf;
bat->pp = val & 3;
bat->raw = (bat->raw & 0x00000000ffffffffULL) | ((u64)val << 32);
}
}
static void kvmppc_write_bat(struct kvm_vcpu *vcpu, int sprn, u32 val)
{
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
struct kvmppc_bat *bat;
switch (sprn) {
case SPRN_IBAT0U ... SPRN_IBAT3L:
bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT0U) / 2];
break;
case SPRN_IBAT4U ... SPRN_IBAT7L:
bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT4U) / 2];
break;
case SPRN_DBAT0U ... SPRN_DBAT3L:
bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT0U) / 2];
break;
case SPRN_DBAT4U ... SPRN_DBAT7L:
bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT4U) / 2];
break;
default:
BUG();
}
kvmppc_set_bat(vcpu, bat, !(sprn % 2), val);
}
int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_SDR1:
to_book3s(vcpu)->sdr1 = vcpu->arch.gpr[rs];
break;
case SPRN_DSISR:
to_book3s(vcpu)->dsisr = vcpu->arch.gpr[rs];
break;
case SPRN_DAR:
vcpu->arch.dear = vcpu->arch.gpr[rs];
break;
case SPRN_HIOR:
to_book3s(vcpu)->hior = vcpu->arch.gpr[rs];
break;
case SPRN_IBAT0U ... SPRN_IBAT3L:
case SPRN_IBAT4U ... SPRN_IBAT7L:
case SPRN_DBAT0U ... SPRN_DBAT3L:
case SPRN_DBAT4U ... SPRN_DBAT7L:
kvmppc_write_bat(vcpu, sprn, (u32)vcpu->arch.gpr[rs]);
/* BAT writes happen so rarely that we're ok to flush
* everything here */
kvmppc_mmu_pte_flush(vcpu, 0, 0);
break;
case SPRN_HID0:
to_book3s(vcpu)->hid[0] = vcpu->arch.gpr[rs];
break;
case SPRN_HID1:
to_book3s(vcpu)->hid[1] = vcpu->arch.gpr[rs];
break;
case SPRN_HID2:
to_book3s(vcpu)->hid[2] = vcpu->arch.gpr[rs];
break;
case SPRN_HID4:
to_book3s(vcpu)->hid[4] = vcpu->arch.gpr[rs];
break;
case SPRN_HID5:
to_book3s(vcpu)->hid[5] = vcpu->arch.gpr[rs];
/* guest HID5 set can change is_dcbz32 */
if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
(mfmsr() & MSR_HV))
vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
break;
case SPRN_ICTC:
case SPRN_THRM1:
case SPRN_THRM2:
case SPRN_THRM3:
case SPRN_CTRLF:
case SPRN_CTRLT:
break;
default:
printk(KERN_INFO "KVM: invalid SPR write: %d\n", sprn);
#ifndef DEBUG_SPR
emulated = EMULATE_FAIL;
#endif
break;
}
return emulated;
}
int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_SDR1:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->sdr1;
break;
case SPRN_DSISR:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->dsisr;
break;
case SPRN_DAR:
vcpu->arch.gpr[rt] = vcpu->arch.dear;
break;
case SPRN_HIOR:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hior;
break;
case SPRN_HID0:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[0];
break;
case SPRN_HID1:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[1];
break;
case SPRN_HID2:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[2];
break;
case SPRN_HID4:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[4];
break;
case SPRN_HID5:
vcpu->arch.gpr[rt] = to_book3s(vcpu)->hid[5];
break;
case SPRN_THRM1:
case SPRN_THRM2:
case SPRN_THRM3:
case SPRN_CTRLF:
case SPRN_CTRLT:
vcpu->arch.gpr[rt] = 0;
break;
default:
printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
#ifndef DEBUG_SPR
emulated = EMULATE_FAIL;
#endif
break;
}
return emulated;
}
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