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linux-2.6/arch/powerpc/kvm/book3s_emulate.c
Alexander Graf 54771e6217 KVM: PPC: Emulator: clean up SPR reads and writes 
When reading and writing SPRs, every SPR emulation piece had to read
or write the respective GPR the value was read from or stored in itself.

This approach is pretty prone to failure. What if we accidentally
implement mfspr emulation where we just do "break" and nothing else?
Suddenly we would get a random value in the return register - which is
always a bad idea.

So let's consolidate the generic code paths and only give the core
specific SPR handling code readily made variables to read/write from/to.

Functionally, this patch doesn't change anything, but it increases the
readability of the code and makes is less prone to bugs.

Signed-off-by: Alexander Graf <agraf@suse.de>
2012-05-06 16:19:13 +02:00

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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>
#include <asm/switch_to.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_MTSR 210
#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_MFSR 595
#define OP_31_XOP_MFSRIN 659
#define OP_31_XOP_DCBA 758
#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
#define OP_LFS 48
#define OP_LFD 50
#define OP_STFS 52
#define OP_STFD 54
#define SPRN_GQR0 912
#define SPRN_GQR1 913
#define SPRN_GQR2 914
#define SPRN_GQR3 915
#define SPRN_GQR4 916
#define SPRN_GQR5 917
#define SPRN_GQR6 918
#define SPRN_GQR7 919
/* Book3S_32 defines mfsrin(v) - but that messes up our abstract
* function pointers, so let's just disable the define. */
#undef mfsrin
enum priv_level {
PRIV_PROBLEM = 0,
PRIV_SUPER = 1,
PRIV_HYPER = 2,
};
static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
{
/* PAPR VMs only access supervisor SPRs */
if (vcpu->arch.papr_enabled && (level > PRIV_SUPER))
return false;
/* Limit user space to its own small SPR set */
if ((vcpu->arch.shared->msr & MSR_PR) && level > PRIV_PROBLEM)
return false;
return true;
}
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
int rt = get_rt(inst);
int rs = get_rs(inst);
int ra = get_ra(inst);
int rb = get_rb(inst);
switch (get_op(inst)) {
case 19:
switch (get_xop(inst)) {
case OP_19_XOP_RFID:
case OP_19_XOP_RFI:
kvmppc_set_pc(vcpu, vcpu->arch.shared->srr0);
kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
*advance = 0;
break;
default:
emulated = EMULATE_FAIL;
break;
}
break;
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_MFMSR:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
break;
case OP_31_XOP_MTMSRD:
{
ulong rs_val = kvmppc_get_gpr(vcpu, rs);
if (inst & 0x10000) {
ulong new_msr = vcpu->arch.shared->msr;
new_msr &= ~(MSR_RI | MSR_EE);
new_msr |= rs_val & (MSR_RI | MSR_EE);
vcpu->arch.shared->msr = new_msr;
} else
kvmppc_set_msr(vcpu, rs_val);
break;
}
case OP_31_XOP_MTMSR:
kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_MFSR:
{
int srnum;
srnum = kvmppc_get_field(inst, 12 + 32, 15 + 32);
if (vcpu->arch.mmu.mfsrin) {
u32 sr;
sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
kvmppc_set_gpr(vcpu, rt, sr);
}
break;
}
case OP_31_XOP_MFSRIN:
{
int srnum;
srnum = (kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf;
if (vcpu->arch.mmu.mfsrin) {
u32 sr;
sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
kvmppc_set_gpr(vcpu, rt, sr);
}
break;
}
case OP_31_XOP_MTSR:
vcpu->arch.mmu.mtsrin(vcpu,
(inst >> 16) & 0xf,
kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_MTSRIN:
vcpu->arch.mmu.mtsrin(vcpu,
(kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf,
kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_TLBIE:
case OP_31_XOP_TLBIEL:
{
bool large = (inst & 0x00200000) ? true : false;
ulong addr = kvmppc_get_gpr(vcpu, rb);
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,
kvmppc_get_gpr(vcpu, rs),
kvmppc_get_gpr(vcpu, rb));
break;
case OP_31_XOP_SLBIE:
if (!vcpu->arch.mmu.slbie)
return EMULATE_FAIL;
vcpu->arch.mmu.slbie(vcpu,
kvmppc_get_gpr(vcpu, rb));
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_val;
rb_val = kvmppc_get_gpr(vcpu, rb);
t = vcpu->arch.mmu.slbmfee(vcpu, rb_val);
kvmppc_set_gpr(vcpu, rt, t);
}
break;
case OP_31_XOP_SLBMFEV:
if (!vcpu->arch.mmu.slbmfev) {
emulated = EMULATE_FAIL;
} else {
ulong t, rb_val;
rb_val = kvmppc_get_gpr(vcpu, rb);
t = vcpu->arch.mmu.slbmfev(vcpu, rb_val);
kvmppc_set_gpr(vcpu, rt, t);
}
break;
case OP_31_XOP_DCBA:
/* Gets treated as NOP */
break;
case OP_31_XOP_DCBZ:
{
ulong rb_val = kvmppc_get_gpr(vcpu, rb);
ulong ra_val = 0;
ulong addr, vaddr;
u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
u32 dsisr;
int r;
if (ra)
ra_val = kvmppc_get_gpr(vcpu, ra);
addr = (ra_val + rb_val) & ~31ULL;
if (!(vcpu->arch.shared->msr & MSR_SF))
addr &= 0xffffffff;
vaddr = addr;
r = kvmppc_st(vcpu, &addr, 32, zeros, true);
if ((r == -ENOENT) || (r == -EPERM)) {
struct kvmppc_book3s_shadow_vcpu *svcpu;
svcpu = svcpu_get(vcpu);
*advance = 0;
vcpu->arch.shared->dar = vaddr;
svcpu->fault_dar = vaddr;
dsisr = DSISR_ISSTORE;
if (r == -ENOENT)
dsisr |= DSISR_NOHPTE;
else if (r == -EPERM)
dsisr |= DSISR_PROTFAULT;
vcpu->arch.shared->dsisr = dsisr;
svcpu->fault_dsisr = dsisr;
svcpu_put(svcpu);
kvmppc_book3s_queue_irqprio(vcpu,
BOOK3S_INTERRUPT_DATA_STORAGE);
}
break;
}
default:
emulated = EMULATE_FAIL;
}
break;
default:
emulated = EMULATE_FAIL;
}
if (emulated == EMULATE_FAIL)
emulated = kvmppc_emulate_paired_single(run, vcpu);
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 struct kvmppc_bat *kvmppc_find_bat(struct kvm_vcpu *vcpu, int sprn)
{
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[4 + ((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[4 + ((sprn - SPRN_DBAT4U) / 2)];
break;
default:
BUG();
}
return bat;
}
int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_SDR1:
if (!spr_allowed(vcpu, PRIV_HYPER))
goto unprivileged;
to_book3s(vcpu)->sdr1 = spr_val;
break;
case SPRN_DSISR:
vcpu->arch.shared->dsisr = spr_val;
break;
case SPRN_DAR:
vcpu->arch.shared->dar = spr_val;
break;
case SPRN_HIOR:
to_book3s(vcpu)->hior = spr_val;
break;
case SPRN_IBAT0U ... SPRN_IBAT3L:
case SPRN_IBAT4U ... SPRN_IBAT7L:
case SPRN_DBAT0U ... SPRN_DBAT3L:
case SPRN_DBAT4U ... SPRN_DBAT7L:
{
struct kvmppc_bat *bat = kvmppc_find_bat(vcpu, sprn);
kvmppc_set_bat(vcpu, bat, !(sprn % 2), (u32)spr_val);
/* BAT writes happen so rarely that we're ok to flush
* everything here */
kvmppc_mmu_pte_flush(vcpu, 0, 0);
kvmppc_mmu_flush_segments(vcpu);
break;
}
case SPRN_HID0:
to_book3s(vcpu)->hid[0] = spr_val;
break;
case SPRN_HID1:
to_book3s(vcpu)->hid[1] = spr_val;
break;
case SPRN_HID2:
to_book3s(vcpu)->hid[2] = spr_val;
break;
case SPRN_HID2_GEKKO:
to_book3s(vcpu)->hid[2] = spr_val;
/* HID2.PSE controls paired single on gekko */
switch (vcpu->arch.pvr) {
case 0x00080200: /* lonestar 2.0 */
case 0x00088202: /* lonestar 2.2 */
case 0x70000100: /* gekko 1.0 */
case 0x00080100: /* gekko 2.0 */
case 0x00083203: /* gekko 2.3a */
case 0x00083213: /* gekko 2.3b */
case 0x00083204: /* gekko 2.4 */
case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */
case 0x00087200: /* broadway */
if (vcpu->arch.hflags & BOOK3S_HFLAG_NATIVE_PS) {
/* Native paired singles */
} else if (spr_val & (1 << 29)) { /* HID2.PSE */
vcpu->arch.hflags |= BOOK3S_HFLAG_PAIRED_SINGLE;
kvmppc_giveup_ext(vcpu, MSR_FP);
} else {
vcpu->arch.hflags &= ~BOOK3S_HFLAG_PAIRED_SINGLE;
}
break;
}
break;
case SPRN_HID4:
case SPRN_HID4_GEKKO:
to_book3s(vcpu)->hid[4] = spr_val;
break;
case SPRN_HID5:
to_book3s(vcpu)->hid[5] = spr_val;
/* 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_GQR0:
case SPRN_GQR1:
case SPRN_GQR2:
case SPRN_GQR3:
case SPRN_GQR4:
case SPRN_GQR5:
case SPRN_GQR6:
case SPRN_GQR7:
to_book3s(vcpu)->gqr[sprn - SPRN_GQR0] = spr_val;
break;
case SPRN_ICTC:
case SPRN_THRM1:
case SPRN_THRM2:
case SPRN_THRM3:
case SPRN_CTRLF:
case SPRN_CTRLT:
case SPRN_L2CR:
case SPRN_MMCR0_GEKKO:
case SPRN_MMCR1_GEKKO:
case SPRN_PMC1_GEKKO:
case SPRN_PMC2_GEKKO:
case SPRN_PMC3_GEKKO:
case SPRN_PMC4_GEKKO:
case SPRN_WPAR_GEKKO:
break;
unprivileged:
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, ulong *spr_val)
{
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_IBAT0U ... SPRN_IBAT3L:
case SPRN_IBAT4U ... SPRN_IBAT7L:
case SPRN_DBAT0U ... SPRN_DBAT3L:
case SPRN_DBAT4U ... SPRN_DBAT7L:
{
struct kvmppc_bat *bat = kvmppc_find_bat(vcpu, sprn);
if (sprn % 2)
*spr_val = bat->raw >> 32;
else
*spr_val = bat->raw;
break;
}
case SPRN_SDR1:
if (!spr_allowed(vcpu, PRIV_HYPER))
goto unprivileged;
*spr_val = to_book3s(vcpu)->sdr1;
break;
case SPRN_DSISR:
*spr_val = vcpu->arch.shared->dsisr;
break;
case SPRN_DAR:
*spr_val = vcpu->arch.shared->dar;
break;
case SPRN_HIOR:
*spr_val = to_book3s(vcpu)->hior;
break;
case SPRN_HID0:
*spr_val = to_book3s(vcpu)->hid[0];
break;
case SPRN_HID1:
*spr_val = to_book3s(vcpu)->hid[1];
break;
case SPRN_HID2:
case SPRN_HID2_GEKKO:
*spr_val = to_book3s(vcpu)->hid[2];
break;
case SPRN_HID4:
case SPRN_HID4_GEKKO:
*spr_val = to_book3s(vcpu)->hid[4];
break;
case SPRN_HID5:
*spr_val = to_book3s(vcpu)->hid[5];
break;
case SPRN_CFAR:
case SPRN_PURR:
*spr_val = 0;
break;
case SPRN_GQR0:
case SPRN_GQR1:
case SPRN_GQR2:
case SPRN_GQR3:
case SPRN_GQR4:
case SPRN_GQR5:
case SPRN_GQR6:
case SPRN_GQR7:
*spr_val = to_book3s(vcpu)->gqr[sprn - SPRN_GQR0];
break;
case SPRN_THRM1:
case SPRN_THRM2:
case SPRN_THRM3:
case SPRN_CTRLF:
case SPRN_CTRLT:
case SPRN_L2CR:
case SPRN_MMCR0_GEKKO:
case SPRN_MMCR1_GEKKO:
case SPRN_PMC1_GEKKO:
case SPRN_PMC2_GEKKO:
case SPRN_PMC3_GEKKO:
case SPRN_PMC4_GEKKO:
case SPRN_WPAR_GEKKO:
*spr_val = 0;
break;
default:
unprivileged:
printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
#ifndef DEBUG_SPR
emulated = EMULATE_FAIL;
#endif
break;
}
return emulated;
}
u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst)
{
u32 dsisr = 0;
/*
* This is what the spec says about DSISR bits (not mentioned = 0):
*
* 12:13 [DS] Set to bits 30:31
* 15:16 [X] Set to bits 29:30
* 17 [X] Set to bit 25
* [D/DS] Set to bit 5
* 18:21 [X] Set to bits 21:24
* [D/DS] Set to bits 1:4
* 22:26 Set to bits 6:10 (RT/RS/FRT/FRS)
* 27:31 Set to bits 11:15 (RA)
*/
switch (get_op(inst)) {
/* D-form */
case OP_LFS:
case OP_LFD:
case OP_STFD:
case OP_STFS:
dsisr |= (inst >> 12) & 0x4000; /* bit 17 */
dsisr |= (inst >> 17) & 0x3c00; /* bits 18:21 */
break;
/* X-form */
case 31:
dsisr |= (inst << 14) & 0x18000; /* bits 15:16 */
dsisr |= (inst << 8) & 0x04000; /* bit 17 */
dsisr |= (inst << 3) & 0x03c00; /* bits 18:21 */
break;
default:
printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
break;
}
dsisr |= (inst >> 16) & 0x03ff; /* bits 22:31 */
return dsisr;
}
ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst)
{
ulong dar = 0;
ulong ra = get_ra(inst);
ulong rb = get_rb(inst);
switch (get_op(inst)) {
case OP_LFS:
case OP_LFD:
case OP_STFD:
case OP_STFS:
if (ra)
dar = kvmppc_get_gpr(vcpu, ra);
dar += (s32)((s16)inst);
break;
case 31:
if (ra)
dar = kvmppc_get_gpr(vcpu, ra);
dar += kvmppc_get_gpr(vcpu, rb);
break;
default:
printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
break;
}
return dar;
}
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