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Diffstat (limited to 'arch/powerpc/kvm/emulate.c')
-rw-r--r--arch/powerpc/kvm/emulate.c345
1 files changed, 65 insertions, 280 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 2c52ada30775..355d5206e8aa 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -1,16 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
- * 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. 2007
* Copyright 2011 Freescale Semiconductor, Inc.
@@ -30,70 +19,21 @@
#include <asm/byteorder.h>
#include <asm/kvm_ppc.h>
#include <asm/disassemble.h>
+#include <asm/ppc-opcode.h>
#include "timing.h"
#include "trace.h"
-#define OP_TRAP 3
-#define OP_TRAP_64 2
-
-#define OP_31_XOP_TRAP 4
-#define OP_31_XOP_LWZX 23
-#define OP_31_XOP_DCBST 54
-#define OP_31_XOP_TRAP_64 68
-#define OP_31_XOP_DCBF 86
-#define OP_31_XOP_LBZX 87
-#define OP_31_XOP_STWX 151
-#define OP_31_XOP_STBX 215
-#define OP_31_XOP_LBZUX 119
-#define OP_31_XOP_STBUX 247
-#define OP_31_XOP_LHZX 279
-#define OP_31_XOP_LHZUX 311
-#define OP_31_XOP_MFSPR 339
-#define OP_31_XOP_LHAX 343
-#define OP_31_XOP_STHX 407
-#define OP_31_XOP_STHUX 439
-#define OP_31_XOP_MTSPR 467
-#define OP_31_XOP_DCBI 470
-#define OP_31_XOP_LWBRX 534
-#define OP_31_XOP_TLBSYNC 566
-#define OP_31_XOP_STWBRX 662
-#define OP_31_XOP_LHBRX 790
-#define OP_31_XOP_STHBRX 918
-
-#define OP_LWZ 32
-#define OP_LD 58
-#define OP_LWZU 33
-#define OP_LBZ 34
-#define OP_LBZU 35
-#define OP_STW 36
-#define OP_STWU 37
-#define OP_STD 62
-#define OP_STB 38
-#define OP_STBU 39
-#define OP_LHZ 40
-#define OP_LHZU 41
-#define OP_LHA 42
-#define OP_LHAU 43
-#define OP_STH 44
-#define OP_STHU 45
-
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec;
unsigned long long dec_time;
- pr_debug("mtDEC: %x\n", vcpu->arch.dec);
+ pr_debug("mtDEC: %lx\n", vcpu->arch.dec);
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
#ifdef CONFIG_PPC_BOOK3S
/* mtdec lowers the interrupt line when positive. */
kvmppc_core_dequeue_dec(vcpu);
-
- /* POWER4+ triggers a dec interrupt if the value is < 0 */
- if (vcpu->arch.dec & 0x80000000) {
- kvmppc_core_queue_dec(vcpu);
- return;
- }
#endif
#ifdef CONFIG_BOOKE
@@ -110,11 +50,10 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
dec_time = vcpu->arch.dec;
/*
- * Guest timebase ticks at the same frequency as host decrementer.
- * So use the host decrementer calculations for decrementer emulation.
+ * Guest timebase ticks at the same frequency as host timebase.
+ * So use the host timebase calculations for decrementer emulation.
*/
- dec_time = dec_time << decrementer_clockevent.shift;
- do_div(dec_time, decrementer_clockevent.mult);
+ dec_time = tb_to_ns(dec_time);
dec_nsec = do_div(dec_time, NSEC_PER_SEC);
hrtimer_start(&vcpu->arch.dec_timer,
ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
@@ -140,10 +79,10 @@ static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
switch (sprn) {
case SPRN_SRR0:
- vcpu->arch.shared->srr0 = spr_val;
+ kvmppc_set_srr0(vcpu, spr_val);
break;
case SPRN_SRR1:
- vcpu->arch.shared->srr1 = spr_val;
+ kvmppc_set_srr1(vcpu, spr_val);
break;
/* XXX We need to context-switch the timebase for
@@ -152,29 +91,29 @@ static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
case SPRN_TBWU: break;
case SPRN_DEC:
- vcpu->arch.dec = spr_val;
+ vcpu->arch.dec = (u32) spr_val;
kvmppc_emulate_dec(vcpu);
break;
case SPRN_SPRG0:
- vcpu->arch.shared->sprg0 = spr_val;
+ kvmppc_set_sprg0(vcpu, spr_val);
break;
case SPRN_SPRG1:
- vcpu->arch.shared->sprg1 = spr_val;
+ kvmppc_set_sprg1(vcpu, spr_val);
break;
case SPRN_SPRG2:
- vcpu->arch.shared->sprg2 = spr_val;
+ kvmppc_set_sprg2(vcpu, spr_val);
break;
case SPRN_SPRG3:
- vcpu->arch.shared->sprg3 = spr_val;
+ kvmppc_set_sprg3(vcpu, spr_val);
break;
/* PIR can legally be written, but we ignore it */
case SPRN_PIR: break;
default:
- emulated = kvmppc_core_emulate_mtspr(vcpu, sprn,
- spr_val);
+ emulated = vcpu->kvm->arch.kvm_ops->emulate_mtspr(vcpu, sprn,
+ spr_val);
if (emulated == EMULATE_FAIL)
printk(KERN_INFO "mtspr: unknown spr "
"0x%x\n", sprn);
@@ -193,10 +132,10 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
switch (sprn) {
case SPRN_SRR0:
- spr_val = vcpu->arch.shared->srr0;
+ spr_val = kvmppc_get_srr0(vcpu);
break;
case SPRN_SRR1:
- spr_val = vcpu->arch.shared->srr1;
+ spr_val = kvmppc_get_srr1(vcpu);
break;
case SPRN_PVR:
spr_val = vcpu->arch.pvr;
@@ -216,16 +155,16 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
break;
case SPRN_SPRG0:
- spr_val = vcpu->arch.shared->sprg0;
+ spr_val = kvmppc_get_sprg0(vcpu);
break;
case SPRN_SPRG1:
- spr_val = vcpu->arch.shared->sprg1;
+ spr_val = kvmppc_get_sprg1(vcpu);
break;
case SPRN_SPRG2:
- spr_val = vcpu->arch.shared->sprg2;
+ spr_val = kvmppc_get_sprg2(vcpu);
break;
case SPRN_SPRG3:
- spr_val = vcpu->arch.shared->sprg3;
+ spr_val = kvmppc_get_sprg3(vcpu);
break;
/* Note: SPRG4-7 are user-readable, so we don't get
* a trap. */
@@ -234,8 +173,8 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
spr_val = kvmppc_get_dec(vcpu, get_tb());
break;
default:
- emulated = kvmppc_core_emulate_mfspr(vcpu, sprn,
- &spr_val);
+ emulated = vcpu->kvm->arch.kvm_ops->emulate_mfspr(vcpu, sprn,
+ &spr_val);
if (unlikely(emulated == EMULATE_FAIL)) {
printk(KERN_INFO "mfspr: unknown spr "
"0x%x\n", sprn);
@@ -250,37 +189,30 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
return emulated;
}
-/* XXX to do:
- * lhax
- * lhaux
- * lswx
- * lswi
- * stswx
- * stswi
- * lha
- * lhau
- * lmw
- * stmw
- *
- * XXX is_bigendian should depend on MMU mapping or MSR[LE]
- */
/* XXX Should probably auto-generate instruction decoding for a particular core
* from opcode tables in the future. */
-int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
+int kvmppc_emulate_instruction(struct kvm_vcpu *vcpu)
{
- u32 inst = kvmppc_get_last_inst(vcpu);
- int ra = get_ra(inst);
- int rs = get_rs(inst);
- int rt = get_rt(inst);
- int sprn = get_sprn(inst);
- enum emulation_result emulated = EMULATE_DONE;
+ u32 inst;
+ ppc_inst_t pinst;
+ int rs, rt, sprn;
+ enum emulation_result emulated;
int advance = 1;
/* this default type might be overwritten by subcategories */
kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
+ emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst);
+ inst = ppc_inst_val(pinst);
+ if (emulated != EMULATE_DONE)
+ return emulated;
+
pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
+ rs = get_rs(inst);
+ rt = get_rt(inst);
+ sprn = get_sprn(inst);
+
switch (get_op(inst)) {
case OP_TRAP:
#ifdef CONFIG_PPC_BOOK3S
@@ -308,198 +240,46 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
#endif
advance = 0;
break;
- case OP_31_XOP_LWZX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
- break;
-
- case OP_31_XOP_LBZX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
- break;
-
- case OP_31_XOP_LBZUX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_31_XOP_STWX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 1);
- break;
-
- case OP_31_XOP_STBX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
- break;
-
- case OP_31_XOP_STBUX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_31_XOP_LHAX:
- emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
- break;
-
- case OP_31_XOP_LHZX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
- break;
-
- case OP_31_XOP_LHZUX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
case OP_31_XOP_MFSPR:
emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt);
- break;
-
- case OP_31_XOP_STHX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
- break;
-
- case OP_31_XOP_STHUX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ if (emulated == EMULATE_AGAIN) {
+ emulated = EMULATE_DONE;
+ advance = 0;
+ }
break;
case OP_31_XOP_MTSPR:
emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs);
- break;
-
- case OP_31_XOP_DCBST:
- case OP_31_XOP_DCBF:
- case OP_31_XOP_DCBI:
- /* Do nothing. The guest is performing dcbi because
- * hardware DMA is not snooped by the dcache, but
- * emulated DMA either goes through the dcache as
- * normal writes, or the host kernel has handled dcache
- * coherence. */
- break;
-
- case OP_31_XOP_LWBRX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
+ if (emulated == EMULATE_AGAIN) {
+ emulated = EMULATE_DONE;
+ advance = 0;
+ }
break;
case OP_31_XOP_TLBSYNC:
break;
- case OP_31_XOP_STWBRX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 0);
- break;
-
- case OP_31_XOP_LHBRX:
- emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
- break;
-
- case OP_31_XOP_STHBRX:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 0);
- break;
-
default:
/* Attempt core-specific emulation below. */
emulated = EMULATE_FAIL;
}
break;
- case OP_LWZ:
- emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
- break;
-
- /* TBD: Add support for other 64 bit load variants like ldu, ldux, ldx etc. */
- case OP_LD:
- rt = get_rt(inst);
- emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
- break;
-
- case OP_LWZU:
- emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_LBZ:
- emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
- break;
-
- case OP_LBZU:
- emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_STW:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 1);
- break;
-
- /* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */
- case OP_STD:
- rs = get_rs(inst);
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 8, 1);
- break;
-
- case OP_STWU:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_STB:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
- break;
-
- case OP_STBU:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_LHZ:
- emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
- break;
-
- case OP_LHZU:
- emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_LHA:
- emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
- break;
-
- case OP_LHAU:
- emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
- break;
-
- case OP_STH:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
- break;
+ case 0:
+ /*
+ * Instruction with primary opcode 0. Based on PowerISA
+ * these are illegal instructions.
+ */
+ if (inst == KVMPPC_INST_SW_BREAKPOINT) {
+ vcpu->run->exit_reason = KVM_EXIT_DEBUG;
+ vcpu->run->debug.arch.status = 0;
+ vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu);
+ emulated = EMULATE_EXIT_USER;
+ advance = 0;
+ } else
+ emulated = EMULATE_FAIL;
- case OP_STHU:
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
- kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
default:
@@ -507,22 +287,27 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
}
if (emulated == EMULATE_FAIL) {
- emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
+ emulated = vcpu->kvm->arch.kvm_ops->emulate_op(vcpu, inst,
+ &advance);
if (emulated == EMULATE_AGAIN) {
advance = 0;
} else if (emulated == EMULATE_FAIL) {
advance = 0;
printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
"(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
- kvmppc_core_queue_program(vcpu, 0);
}
}
trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
/* Advance past emulated instruction. */
+ /*
+ * If this ever handles prefixed instructions, the 4
+ * will need to become ppc_inst_len(pinst) instead.
+ */
if (advance)
kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
return emulated;
}
+EXPORT_SYMBOL_GPL(kvmppc_emulate_instruction);
generated by cgit (git 2.34.1) at 2025-12-25 03:39:20 +0000