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kernel-fxtec-pro1x/arch/powerpc/kvm/44x_emulate.c
Hollis Blanchard 73e75b416f KVM: ppc: Implement in-kernel exit timing statistics 
Existing KVM statistics are either just counters (kvm_stat) reported for
KVM generally or trace based aproaches like kvm_trace.
For KVM on powerpc we had the need to track the timings of the different exit
types. While this could be achieved parsing data created with a kvm_trace
extension this adds too much overhead (at least on embedded PowerPC) slowing
down the workloads we wanted to measure.

Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm
code. These statistic is available per vm&vcpu under the kvm debugfs directory.
As this statistic is low, but still some overhead it can be enabled via a
.config entry and should be off by default.

Since this patch touched all powerpc kvm_stat code anyway this code is now
merged and simplified together with the exit timing statistic code (still
working with exit timing disabled in .config).

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31 16:55:41 +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 IBM Corp. 2008
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <asm/kvm_ppc.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/disassemble.h>
#include <asm/kvm_44x.h>
#include "timing.h"
#include "booke.h"
#include "44x_tlb.h"
#define OP_RFI 19
#define XOP_RFI 50
#define XOP_MFMSR 83
#define XOP_WRTEE 131
#define XOP_MTMSR 146
#define XOP_WRTEEI 163
#define XOP_MFDCR 323
#define XOP_MTDCR 451
#define XOP_TLBSX 914
#define XOP_ICCCI 966
#define XOP_TLBWE 978
static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
vcpu->arch.pc = vcpu->arch.srr0;
kvmppc_set_msr(vcpu, vcpu->arch.srr1);
}
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
int dcrn;
int ra;
int rb;
int rc;
int rs;
int rt;
int ws;
switch (get_op(inst)) {
case OP_RFI:
switch (get_xop(inst)) {
case XOP_RFI:
kvmppc_emul_rfi(vcpu);
kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
*advance = 0;
break;
default:
emulated = EMULATE_FAIL;
break;
}
break;
case 31:
switch (get_xop(inst)) {
case XOP_MFMSR:
rt = get_rt(inst);
vcpu->arch.gpr[rt] = vcpu->arch.msr;
kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
break;
case XOP_MTMSR:
rs = get_rs(inst);
kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
break;
case XOP_WRTEE:
rs = get_rs(inst);
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (vcpu->arch.gpr[rs] & MSR_EE);
kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
case XOP_WRTEEI:
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (inst & MSR_EE);
kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
case XOP_MFDCR:
dcrn = get_dcrn(inst);
rt = get_rt(inst);
/* The guest may access CPR0 registers to determine the timebase
* frequency, and it must know the real host frequency because it
* can directly access the timebase registers.
*
* It would be possible to emulate those accesses in userspace,
* but userspace can really only figure out the end frequency.
* We could decompose that into the factors that compute it, but
* that's tricky math, and it's easier to just report the real
* CPR0 values.
*/
switch (dcrn) {
case DCRN_CPR0_CONFIG_ADDR:
vcpu->arch.gpr[rt] = vcpu->arch.cpr0_cfgaddr;
break;
case DCRN_CPR0_CONFIG_DATA:
local_irq_disable();
mtdcr(DCRN_CPR0_CONFIG_ADDR,
vcpu->arch.cpr0_cfgaddr);
vcpu->arch.gpr[rt] = mfdcr(DCRN_CPR0_CONFIG_DATA);
local_irq_enable();
break;
default:
run->dcr.dcrn = dcrn;
run->dcr.data = 0;
run->dcr.is_write = 0;
vcpu->arch.io_gpr = rt;
vcpu->arch.dcr_needed = 1;
account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR;
}
break;
case XOP_MTDCR:
dcrn = get_dcrn(inst);
rs = get_rs(inst);
/* emulate some access in kernel */
switch (dcrn) {
case DCRN_CPR0_CONFIG_ADDR:
vcpu->arch.cpr0_cfgaddr = vcpu->arch.gpr[rs];
break;
default:
run->dcr.dcrn = dcrn;
run->dcr.data = vcpu->arch.gpr[rs];
run->dcr.is_write = 1;
vcpu->arch.dcr_needed = 1;
account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR;
}
break;
case XOP_TLBWE:
ra = get_ra(inst);
rs = get_rs(inst);
ws = get_ws(inst);
emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
break;
case XOP_TLBSX:
rt = get_rt(inst);
ra = get_ra(inst);
rb = get_rb(inst);
rc = get_rc(inst);
emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
break;
case XOP_ICCCI:
break;
default:
emulated = EMULATE_FAIL;
}
break;
default:
emulated = EMULATE_FAIL;
}
return emulated;
}
int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
{
switch (sprn) {
case SPRN_MMUCR:
vcpu->arch.mmucr = vcpu->arch.gpr[rs]; break;
case SPRN_PID:
kvmppc_set_pid(vcpu, vcpu->arch.gpr[rs]); break;
case SPRN_CCR0:
vcpu->arch.ccr0 = vcpu->arch.gpr[rs]; break;
case SPRN_CCR1:
vcpu->arch.ccr1 = vcpu->arch.gpr[rs]; break;
case SPRN_DEAR:
vcpu->arch.dear = vcpu->arch.gpr[rs]; break;
case SPRN_ESR:
vcpu->arch.esr = vcpu->arch.gpr[rs]; break;
case SPRN_DBCR0:
vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break;
case SPRN_DBCR1:
vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break;
case SPRN_TSR:
vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break;
case SPRN_TCR:
vcpu->arch.tcr = vcpu->arch.gpr[rs];
kvmppc_emulate_dec(vcpu);
break;
/* Note: SPRG4-7 are user-readable. These values are
* loaded into the real SPRGs when resuming the
* guest. */
case SPRN_SPRG4:
vcpu->arch.sprg4 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG5:
vcpu->arch.sprg5 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG6:
vcpu->arch.sprg6 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG7:
vcpu->arch.sprg7 = vcpu->arch.gpr[rs]; break;
case SPRN_IVPR:
vcpu->arch.ivpr = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR0:
vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR1:
vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR2:
vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR3:
vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR4:
vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR5:
vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR6:
vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR7:
vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR8:
vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR9:
vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR10:
vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR11:
vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR12:
vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR13:
vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR14:
vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = vcpu->arch.gpr[rs];
break;
case SPRN_IVOR15:
vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = vcpu->arch.gpr[rs];
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
return EMULATE_DONE;
}
int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
switch (sprn) {
/* 440 */
case SPRN_MMUCR:
vcpu->arch.gpr[rt] = vcpu->arch.mmucr; break;
case SPRN_CCR0:
vcpu->arch.gpr[rt] = vcpu->arch.ccr0; break;
case SPRN_CCR1:
vcpu->arch.gpr[rt] = vcpu->arch.ccr1; break;
/* Book E */
case SPRN_PID:
vcpu->arch.gpr[rt] = vcpu->arch.pid; break;
case SPRN_IVPR:
vcpu->arch.gpr[rt] = vcpu->arch.ivpr; break;
case SPRN_DEAR:
vcpu->arch.gpr[rt] = vcpu->arch.dear; break;
case SPRN_ESR:
vcpu->arch.gpr[rt] = vcpu->arch.esr; break;
case SPRN_DBCR0:
vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break;
case SPRN_DBCR1:
vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break;
case SPRN_IVOR0:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
break;
case SPRN_IVOR1:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
break;
case SPRN_IVOR2:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
break;
case SPRN_IVOR3:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
break;
case SPRN_IVOR4:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
break;
case SPRN_IVOR5:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
break;
case SPRN_IVOR6:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
break;
case SPRN_IVOR7:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
break;
case SPRN_IVOR8:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
break;
case SPRN_IVOR9:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
break;
case SPRN_IVOR10:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
break;
case SPRN_IVOR11:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
break;
case SPRN_IVOR12:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
break;
case SPRN_IVOR13:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
break;
case SPRN_IVOR14:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
break;
case SPRN_IVOR15:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
return EMULATE_DONE;
}
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