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KVM: PPC: 440: Implement mfdcrx

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We need mfdcrx to execute properly on 460 cores.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-08-16 00:34:58 +02:00
parent e4dcfe88fb
commit ceb985f9d1
1 changed files with 43 additions and 31 deletions
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74
arch/powerpc/kvm/44x_emulate.c
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@ -27,6 +27,7 @@
#include "booke.h"
#include "44x_tlb.h"
#define XOP_MFDCRX 259
#define XOP_MFDCR 323
#define XOP_MTDCRX 387
#define XOP_MTDCR 451
@ -51,6 +52,43 @@ static int emulate_mtdcr(struct kvm_vcpu *vcpu, int rs, int dcrn)
}
}
static int emulate_mfdcr(struct kvm_vcpu *vcpu, int rt, int dcrn)
{
/* 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:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
break;
case DCRN_CPR0_CONFIG_DATA:
local_irq_disable();
mtdcr(DCRN_CPR0_CONFIG_ADDR,
vcpu->arch.cpr0_cfgaddr);
kvmppc_set_gpr(vcpu, rt,
mfdcr(DCRN_CPR0_CONFIG_DATA));
local_irq_enable();
break;
default:
vcpu->run->dcr.dcrn = dcrn;
vcpu->run->dcr.data = 0;
vcpu->run->dcr.is_write = 0;
vcpu->arch.io_gpr = rt;
vcpu->arch.dcr_needed = 1;
kvmppc_account_exit(vcpu, DCR_EXITS);
return EMULATE_DO_DCR;
}
return EMULATE_DONE;
}
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
@ -68,38 +106,12 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
switch (get_xop(inst)) {
case XOP_MFDCR:
/* 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:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
break;
case DCRN_CPR0_CONFIG_DATA:
local_irq_disable();
mtdcr(DCRN_CPR0_CONFIG_ADDR,
vcpu->arch.cpr0_cfgaddr);
kvmppc_set_gpr(vcpu, 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;
kvmppc_account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR;
}
emulated = emulate_mfdcr(vcpu, rt, dcrn);
break;
case XOP_MFDCRX:
emulated = emulate_mfdcr(vcpu, rt,
kvmppc_get_gpr(vcpu, ra));
break;
case XOP_MTDCR: