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author | Alexander Graf <agraf@suse.de> | 2012-08-16 00:34:58 +0200 |
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committer | Alexander Graf <agraf@suse.de> | 2012-10-05 23:38:49 +0200 |
commit | ceb985f9d18cba2efdef08b8d31751c2c2b20d77 (patch) | |
tree | e01a89642eb8137dbf16c4b131bd7faf63c66271 /arch/powerpc/kvm/44x_emulate.c | |
parent | KVM: PPC: 440: Implement mtdcrx (diff) | |
download | linux-ceb985f9d18cba2efdef08b8d31751c2c2b20d77.tar.xz linux-ceb985f9d18cba2efdef08b8d31751c2c2b20d77.zip |
KVM: PPC: 440: Implement mfdcrx
We need mfdcrx to execute properly on 460 cores.
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/kvm/44x_emulate.c | 74 |
1 files changed, 43 insertions, 31 deletions
diff --git a/arch/powerpc/kvm/44x_emulate.c b/arch/powerpc/kvm/44x_emulate.c index 3843a75e3e98..1a793c4c4a67 100644 --- a/arch/powerpc/kvm/44x_emulate.c +++ b/arch/powerpc/kvm/44x_emulate.c @@ -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: |