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KVM: PPC: Book3S PR: Add emulation for treclaim.

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This patch adds support for "treclaim." emulation when PR KVM guest
executes treclaim. and traps to host.

We will firstly do treclaim. and save TM checkpoint. Then it is
necessary to update vcpu current reg content with checkpointed vals.
When rfid into guest again, those vcpu current reg content (now the
checkpoint vals) will be loaded into regs.

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Simon Guo 2018-05-23 15:02:03 +08:00 committed by Paul Mackerras
parent 19c585eb45
commit 03c81682a9
1 changed files with 76 additions and 0 deletions
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76
arch/powerpc/kvm/book3s_emulate.c
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@ -51,6 +51,8 @@
#define OP_31_XOP_TBEGIN 654
#define OP_31_XOP_TRECLAIM 942
/* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
#define OP_31_XOP_DCBZ 1010
@ -130,6 +132,46 @@ static inline void kvmppc_copyfrom_vcpu_tm(struct kvm_vcpu *vcpu)
vcpu->arch.vrsave = vcpu->arch.vrsave_tm;
}
static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
{
unsigned long guest_msr = kvmppc_get_msr(vcpu);
int fc_val = ra_val ? ra_val : 1;
/* CR0 = 0 | MSR[TS] | 0 */
vcpu->arch.cr = (vcpu->arch.cr & ~(CR0_MASK << CR0_SHIFT)) |
(((guest_msr & MSR_TS_MASK) >> (MSR_TS_S_LG - 1))
<< CR0_SHIFT);
preempt_disable();
kvmppc_save_tm_pr(vcpu);
kvmppc_copyfrom_vcpu_tm(vcpu);
tm_enable();
vcpu->arch.texasr = mfspr(SPRN_TEXASR);
/* failure recording depends on Failure Summary bit */
if (!(vcpu->arch.texasr & TEXASR_FS)) {
vcpu->arch.texasr &= ~TEXASR_FC;
vcpu->arch.texasr |= ((u64)fc_val << TEXASR_FC_LG);
vcpu->arch.texasr &= ~(TEXASR_PR | TEXASR_HV);
if (kvmppc_get_msr(vcpu) & MSR_PR)
vcpu->arch.texasr |= TEXASR_PR;
if (kvmppc_get_msr(vcpu) & MSR_HV)
vcpu->arch.texasr |= TEXASR_HV;
vcpu->arch.tfiar = kvmppc_get_pc(vcpu);
mtspr(SPRN_TEXASR, vcpu->arch.texasr);
mtspr(SPRN_TFIAR, vcpu->arch.tfiar);
}
tm_disable();
/*
* treclaim need quit to non-transactional state.
*/
guest_msr &= ~(MSR_TS_MASK);
kvmppc_set_msr(vcpu, guest_msr);
preempt_enable();
}
#endif
int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
@ -402,6 +444,40 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
emulated = EMULATE_FAIL;
break;
}
case OP_31_XOP_TRECLAIM:
{
ulong guest_msr = kvmppc_get_msr(vcpu);
unsigned long ra_val = 0;
if (!cpu_has_feature(CPU_FTR_TM))
break;
if (!(kvmppc_get_msr(vcpu) & MSR_TM)) {
kvmppc_trigger_fac_interrupt(vcpu, FSCR_TM_LG);
emulated = EMULATE_AGAIN;
break;
}
/* generate interrupts based on priorities */
if (guest_msr & MSR_PR) {
/* Privileged Instruction type Program Interrupt */
kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
emulated = EMULATE_AGAIN;
break;
}
if (!MSR_TM_ACTIVE(guest_msr)) {
/* TM bad thing interrupt */
kvmppc_core_queue_program(vcpu, SRR1_PROGTM);
emulated = EMULATE_AGAIN;
break;
}
if (ra)
ra_val = kvmppc_get_gpr(vcpu, ra);
kvmppc_emulate_treclaim(vcpu, ra_val);
break;
}
#endif
default:
emulated = EMULATE_FAIL;