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KVM: PPC: BookE: Add EPR ONE_REG sync 

We need to be able to read and write the contents of the EPR register
from user space.

This patch implements that logic through the ONE_REG API and declares
its (never implemented) SREGS counterpart as deprecated.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2013-01-04 18:28:51 +01:00
parent 1c81063655
commit 324b3e6316
3 changed files with 27 additions and 1 deletions
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1
Documentation/virtual/kvm/api.txt
View File

@ -1774,6 +1774,7 @@ registers, find a list below:
PPC | KVM_REG_PPC_VPA_SLB | 128
PPC | KVM_REG_PPC_VPA_DTL | 128
PPC | KVM_REG_PPC_EPCR | 32
PPC | KVM_REG_PPC_EPR | 32
4.69 KVM_GET_ONE_REG

6
arch/powerpc/include/uapi/asm/kvm.h
View File

@ -114,7 +114,10 @@ struct kvm_regs {
/* Embedded Floating Point (SPE) -- IVOR32-34 if KVM_SREGS_E_IVOR */
#define KVM_SREGS_E_SPE (1 << 9)
/* External Proxy (EXP) -- EPR */
/*
* DEPRECATED! USE ONE_REG FOR THIS ONE!
* External Proxy (EXP) -- EPR
*/
#define KVM_SREGS_EXP (1 << 10)
/* External PID (E.PD) -- EPSC/EPLC */
@ -412,5 +415,6 @@ struct kvm_get_htab_header {
#define KVM_REG_PPC_VPA_DTL (KVM_REG_PPC | KVM_REG_SIZE_U128 | 0x84)
#define KVM_REG_PPC_EPCR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x85)
#define KVM_REG_PPC_EPR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x86)
#endif /* __LINUX_KVM_POWERPC_H */

21
arch/powerpc/kvm/booke.c
View File

@ -300,6 +300,15 @@ static void set_guest_esr(struct kvm_vcpu *vcpu, u32 esr)
#endif
}
static unsigned long get_guest_epr(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_KVM_BOOKE_HV
return mfspr(SPRN_GEPR);
#else
return vcpu->arch.epr;
#endif
}
/* Deliver the interrupt of the corresponding priority, if possible. */
static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
unsigned int priority)
@ -1405,6 +1414,11 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
&vcpu->arch.dbg_reg.dac[dac], sizeof(u64));
break;
}
case KVM_REG_PPC_EPR: {
u32 epr = get_guest_epr(vcpu);
r = put_user(epr, (u32 __user *)(long)reg->addr);
break;
}
#if defined(CONFIG_64BIT)
case KVM_REG_PPC_EPCR:
r = put_user(vcpu->arch.epcr, (u32 __user *)(long)reg->addr);
@ -1437,6 +1451,13 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
(u64 __user *)(long)reg->addr, sizeof(u64));
break;
}
case KVM_REG_PPC_EPR: {
u32 new_epr;
r = get_user(new_epr, (u32 __user *)(long)reg->addr);
if (!r)
kvmppc_set_epr(vcpu, new_epr);
break;
}
#if defined(CONFIG_64BIT)
case KVM_REG_PPC_EPCR: {
u32 new_epcr;