[PULL 04/51] KVM: PPC: Book3S: Add GET/SET_ONE_REG interface for VRSAVE

Alexander Graf
2013-10-31T21:18:41Z

The VRSAVE register value for a vcpu is accessible through the
GET/SET_SREGS interface for Book E processors, but not for Book 3S
processors. In order to make this accessible for Book 3S processors,
this adds a new register identifier for GET/SET_ONE_REG, and adds
the code to implement it.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
Documentation/virtual/kvm/api.txt | 1 +
arch/powerpc/include/uapi/asm/kvm.h | 2 ++
arch/powerpc/kvm/book3s.c | 10 ++++++++++
3 files changed, 13 insertions(+)

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index e43c6f1..26fc373 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1834,6 +1834,7 @@ registers, find a list below:
PPC | KVM_REG_PPC_TCSCR | 64
PPC | KVM_REG_PPC_PID | 64
PPC | KVM_REG_PPC_ACOP | 64
+ PPC | KVM_REG_PPC_VRSAVE | 32
PPC | KVM_REG_PPC_TM_GPR0 | 64
...
PPC | KVM_REG_PPC_TM_GPR31 | 64
diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index a8124fe..b98bf3f 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -532,6 +532,8 @@ struct kvm_get_htab_header {
#define KVM_REG_PPC_PID (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xb2)
#define KVM_REG_PPC_ACOP (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xb3)

+#define KVM_REG_PPC_VRSAVE (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0xb4)
+
/* Transactional Memory checkpointed state:
* This is all GPRs, all VSX regs and a subset of SPRs
*/
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 700df6f..f97369d 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -528,6 +528,9 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
}
val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]);
break;
+ case KVM_REG_PPC_VRSAVE:
+ val = get_reg_val(reg->id, vcpu->arch.vrsave);
+ break;
#endif /* CONFIG_ALTIVEC */
case KVM_REG_PPC_DEBUG_INST: {
u32 opcode = INS_TW;
@@ -605,6 +608,13 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
}
vcpu->arch.vscr.u[3] = set_reg_val(reg->id, val);
break;
+ case KVM_REG_PPC_VRSAVE:
+ if (!cpu_has_feature(CPU_FTR_ALTIVEC)) {
+ r = -ENXIO;
+ break;
+ }
+ vcpu->arch.vrsave = set_reg_val(reg->id, val);
+ break;
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_KVM_XICS
case KVM_REG_PPC_ICP_STATE:
--
1.8.1.4