From: Liu Yu-B13201 <Yu.Liu@xxxxxxxxxxxxx>
And add a new flag definition in kvm_ppc_pvinfo to indicate
whether the host supports the EV_IDLE hcall.
Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx>
[stuart.yoder@xxxxxxxxxxxxx: cleanup,fixes for conditions allowing idle]
Signed-off-by: Stuart Yoder <stuart.yoder@xxxxxxxxxxxxx>
---
v12: use EV_HCALL_TOKEN macro
Documentation/virtual/kvm/api.txt | 7 +++++--
arch/powerpc/include/asm/Kbuild | 1 +
arch/powerpc/kvm/powerpc.c | 10 ++++++++--
include/linux/kvm.h | 2 ++
4 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 310fe50..920c3c4 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1190,12 +1190,15 @@ struct kvm_ppc_pvinfo {
This ioctl fetches PV specific information that need to be passed to the guest
using the device tree or other means from vm context.
-For now the only implemented piece of information distributed here is an array
-of 4 instructions that make up a hypercall.
+The hcall array defines 4 instructions that make up a hypercall.
If any additional field gets added to this structure later on, a bit for that
additional piece of information will be set in the flags bitmap.
+The flags bitmap is defined as:
+
+ /* the host supports the ePAPR idle hcall
+ #define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0)
4.48 KVM_ASSIGN_PCI_DEVICE
diff --git a/arch/powerpc/include/asm/Kbuild b/arch/powerpc/include/asm/Kbuild
index 7e313f1..13d6b7b 100644
--- a/arch/powerpc/include/asm/Kbuild
+++ b/arch/powerpc/include/asm/Kbuild
@@ -34,5 +34,6 @@ header-y += termios.h
header-y += types.h
header-y += ucontext.h
header-y += unistd.h
+header-y += epapr_hcalls.h
generic-y += rwsem.h
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 30cf01c..1a4db32 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -38,8 +38,7 @@
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
- return !(v->arch.shared->msr & MSR_WE) ||
- !!(v->arch.pending_exceptions) ||
+ return !!(v->arch.pending_exceptions) ||
v->requests;
}
@@ -86,6 +85,11 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
/* Second return value is in r4 */
break;
+ case EV_HCALL_TOKEN(EV_EPAPR_VENDOR_ID, EV_IDLE):
+ r = EV_SUCCESS;
+ kvm_vcpu_block(vcpu);
+ clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ break;
default:
r = EV_UNIMPLEMENTED;
break;
@@ -767,6 +771,8 @@ static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
pvinfo->hcall[3] = inst_nop;
#endif
+ pvinfo->flags = KVM_PPC_PVINFO_FLAGS_EV_IDLE;
+
return 0;
}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 2ce09aa..c03e59e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -473,6 +473,8 @@ struct kvm_ppc_smmu_info {
struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ];
};
+#define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0)
+
#define KVMIO 0xAE
/* machine type bits, to be used as argument to KVM_CREATE_VM */
--
1.7.3.4
--
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