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KVM: PPC: Add support for ePAPR idle hcall in host kernel

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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@freescale.com>
[stuart.yoder@freescale.com: cleanup,fixes for conditions allowing idle]
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
[agraf: fix typo]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Liu Yu-B13201 2012-07-03 05:48:52 +00:00 committed by Alexander Graf
parent 784bafac79
commit 9202e07636
4 changed files with 16 additions and 4 deletions
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7
Documentation/virtual/kvm/api.txt
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@ -1194,12 +1194,15 @@ 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

1
arch/powerpc/include/asm/Kbuild
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@ -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

10
arch/powerpc/kvm/powerpc.c
View File

@ -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_IDLE):
r = EV_SUCCESS;
kvm_vcpu_block(vcpu);
clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
break;
default:
r = EV_UNIMPLEMENTED;
break;
@ -779,6 +783,8 @@ 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;
}

2
include/linux/kvm.h
View File

@ -477,6 +477,8 @@ 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 */