Introduces a new CPU model feature and two CPU model facilities to support AP virtualization for KVM guests. CPU model feature: The KVM_S390_VM_CPU_FEAT_AP feature indicates that the AP facilities are installed on the KVM guest. This feature will be enabled by the kernel only if the AP facilities are installed on the linux host. This feature must be specifically turned on for the KVM guest from userspace to allow guest access to AP devices installed on the linux host. CPU model facilities: 1. AP Query Configuration Information (QCI) facility is installed. This is indicated by setting facilities bit 12 for the guest. The kernel will not enable this facility for the guest if it is not set on the host. This facility must not be set by userspace if the KVM_S390_VM_CPU_FEAT_AP feature is not installed. 2. AP Facilities Test facility (APFT) is installed. This is indicated by setting facilities bit 15 for the guest. The kernel will not enable this facility for the guest if it is not set on the host. This facility must not be set by userspace if the KVM_S390_VM_CPU_FEAT_AP feature is not installed. Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx> Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx> --- arch/s390/include/uapi/asm/kvm.h | 1 + arch/s390/kvm/kvm-s390.c | 4 ++++ arch/s390/tools/gen_facilities.c | 2 ++ 3 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index 4cdaa55..a580dec 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -130,6 +130,7 @@ struct kvm_s390_vm_cpu_machine { #define KVM_S390_VM_CPU_FEAT_PFMFI 11 #define KVM_S390_VM_CPU_FEAT_SIGPIF 12 #define KVM_S390_VM_CPU_FEAT_KSS 13 +#define KVM_S390_VM_CPU_FEAT_AP 14 struct kvm_s390_vm_cpu_feat { __u64 feat[16]; }; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index de1e299..c68ca86 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -347,6 +347,10 @@ static void kvm_s390_cpu_feat_init(void) if (MACHINE_HAS_ESOP) allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); + + if (ap_instructions_installed()) /* AP instructions installed on host */ + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_AP); + /* * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c index 90a8c9e..a52290b 100644 --- a/arch/s390/tools/gen_facilities.c +++ b/arch/s390/tools/gen_facilities.c @@ -106,6 +106,8 @@ struct facility_def { .name = "FACILITIES_KVM_CPUMODEL", .bits = (int[]){ + 12, /* AP Query Configuration Information */ + 15, /* AP Facilities Test */ -1 /* END */ } }, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html