From 60a37709ce603da62d0b60699b713558b4cfd513 Mon Sep 17 00:00:00 2001 From: Alexander Yarygin Date: Fri, 1 Apr 2016 15:38:57 +0300 Subject: [PATCH] KVM: s390: Populate mask of non-hypervisor managed facility bits When a guest is initializing, KVM provides facility bits that can be successfully used by the guest. It's done by applying kvm_s390_fac_list_mask mask on host facility bits stored by the STFLE instruction. Facility bits can be one of two kinds: it's either a hypervisor managed bit or non-hypervisor managed. The hardware provides information which bits need special handling. Let's automatically passthrough to guests new facility bits, that don't require hypervisor support. Signed-off-by: Alexander Yarygin Reviewed-by: David Hildenbrand Reviewed-by: Eric Farman Signed-off-by: Christian Borntraeger --- arch/s390/kvm/kvm-s390.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 5fe660528f1a..c597201a5ca9 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -118,9 +118,9 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { }; /* upper facilities limit for kvm */ -unsigned long kvm_s390_fac_list_mask[] = { - 0xffe6ffffffffffffUL, - 0x005effffffffffffUL, +unsigned long kvm_s390_fac_list_mask[16] = { + 0xffe6000000000000UL, + 0x005e000000000000UL, }; unsigned long kvm_s390_fac_list_mask_size(void) @@ -2985,13 +2985,26 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, return; } +static inline unsigned long nonhyp_mask(int i) +{ + unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; + + return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); +} + static int __init kvm_s390_init(void) { + int i; + if (!sclp.has_sief2) { pr_info("SIE not available\n"); return -ENODEV; } + for (i = 0; i < 16; i++) + kvm_s390_fac_list_mask[i] |= + S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i); + return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); } -- GitLab