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 <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 5fe6605..c597201 100644 (file)
--- 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);
 }