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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>
This commit is contained in:
Alexander Yarygin 2016-04-01 15:38:57 +03:00 committed by Christian Borntraeger
parent 154fa27e6b
commit 60a37709ce
1 changed files with 16 additions and 3 deletions
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19
arch/s390/kvm/kvm-s390.c
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@ -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);
}