[GIT PULL 10/10] KVM: s390: Populate mask of non-hypervisor managed facility bits

Christian Borntraeger
2016-05-09T09:20:21Z

From: Alexander Yarygin <yarygin@linux.vnet.ibm.com>

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>
---
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 5fe6605..c597201 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);
}

--
2.5.5