KVM: s390: Enable vector support for capable guest

We finally have all the pieces in place, so let's include the
vector facility bit in the mask of available hardware facilities
for the guest to recognize.  Also, enable the vector functionality
in the guest control blocks, to avoid a possible vector data
exception that would otherwise occur when a vector instruction
is issued by the guest operating system.

Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 3fe2597..347a333 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -172,7 +172,9 @@ struct kvm_s390_sie_block {
        __u32   fac;                    /* 0x01a0 */
        __u8    reserved1a4[20];        /* 0x01a4 */
        __u64   cbrlo;                  /* 0x01b8 */
-       __u8    reserved1c0[30];        /* 0x01c0 */
+       __u8    reserved1c0[8];         /* 0x01c0 */
+       __u32   ecd;                    /* 0x01c8 */
+       __u8    reserved1cc[18];        /* 0x01cc */
        __u64   pp;                     /* 0x01de */
        __u8    reserved1e6[2];         /* 0x01e6 */
        __u64   itdba;                  /* 0x01e8 */

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0c045cf..02e03c8 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -104,6 +104,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 unsigned long kvm_s390_fac_list_mask[] = {
        0xff82fffbf4fc2000UL,
        0x005c000000000000UL,
+       0x4000000000000000UL,
 };
 
 unsigned long kvm_s390_fac_list_mask_size(void)
@@ -1186,6 +1187,10 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
                vcpu->arch.sie_block->eca |= 1;
        if (sclp_has_sigpif())
                vcpu->arch.sie_block->eca |= 0x10000000U;
+       if (vcpu->kvm->arch.use_vectors) {
+               vcpu->arch.sie_block->eca |= 0x00020000;
+               vcpu->arch.sie_block->ecd |= 0x20000000;
+       }
        vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 
        if (kvm_s390_cmma_enabled(vcpu->kvm)) {