[PATCH 12/12] KVM: s390: introduce the format-1 GISA

Christian Borntraeger
2018-01-16T20:02:17Z

From: Michael Mueller <mimu@linux.vnet.ibm.com>

The patch modifies the previously defined GISA data structure to be
able to store two GISA formats, format-0 and format-1. Additionally,
it verifies the availability of the GISA format facility and enables
the use of a format-1 GISA in the SIE control block accordingly.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 44 +++++++++++++++++++++++++++++++---------
arch/s390/kvm/kvm-s390.c | 2 ++
2 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 11f15a51bfc7..e6687ab96686 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -228,6 +228,7 @@ struct kvm_s390_sie_block {
__u8 epdx; /* 0x0069 */
__u8 reserved6a[2]; /* 0x006a */
__u32 todpr; /* 0x006c */
+#define GISA_FORMAT1 0x00000001
__u32 gd; /* 0x0070 */
__u8 reserved74[12]; /* 0x0074 */
__u64 mso; /* 0x0080 */
@@ -706,15 +707,38 @@ struct kvm_s390_crypto_cb {
};

struct kvm_s390_gisa {
- u32 next_alert;
- u8 ipm;
- u8 reserved01;
- u8:6;
- u8 g:1;
- u8 c:1;
- u8 iam;
- u8 reserved02[4];
- u32 airq_count;
+ union {
+ struct { /* common to all formats */
+ u32 next_alert;
+ u8 ipm;
+ u8 reserved01[2];
+ u8 iam;
+ };
+ struct { /* format 0 */
+ u32 next_alert;
+ u8 ipm;
+ u8 reserved01;
+ u8:6;
+ u8 g:1;
+ u8 c:1;
+ u8 iam;
+ u8 reserved02[4];
+ u32 airq_count;
+ } g0;
+ struct { /* format 1 */
+ u32 next_alert;
+ u8 ipm;
+ u8 simm;
+ u8 nimm;
+ u8 iam;
+ u8 aism[8];
+ u8:6;
+ u8 g:1;
+ u8 c:1;
+ u8 reserved03[11];
+ u32 airq_count;
+ } g1;
+ };
};

/*
@@ -725,7 +749,7 @@ struct sie_page2 {
__u64 fac_list[S390_ARCH_FAC_LIST_SIZE_U64]; /* 0x0000 */
struct kvm_s390_crypto_cb crycb; /* 0x0800 */
struct kvm_s390_gisa gisa __aligned(sizeof(struct kvm_s390_gisa)); /* 0x0900 */
- u8 reserved910[0x1000 - 0x910]; /* 0x0910 */
+ u8 reserved920[0x1000 - 0x920]; /* 0x0920 */
};

struct kvm_s390_vsie {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 68d7eef44a98..efde2647c2ee 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2518,6 +2518,8 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
vcpu->arch.sie_block->icpua = id;
spin_lock_init(&vcpu->arch.local_int.lock);
vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa;
+ if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
+ vcpu->arch.sie_block->gd |= GISA_FORMAT1;
seqcount_init(&vcpu->arch.cputm_seqcount);

rc = kvm_vcpu_init(vcpu, kvm, id);
--
2.13.4