[PATCH v6 16/28] s390x: Guest support for Secure-IPL Facility

[Zhuoying Cai <zycai@linux.ibm.com>]

Introduce Secure-IPL (SIPL) facility.

Use fac_ipl to represent bytes 136 and 137 for IPL device facilities
of the SCLP Read Info block.

Availability of SIPL facility is determined by byte 136 bit 1 of the
SCLP Read Info block. Byte 136's facilities cannot be represented
without the availability of the extended-length-SCCB, so add it as a
check for consistency.

Secure IPL is not available for guests under protected virtualization.

This feature is available starting with the gen16 CPU model.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
Reviewed-by: Collin Walling <walling@linux.ibm.com>
---
 hw/s390x/sclp.c                     | 2 ++
 include/hw/s390x/sclp.h             | 4 +++-
 target/s390x/cpu_features.c         | 4 ++++
 target/s390x/cpu_features.h         | 1 +
 target/s390x/cpu_features_def.h.inc | 3 +++
 target/s390x/cpu_models.c           | 2 ++
 target/s390x/gen-features.c         | 2 ++
 target/s390x/kvm/kvm.c              | 3 +++
 8 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 9718564fa4..69d3328a3d 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -145,6 +145,8 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
     if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
         s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134,
                             &read_info->fac134);
+        s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC_IPL,
+                            read_info->fac_ipl);
     }
 
     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h
index d32f6180e0..bfd330c340 100644
--- a/include/hw/s390x/sclp.h
+++ b/include/hw/s390x/sclp.h
@@ -136,7 +136,9 @@ typedef struct ReadInfo {
     uint32_t hmfai;
     uint8_t  _reserved7[134 - 128];     /* 128-133 */
     uint8_t  fac134;
-    uint8_t  _reserved8[144 - 135];     /* 135-143 */
+    uint8_t  _reserved8;
+    uint8_t  fac_ipl[2];                /* 136-137 */
+    uint8_t  _reserved9[144 - 137];     /* 138-143 */
     struct CPUEntry entries[];
     /*
      * When the Extended-Length SCCB (ELS) feature is enabled the
diff --git a/target/s390x/cpu_features.c b/target/s390x/cpu_features.c
index 436471f4b4..200bd8c15b 100644
--- a/target/s390x/cpu_features.c
+++ b/target/s390x/cpu_features.c
@@ -119,6 +119,7 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
      * Some facilities are not available for CPUs in protected mode:
      * - All SIE facilities because SIE is not available
      * - DIAG318
+     * - Secure IPL Facility
      *
      * As VMs can move in and out of protected mode the CPU model
      * doesn't protect us from that problem because it is only
@@ -149,6 +150,9 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
         clear_be_bit(s390_feat_def(S390_FEAT_DIAG_318)->bit, data);
         clear_be_bit(s390_feat_def(S390_FEAT_CERT_STORE)->bit, data);
         break;
+    case S390_FEAT_TYPE_SCLP_FAC_IPL:
+        clear_be_bit(s390_feat_def(S390_FEAT_SIPL)->bit, data);
+        break;
     default:
         return;
     }
diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h
index 5635839d03..b038198555 100644
--- a/target/s390x/cpu_features.h
+++ b/target/s390x/cpu_features.h
@@ -24,6 +24,7 @@ typedef enum {
     S390_FEAT_TYPE_SCLP_CONF_CHAR,
     S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
     S390_FEAT_TYPE_SCLP_FAC134,
+    S390_FEAT_TYPE_SCLP_FAC_IPL,
     S390_FEAT_TYPE_SCLP_CPU,
     S390_FEAT_TYPE_MISC,
     S390_FEAT_TYPE_PLO,
diff --git a/target/s390x/cpu_features_def.h.inc b/target/s390x/cpu_features_def.h.inc
index 941a69e013..55eef618b8 100644
--- a/target/s390x/cpu_features_def.h.inc
+++ b/target/s390x/cpu_features_def.h.inc
@@ -140,6 +140,9 @@ DEF_FEAT(SIE_IBS, "ibs", SCLP_CONF_CHAR_EXT, 10, "SIE: Interlock-and-broadcast-s
 DEF_FEAT(DIAG_318, "diag318", SCLP_FAC134, 0, "Control program name and version codes")
 DEF_FEAT(CERT_STORE, "cstore", SCLP_FAC134, 5, "Provide Certificate Store functions")
 
+/* Features exposed via SCLP SCCB Facilities byte 136 - 137 (bit numbers relative to byte-136) */
+DEF_FEAT(SIPL, "sipl", SCLP_FAC_IPL, 1, "Secure-IPL facility")
+
 /* Features exposed via SCLP CPU info. */
 DEF_FEAT(SIE_F2, "sief2", SCLP_CPU, 4, "SIE: interception format 2 (Virtual SIE)")
 DEF_FEAT(SIE_SKEY, "skey", SCLP_CPU, 5, "SIE: Storage-key facility")
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index 6b8471700e..f99536ef9a 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -263,6 +263,7 @@ bool s390_has_feat(S390Feat feat)
         case S390_FEAT_SIE_CMMA:
         case S390_FEAT_SIE_PFMFI:
         case S390_FEAT_SIE_IBS:
+        case S390_FEAT_SIPL:
         case S390_FEAT_CONFIGURATION_TOPOLOGY:
             return false;
             break;
@@ -507,6 +508,7 @@ static void check_consistency(const S390CPUModel *model)
         { S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, S390_FEAT_AP },
         { S390_FEAT_DIAG_318, S390_FEAT_EXTENDED_LENGTH_SCCB },
         { S390_FEAT_CERT_STORE, S390_FEAT_EXTENDED_LENGTH_SCCB },
+        { S390_FEAT_SIPL, S390_FEAT_EXTENDED_LENGTH_SCCB },
         { S390_FEAT_NNPA, S390_FEAT_VECTOR },
         { S390_FEAT_RDP, S390_FEAT_LOCAL_TLB_CLEARING },
         { S390_FEAT_UV_FEAT_AP, S390_FEAT_AP },
diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
index 6c20c3a862..bd2060ab93 100644
--- a/target/s390x/gen-features.c
+++ b/target/s390x/gen-features.c
@@ -721,6 +721,7 @@ static uint16_t full_GEN16_GA1[] = {
     S390_FEAT_UV_FEAT_AP,
     S390_FEAT_UV_FEAT_AP_INTR,
     S390_FEAT_CERT_STORE,
+    S390_FEAT_SIPL,
 };
 
 static uint16_t full_GEN17_GA1[] = {
@@ -922,6 +923,7 @@ static uint16_t qemu_MAX[] = {
     S390_FEAT_PRNO_TRNG,
     S390_FEAT_EXTENDED_LENGTH_SCCB,
     S390_FEAT_CERT_STORE,
+    S390_FEAT_SIPL,
 };
 
 /****** END FEATURE DEFS ******/
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index ae6cd3d506..31bd574dec 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -2520,6 +2520,9 @@ bool kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
 
     set_bit(S390_FEAT_CERT_STORE, model->features);
 
+    /* Some Secure IPL facilities are emulated by QEMU */
+    set_bit(S390_FEAT_SIPL, model->features);
+
     /* Test for Ultravisor features that influence secure guest behavior */
     query_uv_feat_guest(model->features);
 
-- 
2.50.1