[Qemu-devel] [PATCH 6/8] s390: Wire up channel I/O in kvm.

[Cornelia Huck]

Trigger the code for our virtual css in case of instruction
intercepts for I/O instructions.

Handle the tsch exit for the subchannel-related part of tsch.

Signed-off-by: Cornelia Huck <address@hidden>
---
 target-s390x/cpu.h |  11 +++
 target-s390x/kvm.c | 246 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 244 insertions(+), 13 deletions(-)

diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index eb24c6b..1d21ca8 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -1178,6 +1178,13 @@ uint32_t set_cc_nz_f64(float64 v);
 /* misc_helper.c */
 void program_interrupt(CPUS390XState *env, uint32_t code, int ilc);
 
+#ifdef CONFIG_KVM
+int kvm_s390_io_interrupt(CPUS390XState *env, uint16_t subchannel_id,
+                          uint16_t subchannel_nr, uint32_t io_int_parm,
+                          uint32_t io_int_word);
+int kvm_s390_crw_mchk(CPUS390XState *env);
+void kvm_s390_enable_css_support(CPUS390XState *env);
+#else
 static inline int kvm_s390_io_interrupt(CPUS390XState *env,
                                         uint16_t subchannel_id,
                                         uint16_t subchannel_nr,
@@ -1190,6 +1197,10 @@ static inline int kvm_s390_crw_mchk(CPUS390XState *env)
 {
     return -EOPNOTSUPP;
 }
+static inline void kvm_s390_enable_css_support(CPUS390XState *env)
+{
+}
+#endif
 
 static inline void s390_io_interrupt(CPUS390XState *env,
                                      uint16_t subchannel_id,
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 94de764..c9a4a7d 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -30,6 +30,7 @@
 #include "kvm.h"
 #include "cpu.h"
 #include "device_tree.h"
+#include "ioinst.h"
 
 /* #define DEBUG_KVM */
 
@@ -43,9 +44,27 @@
 
 #define IPA0_DIAG                       0x8300
 #define IPA0_SIGP                       0xae00
-#define IPA0_PRIV                       0xb200
+#define IPA0_B2                         0xb200
+#define IPA0_B9                         0xb900
+#define IPA0_EB                         0xeb00
 
 #define PRIV_SCLP_CALL                  0x20
+#define PRIV_CSCH                       0x30
+#define PRIV_HSCH                       0x31
+#define PRIV_MSCH                       0x32
+#define PRIV_SSCH                       0x33
+#define PRIV_STSCH                      0x34
+#define PRIV_TSCH                       0x35
+#define PRIV_TPI                        0x36
+#define PRIV_SAL                        0x37
+#define PRIV_RSCH                       0x38
+#define PRIV_STCRW                      0x39
+#define PRIV_STCPS                      0x3a
+#define PRIV_RCHP                       0x3b
+#define PRIV_SCHM                       0x3c
+#define PRIV_CHSC                       0x5f
+#define PRIV_SIGA                       0x74
+#define PRIV_XSCH                       0x76
 #define DIAG_KVM_HYPERCALL              0x500
 #define DIAG_KVM_BREAKPOINT             0x501
 
@@ -350,10 +369,120 @@ static int kvm_sclp_service_call(CPUS390XState *env, 
struct kvm_run *run,
     return 0;
 }
 
-static int handle_priv(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
+static int kvm_handle_css_inst(CPUS390XState *env, struct kvm_run *run,
+                               uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
+{
+    int r = 0;
+    int no_cc = 0;
+
+    if (ipa0 != 0xb2) {
+        /* Not handled for now. */
+        return -1;
+    }
+    cpu_synchronize_state(env);
+    switch (ipa1) {
+    case PRIV_XSCH:
+        r = ioinst_handle_xsch(env, env->regs[1]);
+        break;
+    case PRIV_CSCH:
+        r = ioinst_handle_csch(env, env->regs[1]);
+        break;
+    case PRIV_HSCH:
+        r = ioinst_handle_hsch(env, env->regs[1]);
+        break;
+    case PRIV_MSCH:
+        r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
+        break;
+    case PRIV_SSCH:
+        r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
+        break;
+    case PRIV_STCRW:
+        r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
+        break;
+    case PRIV_STSCH:
+        r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
+        break;
+    case PRIV_TSCH:
+        /* We should only get tsch via KVM_EXIT_S390_TSCH. */
+        fprintf(stderr, "Spurious tsch intercept\n");
+        break;
+    case PRIV_CHSC:
+        r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
+        break;
+    case PRIV_TPI:
+        /* This should have been handled by kvm already. */
+        fprintf(stderr, "Spurious tpi intercept\n");
+        break;
+    case PRIV_SCHM:
+        no_cc = 1;
+        r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
+                               run->s390_sieic.ipb);
+        break;
+    case PRIV_RSCH:
+        r = ioinst_handle_rsch(env, env->regs[1]);
+        break;
+    case PRIV_RCHP:
+        r = ioinst_handle_rchp(env, env->regs[1]);
+        break;
+    case PRIV_STCPS:
+        /* We do not provide this instruction, it is suppressed. */
+        no_cc = 1;
+        r = 0;
+        break;
+    case PRIV_SAL:
+        no_cc = 1;
+        r = ioinst_handle_sal(env, env->regs[1]);
+        break;
+    default:
+        r = -1;
+        break;
+    }
+
+    if (r >= 0) {
+        if (!no_cc) {
+            setcc(env, r);
+        }
+        r = 0;
+    } else if (r < -1) {
+        r = 0;
+    }
+    return r;
+}
+
+static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
+{
+    int ret = 0;
+
+    switch (ipa0) {
+    case 0xb2:
+        if (((ipa1 >= 0x30) && (ipa1 <= 0x3c)) ||
+            (ipa1 == 0x5f) ||
+            (ipa1 == 0x74) ||
+            (ipa1 == 0x76)) {
+            ret = 1;
+        }
+        break;
+    case 0xb9:
+        if (ipa1 == 0x9c) {
+            ret = 1;
+        }
+        break;
+    case 0xeb:
+        if (ipb == 0x8a) {
+            ret = 1;
+        }
+        break;
+    }
+
+    return ret;
+}
+
+static int handle_priv(CPUS390XState *env, struct kvm_run *run,
+                       uint8_t ipa0, uint8_t ipa1)
 {
     int r = 0;
     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
+    uint8_t ipb = run->s390_sieic.ipb & 0xff;
 
     dprintf("KVM: PRIV: %d\n", ipa1);
     switch (ipa1) {
@@ -361,8 +490,16 @@ static int handle_priv(CPUS390XState *env, struct kvm_run 
*run, uint8_t ipa1)
             r = kvm_sclp_service_call(env, run, ipbh0);
             break;
         default:
-            dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
-            r = -1;
+            if (is_ioinst(ipa0, ipa1, ipb)) {
+                r = kvm_handle_css_inst(env, run, ipa0, ipa1, ipb);
+                if (r == -1) {
+                    setcc(env, 3);
+                    r = 0;
+                }
+            } else {
+                dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
+                r = -1;
+            }
             break;
     }
 
@@ -500,15 +637,17 @@ static int handle_instruction(CPUS390XState *env, struct 
kvm_run *run)
 
     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, 
run->s390_sieic.ipb);
     switch (ipa0) {
-        case IPA0_PRIV:
-            r = handle_priv(env, run, ipa1);
-            break;
-        case IPA0_DIAG:
-            r = handle_diag(env, run, ipb_code);
-            break;
-        case IPA0_SIGP:
-            r = handle_sigp(env, run, ipa1);
-            break;
+    case IPA0_B2:
+    case IPA0_B9:
+    case IPA0_EB:
+        r = handle_priv(env, run, ipa0 >> 8, ipa1);
+        break;
+    case IPA0_DIAG:
+        r = handle_diag(env, run, ipb_code);
+        break;
+    case IPA0_SIGP:
+        r = handle_sigp(env, run, ipa1);
+        break;
     }
 
     if (r < 0) {
@@ -565,6 +704,38 @@ static int handle_intercept(CPUS390XState *env)
     return r;
 }
 
+static int handle_tsch(CPUS390XState *env, struct kvm_run *run, int dequeued,
+                       uint16_t subchannel_id, uint16_t subchannel_nr,
+                       uint32_t io_int_parm, uint32_t io_int_word)
+{
+    int ret;
+
+    cpu_synchronize_state(env);
+    ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
+    if (ret >= 0) {
+        /* Success; set condition code. */
+        setcc(env, ret);
+        ret = 0;
+    } else if (ret < -1) {
+        /*
+         * Failure.
+         * If an I/O interrupt had been dequeued, we have to reinject it.
+         */
+        if (dequeued) {
+            uint32_t type = ((subchannel_id & 0xff00) << 24) |
+                ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
+
+            kvm_s390_interrupt_internal(env, type,
+                                        ((uint32_t)subchannel_id << 16)
+                                        | subchannel_nr,
+                                        ((uint64_t)io_int_parm << 32)
+                                        | io_int_word, 1);
+        }
+        ret = 0;
+    }
+    return ret;
+}
+
 int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run)
 {
     int ret = 0;
@@ -576,6 +747,13 @@ int kvm_arch_handle_exit(CPUS390XState *env, struct 
kvm_run *run)
         case KVM_EXIT_S390_RESET:
             qemu_system_reset_request();
             break;
+        case KVM_EXIT_S390_TSCH:
+            ret = handle_tsch(env, run, run->s390_tsch.dequeued,
+                              run->s390_tsch.subchannel_id,
+                              run->s390_tsch.subchannel_nr,
+                              run->s390_tsch.io_int_parm,
+                              run->s390_tsch.io_int_word);
+            break;
         default:
             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
             break;
@@ -601,3 +779,45 @@ int kvm_arch_on_sigbus(int code, void *addr)
 {
     return 1;
 }
+
+int kvm_s390_io_interrupt(CPUS390XState *env, uint16_t subchannel_id,
+                          uint16_t subchannel_nr, uint32_t io_int_parm,
+                          uint32_t io_int_word)
+{
+    uint32_t type;
+
+    if (!kvm_enabled()) {
+        return -EOPNOTSUPP;
+    }
+
+    type = ((subchannel_id & 0xff00) << 24) |
+        ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
+    kvm_s390_interrupt_internal(env, type,
+                                ((uint32_t)subchannel_id << 16) | 
subchannel_nr,
+                                ((uint64_t)io_int_parm << 32) | io_int_word, 
1);
+    return 0;
+}
+
+int kvm_s390_crw_mchk(CPUS390XState *env)
+{
+    if (!kvm_enabled()) {
+        return -EOPNOTSUPP;
+    }
+
+    kvm_s390_interrupt_internal(env, KVM_S390_MCHK, 1 << 28,
+                                0x00400f1d40330000, 1);
+    return 0;
+}
+
+void kvm_s390_enable_css_support(CPUS390XState *env)
+{
+    struct kvm_enable_cap cap = {};
+    int r;
+
+    /* Activate host kernel channel subsystem support. */
+    if (kvm_enabled()) {
+        cap.cap = KVM_CAP_S390_CSS_SUPPORT;
+        r = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &cap);
+        assert(r == 0);
+    }
+}
-- 
1.7.12.4