[Qemu-devel] [PATCH 3/7] s390x/pci: rework PCI LOAD

[Pierre Morel <pmorel@linux.vnet.ibm.com>]

Enhance the fault detection, correction of the fault reporting.

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
---
 hw/s390x/s390-pci-inst.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 4a2f996..62ebaa0 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -372,6 +372,11 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
     len = env->regs[r2] & 0xf;
     offset = env->regs[r2 + 1];
 
+    if (!(fh & FH_MASK_ENABLE)) {
+        setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
+        return 0;
+    }
+
     pbdev = s390_pci_find_dev_by_fh(s390_get_phb(), fh);
     if (!pbdev) {
         DPRINTF("pcilg no pci dev\n");
@@ -380,12 +385,7 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
     }
 
     switch (pbdev->state) {
-    case ZPCI_FS_RESERVED:
-    case ZPCI_FS_STANDBY:
-    case ZPCI_FS_DISABLED:
     case ZPCI_FS_PERMANENT_ERROR:
-        setcc(cpu, ZPCI_PCI_LS_INVAL_HANDLE);
-        return 0;
     case ZPCI_FS_ERROR:
         setcc(cpu, ZPCI_PCI_LS_ERR);
         s390_set_status_code(env, r2, ZPCI_PCI_ST_BLOCKED);
@@ -394,8 +394,9 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
         break;
     }
 
-    if (pcias < 6) {
-        if ((8 - (offset & 0x7)) < len) {
+    switch (pcias) {
+    case 0 ... 5:
+        if (!len || (len > (8 - (offset & 0x7)))) {
             program_interrupt(env, PGM_OPERAND, 4);
             return 0;
         }
@@ -406,8 +407,9 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
             program_interrupt(env, PGM_OPERAND, 4);
             return 0;
         }
-    } else if (pcias == 15) {
-        if ((4 - (offset & 0x3)) < len) {
+        break;
+    case 15:
+        if (!len || (len > (4 - (offset & 0x3))) || len == 3) {
             program_interrupt(env, PGM_OPERAND, 4);
             return 0;
         }
@@ -418,8 +420,11 @@ int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
             program_interrupt(env, PGM_OPERAND, 4);
             return 0;
         }
-    } else {
-        DPRINTF("invalid space\n");
+        break;
+    case PCI_ROM_SLOT:
+        /* Fall through */
+    default:
+        DPRINTF("pcilg invalid space\n");
         setcc(cpu, ZPCI_PCI_LS_ERR);
         s390_set_status_code(env, r2, ZPCI_PCI_ST_INVAL_AS);
         return 0;
-- 
2.7.4