[PATCH 14/15] s390x: protvirt: Disable address checks for PV guest IO emulation

[Janosch Frank]

IO instruction data is routed through SIDAD for protected guests, so
adresses do not need to be checked, as this is kernel memory.

Signed-off-by: Janosch Frank <fran...@linux.ibm.com>
---
 target/s390x/ioinst.c | 46 +++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
index c437a1d8c6..d3bd422ddd 100644
--- a/target/s390x/ioinst.c
+++ b/target/s390x/ioinst.c
@@ -110,11 +110,13 @@ void ioinst_handle_msch(S390CPU *cpu, uint64_t reg1, 
uint32_t ipb, uintptr_t ra)
     int cssid, ssid, schid, m;
     SubchDev *sch;
     SCHIB schib;
-    uint64_t addr;
+    uint64_t addr = 0;
     CPUS390XState *env = &cpu->env;
-    uint8_t ar;
+    uint8_t ar = 0;
 
-    addr = decode_basedisp_s(env, ipb, &ar);
+    if (!env->pv) {
+        addr = decode_basedisp_s(env, ipb, &ar);
+    }
     if (addr & 3) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
@@ -167,11 +169,13 @@ void ioinst_handle_ssch(S390CPU *cpu, uint64_t reg1, 
uint32_t ipb, uintptr_t ra)
     int cssid, ssid, schid, m;
     SubchDev *sch;
     ORB orig_orb, orb;
-    uint64_t addr;
+    uint64_t addr = 0;
     CPUS390XState *env = &cpu->env;
-    uint8_t ar;
+    uint8_t ar = 0;
 
-    addr = decode_basedisp_s(env, ipb, &ar);
+    if (!env->pv) {
+        addr = decode_basedisp_s(env, ipb, &ar);
+    }
     if (addr & 3) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
@@ -198,12 +202,14 @@ void ioinst_handle_ssch(S390CPU *cpu, uint64_t reg1, 
uint32_t ipb, uintptr_t ra)
 void ioinst_handle_stcrw(S390CPU *cpu, uint32_t ipb, uintptr_t ra)
 {
     CRW crw;
-    uint64_t addr;
+    uint64_t addr = 0;
     int cc;
     CPUS390XState *env = &cpu->env;
-    uint8_t ar;
+    uint8_t ar = 0;
 
-    addr = decode_basedisp_s(env, ipb, &ar);
+    if (!env->pv) {
+        addr = decode_basedisp_s(env, ipb, &ar);
+    }
     if (addr & 3) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
@@ -228,13 +234,15 @@ void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, 
uint32_t ipb,
 {
     int cssid, ssid, schid, m;
     SubchDev *sch;
-    uint64_t addr;
+    uint64_t addr = 0;
     int cc;
     SCHIB schib;
     CPUS390XState *env = &cpu->env;
-    uint8_t ar;
+    uint8_t ar = 0;
 
-    addr = decode_basedisp_s(env, ipb, &ar);
+    if (!env->pv) {
+        addr = decode_basedisp_s(env, ipb, &ar);
+    }
     if (addr & 3) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
@@ -294,16 +302,18 @@ int ioinst_handle_tsch(S390CPU *cpu, uint64_t reg1, 
uint32_t ipb, uintptr_t ra)
     int cssid, ssid, schid, m;
     SubchDev *sch;
     IRB irb;
-    uint64_t addr;
+    uint64_t addr = 0;
     int cc, irb_len;
-    uint8_t ar;
+    uint8_t ar = 0;
 
     if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
         s390_program_interrupt(env, PGM_OPERAND, ra);
         return -EIO;
     }
     trace_ioinst_sch_id("tsch", cssid, ssid, schid);
-    addr = decode_basedisp_s(env, ipb, &ar);
+    if (!env->pv) {
+        addr = decode_basedisp_s(env, ipb, &ar);
+    }
     if (addr & 3) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return -EIO;
@@ -601,7 +611,7 @@ void ioinst_handle_chsc(S390CPU *cpu, uint32_t ipb, 
uintptr_t ra)
 {
     ChscReq *req;
     ChscResp *res;
-    uint64_t addr;
+    uint64_t addr = 0;
     int reg;
     uint16_t len;
     uint16_t command;
@@ -610,7 +620,9 @@ void ioinst_handle_chsc(S390CPU *cpu, uint32_t ipb, 
uintptr_t ra)
 
     trace_ioinst("chsc");
     reg = (ipb >> 20) & 0x00f;
-    addr = env->regs[reg];
+    if (!env->pv) {
+        addr = env->regs[reg];
+    }
     /* Page boundary? */
     if (addr & 0xfff) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
-- 
2.20.1