diff mbox series

[v6,14/18] s390x: protvirt: Move IO control structures over SIDA

Message ID 20200304114231.23493-15-frankja@linux.ibm.com
State New
Headers show
Series s390x: Protected Virtualization support | expand

Commit Message

Janosch Frank March 4, 2020, 11:42 a.m. UTC 
For protected guests, we need to put the IO emulation results into the
SIDA, so SIE will write them into the guest at the next entry.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 target/s390x/ioinst.c | 87 ++++++++++++++++++++++++++++++-------------
 1 file changed, 61 insertions(+), 26 deletions(-)

Comments

David Hildenbrand March 4, 2020, 6:56 p.m. UTC | #1 
On 04.03.20 12:42, Janosch Frank wrote:
> For protected guests, we need to put the IO emulation results into the
> SIDA, so SIE will write them into the guest at the next entry.
> 

[...]

>  
>      if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
> +        if (env->pv) {
> +            return;
> +        }

Can you elaborate why we don't have to do anything here? I can
understand why we don't/cannot probe for writes. But what about the
PGM_OPERAND?


[...]

Apart from that, looks good to me.
Janosch Frank March 5, 2020, 9:55 a.m. UTC | #2 
On 3/4/20 7:56 PM, David Hildenbrand wrote:
> On 04.03.20 12:42, Janosch Frank wrote:
>> For protected guests, we need to put the IO emulation results into the
>> SIDA, so SIE will write them into the guest at the next entry.
>>
> 
> [...]
> 
>>  
>>      if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
>> +        if (env->pv) {
>> +            return;
>> +        }
> 
> Can you elaborate why we don't have to do anything here? I can
> understand why we don't/cannot probe for writes. But what about the
> PGM_OPERAND?

CSSID and the schid one check are done by the Ultravisor/SIE

> 
> 
> [...]
> 
> Apart from that, looks good to me.
> 
>
David Hildenbrand March 5, 2020, 10:01 a.m. UTC | #3 
On 05.03.20 10:55, Janosch Frank wrote:
> On 3/4/20 7:56 PM, David Hildenbrand wrote:
>> On 04.03.20 12:42, Janosch Frank wrote:
>>> For protected guests, we need to put the IO emulation results into the
>>> SIDA, so SIE will write them into the guest at the next entry.
>>>
>>
>> [...]
>>
>>>  
>>>      if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
>>> +        if (env->pv) {
>>> +            return;
>>> +        }
>>
>> Can you elaborate why we don't have to do anything here? I can
>> understand why we don't/cannot probe for writes. But what about the
>> PGM_OPERAND?
> 
> CSSID and the schid one check are done by the Ultravisor/SIE
> 

So can we even reach this path?
diff mbox series

Patch

diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
index e4102430aa..330b04d79a 100644
--- a/target/s390x/ioinst.c
+++ b/target/s390x/ioinst.c
@@ -129,9 +129,13 @@  void ioinst_handle_msch(S390CPU *cpu, uint64_t reg1, uint32_t ipb, uintptr_t ra)
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
     }
-    if (s390_cpu_virt_mem_read(cpu, addr, ar, &schib, sizeof(schib))) {
-        s390_cpu_virt_mem_handle_exc(cpu, ra);
-        return;
+    if (env->pv) {
+        s390_cpu_pv_mem_read(cpu, addr, &schib, sizeof(schib));
+    } else {
+        if (s390_cpu_virt_mem_read(cpu, addr, ar, &schib, sizeof(schib))) {
+            s390_cpu_virt_mem_handle_exc(cpu, ra);
+            return;
+        }
     }
     if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid) ||
         !ioinst_schib_valid(&schib)) {
@@ -186,9 +190,13 @@  void ioinst_handle_ssch(S390CPU *cpu, uint64_t reg1, uint32_t ipb, uintptr_t ra)
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
     }
-    if (s390_cpu_virt_mem_read(cpu, addr, ar, &orig_orb, sizeof(orb))) {
-        s390_cpu_virt_mem_handle_exc(cpu, ra);
-        return;
+    if (env->pv) {
+        s390_cpu_pv_mem_read(cpu, addr, &orig_orb, sizeof(orb));
+    } else {
+        if (s390_cpu_virt_mem_read(cpu, addr, ar, &orig_orb, sizeof(orb))) {
+            s390_cpu_virt_mem_handle_exc(cpu, ra);
+            return;
+        }
     }
     copy_orb_from_guest(&orb, &orig_orb);
     if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid) ||
@@ -222,14 +230,19 @@  void ioinst_handle_stcrw(S390CPU *cpu, uint32_t ipb, uintptr_t ra)
     cc = css_do_stcrw(&crw);
     /* 0 - crw stored, 1 - zeroes stored */
 
-    if (s390_cpu_virt_mem_write(cpu, addr, ar, &crw, sizeof(crw)) == 0) {
+    if (env->pv) {
+        s390_cpu_pv_mem_write(cpu, addr, &crw, sizeof(crw));
         setcc(cpu, cc);
     } else {
-        if (cc == 0) {
-            /* Write failed: requeue CRW since STCRW is suppressing */
-            css_undo_stcrw(&crw);
+        if (s390_cpu_virt_mem_write(cpu, addr, ar, &crw, sizeof(crw)) == 0) {
+            setcc(cpu, cc);
+        } else {
+            if (cc == 0) {
+                /* Write failed: requeue CRW since STCRW is suppressing */
+                css_undo_stcrw(&crw);
+            }
+            s390_cpu_virt_mem_handle_exc(cpu, ra);
         }
-        s390_cpu_virt_mem_handle_exc(cpu, ra);
     }
 }
 
@@ -251,6 +264,9 @@  void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb,
     }
 
     if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
+        if (env->pv) {
+            return;
+        }
         /*
          * As operand exceptions have a lower priority than access exceptions,
          * we check whether the memory area is writeable (injecting the
@@ -283,14 +299,19 @@  void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb,
         }
     }
     if (cc != 3) {
-        if (s390_cpu_virt_mem_write(cpu, addr, ar, &schib,
-                                    sizeof(schib)) != 0) {
-            s390_cpu_virt_mem_handle_exc(cpu, ra);
-            return;
+        if (env->pv) {
+            s390_cpu_pv_mem_write(cpu, addr, &schib, sizeof(schib));
+        } else {
+            if (s390_cpu_virt_mem_write(cpu, addr, ar, &schib,
+                                        sizeof(schib)) != 0) {
+                s390_cpu_virt_mem_handle_exc(cpu, ra);
+                return;
+            }
         }
     } else {
         /* Access exceptions have a higher priority than cc3 */
-        if (s390_cpu_virt_mem_check_write(cpu, addr, ar, sizeof(schib)) != 0) {
+        if (!env->pv &&
+            s390_cpu_virt_mem_check_write(cpu, addr, ar, sizeof(schib)) != 0) {
             s390_cpu_virt_mem_handle_exc(cpu, ra);
             return;
         }
@@ -327,15 +348,20 @@  int ioinst_handle_tsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb, uintptr_t ra)
     }
     /* 0 - status pending, 1 - not status pending, 3 - not operational */
     if (cc != 3) {
-        if (s390_cpu_virt_mem_write(cpu, addr, ar, &irb, irb_len) != 0) {
-            s390_cpu_virt_mem_handle_exc(cpu, ra);
-            return -EFAULT;
+        if (env->pv) {
+            s390_cpu_pv_mem_write(cpu, addr, &irb, irb_len);
+        } else {
+            if (s390_cpu_virt_mem_write(cpu, addr, ar, &irb, irb_len) != 0) {
+                s390_cpu_virt_mem_handle_exc(cpu, ra);
+                return -EFAULT;
+            }
         }
         css_do_tsch_update_subch(sch);
     } else {
         irb_len = sizeof(irb) - sizeof(irb.emw);
         /* Access exceptions have a higher priority than cc3 */
-        if (s390_cpu_virt_mem_check_write(cpu, addr, ar, irb_len) != 0) {
+        if (!env->pv &&
+            s390_cpu_virt_mem_check_write(cpu, addr, ar, irb_len) != 0) {
             s390_cpu_virt_mem_handle_exc(cpu, ra);
             return -EFAULT;
         }
@@ -633,9 +659,13 @@  void ioinst_handle_chsc(S390CPU *cpu, uint32_t ipb, uintptr_t ra)
      * present CHSC sub-handlers ... if we ever need more, we should take
      * care of req->len here first.
      */
-    if (s390_cpu_virt_mem_read(cpu, addr, reg, buf, sizeof(ChscReq))) {
-        s390_cpu_virt_mem_handle_exc(cpu, ra);
-        return;
+    if (env->pv) {
+        s390_cpu_pv_mem_read(cpu, addr, buf, sizeof(ChscReq));
+    } else {
+        if (s390_cpu_virt_mem_read(cpu, addr, reg, buf, sizeof(ChscReq))) {
+            s390_cpu_virt_mem_handle_exc(cpu, ra);
+            return;
+        }
     }
     req = (ChscReq *)buf;
     len = be16_to_cpu(req->len);
@@ -666,11 +696,16 @@  void ioinst_handle_chsc(S390CPU *cpu, uint32_t ipb, uintptr_t ra)
         break;
     }
 
-    if (!s390_cpu_virt_mem_write(cpu, addr + len, reg, res,
-                                 be16_to_cpu(res->len))) {
+    if (env->pv) {
+        s390_cpu_pv_mem_write(cpu, addr + len, res, be16_to_cpu(res->len));
         setcc(cpu, 0);    /* Command execution complete */
     } else {
-        s390_cpu_virt_mem_handle_exc(cpu, ra);
+        if (!s390_cpu_virt_mem_write(cpu, addr + len, reg, res,
+                                     be16_to_cpu(res->len))) {
+            setcc(cpu, 0);    /* Command execution complete */
+        } else {
+            s390_cpu_virt_mem_handle_exc(cpu, ra);
+        }
     }
 }