[Qemu-devel] [PATCH 07/22] target-ppc: Rework storage of VPA registration state

[Alexander Graf]

From: David Gibson <address@hidden>

With PAPR guests, hypercalls allow registration of the Virtual Processor
Area (VPA), SLB shadow and dispatch trace log (DTL), each of which allow
for certain communication between the guest and hypervisor.  Currently, we
store the addresses of the three areas and the size of the dtl in
CPUPPCState.

The SLB shadow and DTL are variable sized, with the size being retrieved
from within the registered memory area at the hypercall time.  This size
can later be overwritten with other information, however, so we need to
save the size as of registration time.  We already do this for the DTL,
but not for the SLB shadow, so this patch fixes that.

In addition, we change the storage of the VPA information to use fixed
size integer types which will make life easier for syncing this data with
KVM, which we will need in future.

Signed-off-by: David Gibson <address@hidden>
Signed-off-by: Alexander Graf <address@hidden>
---
 hw/spapr_hcall.c            |   26 ++++++++++++++------------
 target-ppc/cpu.h            |    7 +++----
 target-ppc/translate_init.c |    7 ++++---
 3 files changed, 21 insertions(+), 19 deletions(-)

diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
index 762493a..621dabd 100644
--- a/hw/spapr_hcall.c
+++ b/hw/spapr_hcall.c
@@ -366,26 +366,26 @@ static target_ulong register_vpa(CPUPPCState *env, 
target_ulong vpa)
         return H_PARAMETER;
     }
 
-    env->vpa = vpa;
+    env->vpa_addr = vpa;
 
-    tmp = ldub_phys(env->vpa + VPA_SHARED_PROC_OFFSET);
+    tmp = ldub_phys(env->vpa_addr + VPA_SHARED_PROC_OFFSET);
     tmp |= VPA_SHARED_PROC_VAL;
-    stb_phys(env->vpa + VPA_SHARED_PROC_OFFSET, tmp);
+    stb_phys(env->vpa_addr + VPA_SHARED_PROC_OFFSET, tmp);
 
     return H_SUCCESS;
 }
 
 static target_ulong deregister_vpa(CPUPPCState *env, target_ulong vpa)
 {
-    if (env->slb_shadow) {
+    if (env->slb_shadow_addr) {
         return H_RESOURCE;
     }
 
-    if (env->dispatch_trace_log) {
+    if (env->dtl_addr) {
         return H_RESOURCE;
     }
 
-    env->vpa = 0;
+    env->vpa_addr = 0;
     return H_SUCCESS;
 }
 
@@ -407,18 +407,20 @@ static target_ulong register_slb_shadow(CPUPPCState *env, 
target_ulong addr)
         return H_PARAMETER;
     }
 
-    if (!env->vpa) {
+    if (!env->vpa_addr) {
         return H_RESOURCE;
     }
 
-    env->slb_shadow = addr;
+    env->slb_shadow_addr = addr;
+    env->slb_shadow_size = size;
 
     return H_SUCCESS;
 }
 
 static target_ulong deregister_slb_shadow(CPUPPCState *env, target_ulong addr)
 {
-    env->slb_shadow = 0;
+    env->slb_shadow_addr = 0;
+    env->slb_shadow_size = 0;
     return H_SUCCESS;
 }
 
@@ -437,11 +439,11 @@ static target_ulong register_dtl(CPUPPCState *env, 
target_ulong addr)
         return H_PARAMETER;
     }
 
-    if (!env->vpa) {
+    if (!env->vpa_addr) {
         return H_RESOURCE;
     }
 
-    env->dispatch_trace_log = addr;
+    env->dtl_addr = addr;
     env->dtl_size = size;
 
     return H_SUCCESS;
@@ -449,7 +451,7 @@ static target_ulong register_dtl(CPUPPCState *env, 
target_ulong addr)
 
 static target_ulong deregister_dtl(CPUPPCState *env, target_ulong addr)
 {
-    env->dispatch_trace_log = 0;
+    env->dtl_addr = 0;
     env->dtl_size = 0;
 
     return H_SUCCESS;
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 3f114c9..286f42a 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1045,10 +1045,9 @@ struct CPUPPCState {
 #endif
 
 #if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
-    hwaddr vpa;
-    hwaddr slb_shadow;
-    hwaddr dispatch_trace_log;
-    uint32_t dtl_size;
+    hwaddr vpa_addr;
+    hwaddr slb_shadow_addr, slb_shadow_size;
+    hwaddr dtl_addr, dtl_size;
 #endif /* TARGET_PPC64 */
 
     int error_code;
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index ad54985..e63627c 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -10425,9 +10425,10 @@ static void ppc_cpu_reset(CPUState *s)
     env->error_code = 0;
 
 #if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
-    env->vpa = 0;
-    env->slb_shadow = 0;
-    env->dispatch_trace_log = 0;
+    env->vpa_addr = 0;
+    env->slb_shadow_addr = 0;
+    env->slb_shadow_size = 0;
+    env->dtl_addr = 0;
     env->dtl_size = 0;
 #endif /* TARGET_PPC64 */
 
-- 
1.6.0.2