[Qemu-devel] [PATCH 02/15] target-ppc: Rework storage of VPA registration state

[David Gibson <david@gibson.dropbear.id.au>]

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 <david@gibson.dropbear.id.au>
---
 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 faf4404..eb2f43d 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)
-    target_phys_addr_t vpa;
-    target_phys_addr_t slb_shadow;
-    target_phys_addr_t dispatch_trace_log;
-    uint32_t dtl_size;
+    uint64_t vpa_addr;
+    uint64_t slb_shadow_addr, slb_shadow_size;
+    uint64_t 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 a972287..831b169 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 */
 
-- 
1.7.10.4