[PATCH v4 06/14] acpi/ghes: create an ancillary acpi_ghes_get_state() function

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

Instead of having a function to check if ACPI is enabled
(acpi_ghes_present), change its logic to be more generic,
returing a pointed to AcpiGhesState.

Such change allows cleanup the ghes GED state code, avoiding
to read it multiple times, and simplifying the code.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by:  Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/ghes-stub.c    |  7 ++++---
 hw/acpi/ghes.c         | 38 ++++++++++----------------------------
 include/hw/acpi/ghes.h | 14 ++++++++------
 target/arm/kvm.c       |  7 +++++--
 4 files changed, 27 insertions(+), 39 deletions(-)

diff --git a/hw/acpi/ghes-stub.c b/hw/acpi/ghes-stub.c
index 7cec1812dad9..40f660c246fe 100644
--- a/hw/acpi/ghes-stub.c
+++ b/hw/acpi/ghes-stub.c
@@ -11,12 +11,13 @@
 #include "qemu/osdep.h"
 #include "hw/acpi/ghes.h"
 
-int acpi_ghes_memory_errors(uint16_t source_id, uint64_t physical_address)
+int acpi_ghes_memory_errors(AcpiGhesState *ags, uint16_t source_id,
+                            uint64_t physical_address)
 {
     return -1;
 }
 
-bool acpi_ghes_present(void)
+AcpiGhesState *acpi_ghes_get_state(void)
 {
-    return false;
+    return NULL;
 }
diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index f2d1cc7369f4..401789259f60 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -425,10 +425,6 @@ static void get_hw_error_offsets(uint64_t ghes_addr,
                                  uint64_t *cper_addr,
                                  uint64_t *read_ack_register_addr)
 {
-    if (!ghes_addr) {
-        return;
-    }
-
     /*
      * non-HEST version supports only one source, so no need to change
      * the start offset based on the source ID. Also, we can't validate
@@ -517,27 +513,16 @@ static void get_ghes_source_offsets(uint16_t source_id,
 NotifierList acpi_generic_error_notifiers =
     NOTIFIER_LIST_INITIALIZER(error_device_notifiers);
 
-void ghes_record_cper_errors(const void *cper, size_t len,
+void ghes_record_cper_errors(AcpiGhesState *ags, const void *cper, size_t len,
                              uint16_t source_id, Error **errp)
 {
     uint64_t cper_addr = 0, read_ack_register_addr = 0, read_ack_register;
-    AcpiGedState *acpi_ged_state;
-    AcpiGhesState *ags;
 
     if (len > ACPI_GHES_MAX_RAW_DATA_LENGTH) {
         error_setg(errp, "GHES CPER record is too big: %zd", len);
         return;
     }
 
-    acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
-                                                       NULL));
-    if (!acpi_ged_state) {
-        error_setg(errp, "Can't find ACPI_GED object");
-        return;
-    }
-    ags = &acpi_ged_state->ghes_state;
-
-
     if (!ags->use_hest_addr) {
         get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
                              &cper_addr, &read_ack_register_addr);
@@ -546,11 +531,6 @@ void ghes_record_cper_errors(const void *cper, size_t len,
                                 &cper_addr, &read_ack_register_addr, errp);
     }
 
-    if (!cper_addr) {
-        error_setg(errp, "can not find Generic Error Status Block");
-        return;
-    }
-
     cpu_physical_memory_read(read_ack_register_addr,
                              &read_ack_register, sizeof(read_ack_register));
 
@@ -576,7 +556,8 @@ void ghes_record_cper_errors(const void *cper, size_t len,
     notifier_list_notify(&acpi_generic_error_notifiers, NULL);
 }
 
-int acpi_ghes_memory_errors(uint16_t source_id, uint64_t physical_address)
+int acpi_ghes_memory_errors(AcpiGhesState *ags, uint16_t source_id,
+                            uint64_t physical_address)
 {
     /* Memory Error Section Type */
     const uint8_t guid[] =
@@ -602,7 +583,7 @@ int acpi_ghes_memory_errors(uint16_t source_id, uint64_t physical_address)
     acpi_ghes_build_append_mem_cper(block, physical_address);
 
     /* Report the error */
-    ghes_record_cper_errors(block->data, block->len, source_id, &errp);
+    ghes_record_cper_errors(ags, block->data, block->len, source_id, &errp);
 
     g_array_free(block, true);
 
@@ -614,7 +595,7 @@ int acpi_ghes_memory_errors(uint16_t source_id, uint64_t physical_address)
     return 0;
 }
 
-bool acpi_ghes_present(void)
+AcpiGhesState *acpi_ghes_get_state(void)
 {
     AcpiGedState *acpi_ged_state;
     AcpiGhesState *ags;
@@ -623,11 +604,12 @@ bool acpi_ghes_present(void)
                                                        NULL));
 
     if (!acpi_ged_state) {
-        return false;
+        return NULL;
     }
     ags = &acpi_ged_state->ghes_state;
-    if (!ags->hw_error_le && !ags->hest_addr_le)
-        return false;
 
-    return true;
+    if (!ags->hw_error_le && !ags->hest_addr_le) {
+        return NULL;
+    }
+    return ags;
 }
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 219aa7ab4fe0..276f9dc076d9 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -99,15 +99,17 @@ void acpi_build_hest(AcpiGhesState *ags, GArray *table_data,
                      const char *oem_id, const char *oem_table_id);
 void acpi_ghes_add_fw_cfg(AcpiGhesState *vms, FWCfgState *s,
                           GArray *hardware_errors);
-int acpi_ghes_memory_errors(uint16_t source_id, uint64_t error_physical_addr);
-void ghes_record_cper_errors(const void *cper, size_t len,
+int acpi_ghes_memory_errors(AcpiGhesState *ags, uint16_t source_id,
+                            uint64_t error_physical_addr);
+void ghes_record_cper_errors(AcpiGhesState *ags, const void *cper, size_t len,
                              uint16_t source_id, Error **errp);
 
 /**
- * acpi_ghes_present: Report whether ACPI GHES table is present
+ * acpi_ghes_get_state: Get a pointer for ACPI ghes state
  *
- * Returns: true if the system has an ACPI GHES table and it is
- * safe to call acpi_ghes_memory_errors() to record a memory error.
+ * Returns: a pointer to ghes state if the system has an ACPI GHES table,
+ * it is enabled and it is safe to call acpi_ghes_memory_errors() to record
+ * a memory error. Returns false, otherwise.
  */
-bool acpi_ghes_present(void);
+AcpiGhesState *acpi_ghes_get_state(void);
 #endif
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index da30bdbb2349..80ca7779797b 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -2366,10 +2366,12 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
 {
     ram_addr_t ram_addr;
     hwaddr paddr;
+    AcpiGhesState *ags;
 
     assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO);
 
-    if (acpi_ghes_present() && addr) {
+    ags = acpi_ghes_get_state();
+    if (ags && addr) {
         ram_addr = qemu_ram_addr_from_host(addr);
         if (ram_addr != RAM_ADDR_INVALID &&
             kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
@@ -2387,7 +2389,8 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
              */
             if (code == BUS_MCEERR_AR) {
                 kvm_cpu_synchronize_state(c);
-                if (!acpi_ghes_memory_errors(ACPI_HEST_SRC_ID_SEA, paddr)) {
+                if (!acpi_ghes_memory_errors(ags, ACPI_HEST_SRC_ID_SEA,
+                                             paddr)) {
                     kvm_inject_arm_sea(c);
                 } else {
                     error_report("failed to record the error");
-- 
2.48.1