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

Igor Mammedov
2025-02-26T15:27:10Z

On Fri, 21 Feb 2025 15:35:15 +0100
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

> 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
^^^^^^^^^^^^^ can't link 'it' with anything, I'd drop this

> + * a memory error. Returns false, otherwise.
^^^ NULL ??

> */
> -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");