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Message-ID: <20250130144439.161165d4@foz.lan>
Date: Thu, 30 Jan 2025 14:44:39 +0100
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Igor Mammedov <imammedo@...hat.com>
Cc: "Michael S . Tsirkin" <mst@...hat.com>, Jonathan Cameron
<Jonathan.Cameron@...wei.com>, Shiju Jose <shiju.jose@...wei.com>,
qemu-arm@...gnu.org, qemu-devel@...gnu.org, Ani Sinha
<anisinha@...hat.com>, Dongjiu Geng <gengdongjiu1@...il.com>, Paolo Bonzini
<pbonzini@...hat.com>, Peter Maydell <peter.maydell@...aro.org>,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/13] acpi/ghes: Cleanup the code which gets ghes
ged state
Em Wed, 29 Jan 2025 15:55:30 +0100
Igor Mammedov <imammedo@...hat.com> escreveu:
> On Wed, 29 Jan 2025 09:04:14 +0100
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
>
> > Move the check logic into a common function and simplify the
> > code which checks if GHES is enabled and was properly setup.
> >
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>
> with nits fixed:
> Reviewed-by: Igor Mammedov <imammedo@...hat.com>
>
> > ---
> > hw/acpi/ghes-stub.c | 7 ++++---
> > hw/acpi/ghes.c | 43 ++++++++++++------------------------------
> > include/hw/acpi/ghes.h | 15 ++++++++-------
> > target/arm/kvm.c | 8 ++++++--
> > 4 files changed, 30 insertions(+), 43 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 38ff95273706..849abfa12187 100644
> > --- a/hw/acpi/ghes.c
> > +++ b/hw/acpi/ghes.c
> > @@ -407,18 +407,12 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
> > fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
> > NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
> > }
> > -
> > - ags->present = true;
> > }
> >
> > 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
> > @@ -447,9 +441,6 @@ static void get_ghes_source_offsets(uint16_t source_id,
> > uint64_t err_source_entry, error_block_addr;
> > uint32_t num_sources, i;
> >
> > - if (!hest_entry_addr) {
> > - return;
> > - }
> >
> > cpu_physical_memory_read(hest_entry_addr, &num_sources,
> > sizeof(num_sources));
> > @@ -515,27 +506,17 @@ 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->hest_addr_le) {
> > + if (!ags->use_hest_addr) {
> > get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
> > &cper_addr, &read_ack_register_addr);
> > } else {
> > @@ -543,11 +524,6 @@ 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));
> >
> > @@ -573,7 +549,8 @@ 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[] =
> > @@ -599,7 +576,7 @@ 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);
> >
> > @@ -611,7 +588,7 @@ 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;
> > @@ -620,8 +597,12 @@ bool acpi_ghes_present(void)
> > NULL));
> >
> > if (!acpi_ged_state) {
> > - return false;
> > + return NULL;
> > }
> > ags = &acpi_ged_state->ghes_state;
> > - return ags->present;
> > +
> > + if (!ags->hw_error_le && !ags->hest_addr_le) {
>
> should we add a warning here?
> (consider case where firmware hasn't managed to update pointers for some reason)
I don't think so, as this will also return NULL if ras=off. See, the
original goal of acpi_ghes_present(void) were to avoid needing to check
if ras is enabled outside GHES code, like here at target/arm/kvm.c:
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);
ags = acpi_ghes_get_state();
if (ags && addr) {
...
This new logic repurposed acpi_ghes_present() as acpi_ghes_get_state(),
using it to full two situations:
1) ras=on;
2) either hw_err_addr_le or hest_addr_le exists.
Except if some serious issue takes place, (2) is actually equivalent
to check if ras is on or off.
Besides that, Error **errp is not defined yet, so we can't do this:
error_setg(errp, "HEST/GHES pointer is not available")
> > + return NULL;
> > + }
> > + return ags;
> > }
> > diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
> > index 80a0c3fcfaca..e1b66141d01c 100644
> > --- a/include/hw/acpi/ghes.h
> > +++ b/include/hw/acpi/ghes.h
> > @@ -63,7 +63,6 @@ enum AcpiGhesNotifyType {
> > typedef struct AcpiGhesState {
> > uint64_t hest_addr_le;
> > uint64_t hw_error_le;
> > - bool present; /* True if GHES is present at all on this board */
> > bool use_hest_addr; /* True if HEST address is present */
> > } AcpiGhesState;
> >
> > @@ -87,15 +86,17 @@ 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..544ff174784d 100644
> > --- a/target/arm/kvm.c
> > +++ b/target/arm/kvm.c
> > @@ -2366,10 +2366,13 @@ 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();
>
> > +
> I'd drop this newline
>
> > + 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 +2390,8 @@ 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");
>
Thanks,
Mauro
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