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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=harshpb@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1761220272496158500 Content-Type: text/plain; charset="utf-8" From: Aditya Gupta Platform (ie. QEMU) is expected to pass few device tree properties for details for fadump: * "ibm,configure-kernel-dump-sizes": Space required to store dump data for firmware provided dump sections (ie. CPU & HPTE regions) * "ibm,configure-kernel-dump-version": Versions of fadump supported Pass the above device tree nodes so that kernel can reserve sufficient space for preserving the CPU state data Signed-off-by: Aditya Gupta Reviewed-by: Sourabh Jain Tested-by: Shivang Upadhyay Link: https://lore.kernel.org/qemu-devel/20251021134823.1861675-6-adityag@l= inux.ibm.com Signed-off-by: Harsh Prateek Bora --- hw/ppc/spapr.c | 57 +++++++++++++++++++++++++++++++++++++++++++ hw/ppc/spapr_fadump.c | 6 ++--- 2 files changed, 60 insertions(+), 3 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 117da76a3d..d6cfb9acbc 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -900,6 +900,61 @@ static int spapr_dt_rng(void *fdt) return ret ? -1 : 0; } =20 +static void spapr_dt_rtas_fadump(SpaprMachineState *spapr, void *fdt, int = rtas) +{ + MachineState *ms =3D MACHINE(spapr); + MachineClass *mc =3D MACHINE_GET_CLASS(ms); + + uint32_t max_possible_cpus =3D mc->possible_cpu_arch_ids(ms)->len; + uint64_t fadump_cpu_state_size =3D 0; + uint16_t fadump_versions[2] =3D { + FADUMP_VERSION /* min supported version */, + FADUMP_VERSION /* max supported version */ + }; + uint32_t fadump_rgn_sizes[2][3] =3D { + { + cpu_to_be32(FADUMP_CPU_STATE_DATA), + 0, 0 /* Calculated later */ + }, + { + cpu_to_be32(FADUMP_HPTE_REGION), + 0, 0 /* HPTE region not implemented */ + } + }; + + /* + * CPU State Data contains multiple fields such as header, num_cpus and + * register entries + * + * Calculate the maximum CPU State Data size, according to maximum + * possible CPUs the QEMU VM can have + * + * This calculation must match the 'cpu_state_len' calculation done in + * 'populate_cpu_state_data' in spapr_fadump.c + */ + fadump_cpu_state_size +=3D sizeof(struct FadumpRegSaveAreaHeader); + fadump_cpu_state_size +=3D 0xc; /* padding as in = PAPR */ + fadump_cpu_state_size +=3D sizeof(uint32_t); /* num_cpus */ + fadump_cpu_state_size +=3D max_possible_cpus * /* reg entries */ + FADUMP_PER_CPU_REG_ENTRIES * + sizeof(struct FadumpRegEntry); + + /* Set maximum size for CPU state data region */ + assert(fadump_rgn_sizes[0][0] =3D=3D cpu_to_be32(FADUMP_CPU_STATE_DATA= )); + + /* Upper 32 bits of size, usually 0 */ + fadump_rgn_sizes[0][1] =3D cpu_to_be32(fadump_cpu_state_size >> 32); + + /* Lower 32 bits of size */ + fadump_rgn_sizes[0][2] =3D cpu_to_be32(fadump_cpu_state_size & 0xfffff= fff); + + /* Add device tree properties required from platform for fadump */ + _FDT((fdt_setprop(fdt, rtas, "ibm,configure-kernel-dump-version", + fadump_versions, sizeof(fadump_versions)))); + _FDT((fdt_setprop(fdt, rtas, "ibm,configure-kernel-dump-sizes", + fadump_rgn_sizes, sizeof(fadump_rgn_sizes)))); +} + static void spapr_dt_rtas(SpaprMachineState *spapr, void *fdt) { MachineState *ms =3D MACHINE(spapr); @@ -1015,6 +1070,8 @@ static void spapr_dt_rtas(SpaprMachineState *spapr, v= oid *fdt) _FDT(fdt_setprop(fdt, rtas, "ibm,lrdr-capacity", lrdr_capacity, sizeof(lrdr_capacity))); =20 + spapr_dt_rtas_fadump(spapr, fdt, rtas); + spapr_dt_rtas_tokens(fdt, rtas); } =20 diff --git a/hw/ppc/spapr_fadump.c b/hw/ppc/spapr_fadump.c index fdd4929148..fa3aeac94c 100644 --- a/hw/ppc/spapr_fadump.c +++ b/hw/ppc/spapr_fadump.c @@ -492,7 +492,7 @@ static void *get_cpu_state_data(uint64_t *cpu_state_len) *cpu_state_len =3D 0; *cpu_state_len +=3D sizeof(reg_save_hdr); /* reg save header */ *cpu_state_len +=3D 0xc; /* padding as in PAPR */ - *cpu_state_len +=3D sizeof(__be32); /* num_cpus */ + *cpu_state_len +=3D sizeof(num_cpus); /* num_cpus */ *cpu_state_len +=3D reg_entries_size; /* reg entries */ =20 cpu_state_buffer =3D g_malloc(*cpu_state_len); @@ -503,8 +503,8 @@ static void *get_cpu_state_data(uint64_t *cpu_state_len) =20 /* Write num_cpus */ num_cpus =3D cpu_to_be32(num_cpus); - memcpy(cpu_state_buffer + offset, &num_cpus, sizeof(__be32)); - offset +=3D sizeof(__be32); + memcpy(cpu_state_buffer + offset, &num_cpus, sizeof(num_cpus)); + offset +=3D sizeof(num_cpus); =20 /* Write the register entries */ memcpy(cpu_state_buffer + offset, reg_entries, reg_entries_size); --=20 2.43.5