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Tue, 21 Oct 2025 13:48:28 +0000 (GMT) From: Aditya Gupta To: Cc: , Nicholas Piggin , Daniel Henrique Barboza , Harsh Prateek Bora , Sourabh Jain , Mahesh J Salgaonkar , Hari Bathini , Chinmay Rath , Thomas Huth , Shivang Upadhyay , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v5 1/8] hw/ppc: Implement fadump register command Date: Tue, 21 Oct 2025 19:18:11 +0530 Message-ID: <20251021134823.1861675-2-adityag@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251021134823.1861675-1-adityag@linux.ibm.com> References: <20251021134823.1861675-1-adityag@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=EJELElZC c=1 sm=1 tr=0 ts=68f78f35 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=y74iKLHVKnUro7i0tboA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDE4MDAyMiBTYWx0ZWRfX38ruD3XF26H2 8WjegChBJyboLyE8nca2kaMbuqOL9xCygzPwoykXVbYTQazooxhxkbRstY3jeVcOkzoMPOvjKwG dC8BgCHVmX3CYCzqstcwSRw9e4hlGsGlRt82sfcHMqj64vsIW2g7rzTrUSXc/1nB9FkxFgwn8mR jNN7gqOVuOqWLRkMWFI/QBoANgMkor2W/wRhcb2pgf8tRKJJJEMdNO5gWPeT3pqiB9uxskxyUGp fYGoN0EOmoJ1OA6bE6rta3ssSCSNomYaUJsnfwHOA7lNGLhHyV4N3KIvZs2c6x7l22B2l7e+mc9 TcGCKOH7DrD3r9+4Vi1kcEdgYnpu1fjlxGEAbuj8c7cE6PGUXnUJo70FXS3SF/9/kfk4J9qn70J QPY2C69aeliZJj54Vq2meoV38+AXSA== X-Proofpoint-GUID: oGQkzLuSfWSThLzTlFgLaqV4xObJNOqf X-Proofpoint-ORIG-GUID: gZuaniQAY1G8p6_gsAppRv9fVJa65rDv X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-21_02,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 spamscore=0 malwarescore=0 phishscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510180022 Received-SPF: pass client-ip=148.163.156.1; envelope-from=adityag@linux.ibm.com; helo=mx0a-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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add skeleton to handle "ibm,configure-kernel-dump" rtas call in QEMU, including register, unregister and invalidate commands. The register just verifies the structure of the fadump memory structure passed by kernel, and set fadump_registered in spapr state to true. Verify basic details mandated by the PAPR, such as number of inputs/output, and add handling for the three fadump commands: regiser/unregister/invalidate. The checks are based on the table in following requirement in PAPR v2.13: "R1–7.3.30–1. For the Configure Platform Assisted Kernel Dump option ..." Relevant section for the register command in PAPR is: Section 7.3.30: "ibm,configure-kernel-dump RTAS call" (PAPR v2.13) Note: Any modifications made by the kernel to the fadump memory structure after the 'ibm,configure-kernel-dump' RTAS call returns will not be reflected in QEMU, as QEMU retains the fadump memory structure that was provided during fadump registration. The kernel must unregister and re-register fadump to apply any changes to the fadump memory structure. Signed-off-by: Aditya Gupta --- hw/ppc/meson.build | 1 + hw/ppc/spapr_fadump.c | 123 ++++++++++++++++++++++++++++++++++ hw/ppc/spapr_rtas.c | 71 ++++++++++++++++++++ include/hw/ppc/spapr.h | 11 ++- include/hw/ppc/spapr_fadump.h | 69 +++++++++++++++++++ 5 files changed, 274 insertions(+), 1 deletion(-) create mode 100644 hw/ppc/spapr_fadump.c create mode 100644 include/hw/ppc/spapr_fadump.h diff --git a/hw/ppc/meson.build b/hw/ppc/meson.build index 170b90ae7d05..6b7c1f4f49fb 100644 --- a/hw/ppc/meson.build +++ b/hw/ppc/meson.build @@ -26,6 +26,7 @@ ppc_ss.add(when: 'CONFIG_PSERIES', if_true: files( 'spapr_nvdimm.c', 'spapr_rtas_ddw.c', 'spapr_numa.c', + 'spapr_fadump.c', 'pef.c', )) ppc_ss.add(when: ['CONFIG_PSERIES', 'CONFIG_TCG'], if_true: files( diff --git a/hw/ppc/spapr_fadump.c b/hw/ppc/spapr_fadump.c new file mode 100644 index 000000000000..2c9f024c2d8c --- /dev/null +++ b/hw/ppc/spapr_fadump.c @@ -0,0 +1,123 @@ +/* + * Firmware Assisted Dump in PSeries + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "hw/ppc/spapr.h" + +/* + * Handle the "FADUMP_CMD_REGISTER" command in 'ibm,configure-kernel-dump' + * + * Note: Any changes made by the kernel to the fadump memory struct won't + * reflect in QEMU after the 'ibm,configure-kernel-dump' RTAS call has returned, + * as we store the passed fadump memory structure passed during fadump + * registration. + * Kernel has to invalidate & re-register fadump, if it intends to make any + * changes to the fadump memory structure + * + * Returns: + * * RTAS_OUT_SUCCESS: On successful registration + * * RTAS_OUT_PARAM_ERROR: If parameters are not correct, eg. too many + * sections, invalid memory addresses that we are + * unable to read, etc + * * RTAS_OUT_DUMP_ALREADY_REGISTERED: Dump already registered + * * RTAS_OUT_HW_ERROR: Misc issue such as memory access failures + */ +uint32_t do_fadump_register(SpaprMachineState *spapr, target_ulong args) +{ + FadumpSectionHeader header; + FadumpSection regions[FADUMP_MAX_SECTIONS] = {0}; + target_ulong fdm_addr = rtas_ld(args, 1); + target_ulong fdm_size = rtas_ld(args, 2); + AddressSpace *default_as = &address_space_memory; + MemTxResult io_result; + MemTxAttrs attrs; + uint64_t next_section_addr; + uint16_t dump_num_sections; + + /* Mark the memory transaction as privileged memory access */ + attrs.user = 0; + attrs.memory = 1; + + if (spapr->fadump_registered) { + /* FADump already registered */ + return RTAS_OUT_DUMP_ALREADY_REGISTERED; + } + + if (spapr->fadump_dump_active) { + return RTAS_OUT_DUMP_ACTIVE; + } + + if (fdm_size < sizeof(FadumpSectionHeader)) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Header size is invalid: " TARGET_FMT_lu "\n", fdm_size); + return RTAS_OUT_PARAM_ERROR; + } + + /* Ensure fdm_addr points to a valid RMR-memory/RMA-memory buffer */ + if ((fdm_addr <= 0) || ((fdm_addr + fdm_size) > spapr->rma_size)) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Invalid fdm address: " TARGET_FMT_lu "\n", fdm_addr); + return RTAS_OUT_PARAM_ERROR; + } + + /* Try to read the passed fadump header */ + io_result = address_space_read(default_as, fdm_addr, attrs, + &header, sizeof(header)); + if (io_result != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Unable to read fdm: " TARGET_FMT_lu "\n", fdm_addr); + + return RTAS_OUT_HW_ERROR; + } + + /* Verify that we understand the fadump header version */ + if (header.dump_format_version != cpu_to_be32(FADUMP_VERSION)) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Unknown fadump header version: 0x%x\n", + header.dump_format_version); + return RTAS_OUT_PARAM_ERROR; + } + + /* Reset dump status flags */ + header.dump_status_flag = 0; + + dump_num_sections = be16_to_cpu(header.dump_num_sections); + + if (dump_num_sections > FADUMP_MAX_SECTIONS) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Too many sections: %d sections\n", dump_num_sections); + return RTAS_OUT_PARAM_ERROR; + } + + next_section_addr = + fdm_addr + + be32_to_cpu(header.offset_first_dump_section); + + for (int i = 0; i < dump_num_sections; ++i) { + /* Read the fadump section from memory */ + io_result = address_space_read(default_as, next_section_addr, attrs, + ®ions[i], sizeof(regions[i])); + if (io_result != MEMTX_OK) { + qemu_log_mask(LOG_UNIMP, + "FADump: Unable to read fadump %dth section\n", i); + return RTAS_OUT_PARAM_ERROR; + } + + next_section_addr += sizeof(regions[i]); + } + + spapr->fadump_registered = true; + spapr->fadump_dump_active = false; + + /* Store the registered fadump memory struct */ + spapr->registered_fdm.header = header; + for (int i = 0; i < dump_num_sections; ++i) { + spapr->registered_fdm.rgn[i] = regions[i]; + } + + return RTAS_OUT_SUCCESS; +} diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 143bc8c37947..6042fc72e57a 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -344,6 +344,73 @@ static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, rtas_st(rets, 0, ret); } +/* Papr Section 7.4.9 ibm,configure-kernel-dump RTAS call */ +static void rtas_configure_kernel_dump(PowerPCCPU *cpu, + SpaprMachineState *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + target_ulong cmd = rtas_ld(args, 0); + uint32_t ret_val; + + /* Number of outputs has to be 1 */ + if (nret != 1) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: ibm,configure-kernel-dump called with nret != 1.\n"); + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + /* Number of inputs has to be 3 */ + if (nargs != 3) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: ibm,configure-kernel-dump called with nargs != 3.\n"); + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + switch (cmd) { + case FADUMP_CMD_REGISTER: + ret_val = do_fadump_register(spapr, args); + if (ret_val != RTAS_OUT_SUCCESS) { + rtas_st(rets, 0, ret_val); + return; + } + break; + case FADUMP_CMD_UNREGISTER: + if (spapr->fadump_dump_active) { + rtas_st(rets, 0, RTAS_OUT_DUMP_ACTIVE); + return; + } + + spapr->fadump_registered = false; + spapr->fadump_dump_active = false; + memset(&spapr->registered_fdm, 0, sizeof(spapr->registered_fdm)); + break; + case FADUMP_CMD_INVALIDATE: + if (!spapr->fadump_dump_active) { + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Nothing to invalidate, no dump active\n"); + + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + } + + spapr->fadump_registered = false; + spapr->fadump_dump_active = false; + memset(&spapr->registered_fdm, 0, sizeof(spapr->registered_fdm)); + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "FADump: Unknown command: " TARGET_FMT_lu "\n", cmd); + + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + rtas_st(rets, 0, RTAS_OUT_SUCCESS); +} + static void rtas_ibm_os_term(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, @@ -659,6 +726,10 @@ static void core_rtas_register_types(void) spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock", rtas_ibm_nmi_interlock); + /* Register fadump rtas call */ + spapr_rtas_register(RTAS_CONFIGURE_KERNEL_DUMP, "ibm,configure-kernel-dump", + rtas_configure_kernel_dump); + qtest_set_command_cb(spapr_qtest_callback); } diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 39bd5bd5ed31..4c1636497e30 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -13,6 +13,7 @@ #include "hw/ppc/xics.h" /* For ICSState */ #include "hw/ppc/spapr_tpm_proxy.h" #include "hw/ppc/spapr_nested.h" /* For SpaprMachineStateNested */ +#include "hw/ppc/spapr_fadump.h" /* For FadumpMemStruct */ struct SpaprVioBus; struct SpaprPhbState; @@ -283,6 +284,11 @@ struct SpaprMachineState { Error *fwnmi_migration_blocker; SpaprWatchdog wds[WDT_MAX_WATCHDOGS]; + + /* Fadump State */ + bool fadump_registered; + bool fadump_dump_active; + FadumpMemStruct registered_fdm; }; #define H_SUCCESS 0 @@ -708,6 +714,8 @@ void push_sregs_to_kvm_pr(SpaprMachineState *spapr); #define RTAS_OUT_PARAM_ERROR -3 #define RTAS_OUT_NOT_SUPPORTED -3 #define RTAS_OUT_NO_SUCH_INDICATOR -3 +#define RTAS_OUT_DUMP_ALREADY_REGISTERED -9 +#define RTAS_OUT_DUMP_ACTIVE -10 #define RTAS_OUT_NOT_AUTHORIZED -9002 #define RTAS_OUT_SYSPARM_PARAM_ERROR -9999 @@ -770,8 +778,9 @@ void push_sregs_to_kvm_pr(SpaprMachineState *spapr); #define RTAS_IBM_SUSPEND_ME (RTAS_TOKEN_BASE + 0x2A) #define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2B) #define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2C) +#define RTAS_CONFIGURE_KERNEL_DUMP (RTAS_TOKEN_BASE + 0x2D) -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2D) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2E) /* RTAS ibm,get-system-parameter token values */ #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20 diff --git a/include/hw/ppc/spapr_fadump.h b/include/hw/ppc/spapr_fadump.h new file mode 100644 index 000000000000..f64f33920496 --- /dev/null +++ b/include/hw/ppc/spapr_fadump.h @@ -0,0 +1,69 @@ +/* + * Firmware Assisted Dump in PSeries + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#ifndef PPC_SPAPR_FADUMP_H +#define PPC_SPAPR_FADUMP_H + +#include "qemu/osdep.h" +#include "cpu.h" + +/* Fadump commands */ +#define FADUMP_CMD_REGISTER 1 +#define FADUMP_CMD_UNREGISTER 2 +#define FADUMP_CMD_INVALIDATE 3 + +#define FADUMP_VERSION 1 + +/* + * The Firmware Assisted Dump Memory structure supports a maximum of 10 sections + * in the dump memory structure. Presently, three sections are used for + * CPU state data, HPTE & Parameters area, while the remaining seven sections + * can be used for boot memory regions. + */ +#define FADUMP_MAX_SECTIONS 10 + +typedef struct FadumpSection FadumpSection; +typedef struct FadumpSectionHeader FadumpSectionHeader; +typedef struct FadumpMemStruct FadumpMemStruct; + +struct SpaprMachineState; + +/* Kernel Dump section info */ +/* All fields are in big-endian */ +struct FadumpSection { + uint32_t request_flag; + uint16_t source_data_type; + uint16_t error_flags; + uint64_t source_address; + uint64_t source_len; + uint64_t bytes_dumped; + uint64_t destination_address; +}; + +/* ibm,configure-kernel-dump header. */ +struct FadumpSectionHeader { + uint32_t dump_format_version; + uint16_t dump_num_sections; + uint16_t dump_status_flag; + uint32_t offset_first_dump_section; + + /* Fields for disk dump option. */ + uint32_t dd_block_size; + uint64_t dd_block_offset; + uint64_t dd_num_blocks; + uint32_t dd_offset_disk_path; + + /* Maximum time allowed to prevent an automatic dump-reboot. */ + uint32_t max_time_auto; +}; + +/* Note: All the data in these structures is in big-endian */ +struct FadumpMemStruct { + FadumpSectionHeader header; + FadumpSection rgn[FADUMP_MAX_SECTIONS]; +}; + +uint32_t do_fadump_register(struct SpaprMachineState *, target_ulong); +#endif /* PPC_SPAPR_FADUMP_H */ -- 2.51.0