Re: [Crash-utility] [PATCH v3] vmware_guestdump: new input format

Alexey, Please add this kind of explanation in man 8 crash, because I don't know such usage of vmcore-related files from this message. ________________________________________ From: Alexey Makhalov <amakhalov(a)vmware.com&gt; Sent: Thursday, October 8, 2020 11:12 To: crash-utility(a)redhat.com; amakhalov(a)vmware.com; k-hagio-ab(a)nec.com; Hatayama, Daisuke/畑山 大輔 Subject: [PATCH v3] vmware_guestdump: new input format vmware_guestdump is extension to vmware_vmss with ability to debug debug.guest and debug.vmem files. debug.guest.gz and debug.vmem.gz can be obtained using following .vmx options from VM running in debug mode: monitor.mini-suspend_on_panic = TRUE monitor.suspend_on_triplefault = TRUE guestdump (debug.guest) is simplified version of *.vmss which does not contain full VM state, but minimal guest state, such as memory layout and CPUs state, needed for debugger. is_vmware_guestdump() and vmware_guestdump_init() functions parse guestdump header and populate vmss data structure (from vmware_vmss.c). As result, all handlers (except mempry_dump) from vmware_vmss.c can be reused. How to use: $ crash /path/to/debug_file.guest vmlinux Companion debug_file.vmem must be present in the same folder as debug_file.guest. Otherwise crash will shot a message: vmw: Open the companion vmem file: /path/to/debug_file.vmem crash: vmw: /path/to/debug_file.vmem: No such file or directory Signed-off-by: Alexey Makhalov <amakhalov(a)vmware.com&gt; --- Makefile | 7 +- defs.h | 8 ++ filesys.c | 12 +- main.c | 14 +++ memory.c | 8 +- vmware_guestdump.c | 315 +++++++++++++++++++++++++++++++++++++++++++++++++++++ vmware_vmss.c | 8 +- vmware_vmss.h | 8 ++ 8 files changed, 366 insertions(+), 14 deletions(-) create mode 100644 vmware_guestdump.c diff --git a/Makefile b/Makefile index 7455410..d185719 100644 --- a/Makefile +++ b/Makefile @@ -70,7 +70,7 @@ CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \ unwind_x86_32_64.c unwind_arm.c \ xen_hyper.c xen_hyper_command.c xen_hyper_global_data.c \ xen_hyper_dump_tables.c kvmdump.c qemu.c qemu-load.c sadump.c ipcs.c \ - ramdump.c vmware_vmss.c \ + ramdump.c vmware_vmss.c vmware_guestdump.c \ xen_dom0.c kaslr_helper.c SOURCE_FILES=${CFILES} ${GENERIC_HFILES} ${MCORE_HFILES} \ @@ -89,7 +89,7 @@ OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \ unwind_x86_32_64.o unwind_arm.o \ xen_hyper.o xen_hyper_command.o xen_hyper_global_data.o \ xen_hyper_dump_tables.o kvmdump.o qemu.o qemu-load.o sadump.o ipcs.o \ - ramdump.o vmware_vmss.o \ + ramdump.o vmware_vmss.o vmware_guestdump.o \ xen_dom0.o kaslr_helper.o MEMORY_DRIVER_FILES=memory_driver/Makefile memory_driver/crash.c memory_driver/README @@ -518,6 +518,9 @@ ramdump.o: ${GENERIC_HFILES} ${REDHAT_HFILES} ramdump.c vmware_vmss.o: ${GENERIC_HFILES} ${VMWARE_HFILES} vmware_vmss.c ${CC} -c ${CRASH_CFLAGS} vmware_vmss.c ${WARNING_OPTIONS} ${WARNING_ERROR} +vmware_guestdump.o: ${GENERIC_HFILES} ${VMWARE_HFILES} vmware_guestdump.c + ${CC} -c ${CRASH_CFLAGS} vmware_guestdump.c ${WARNING_OPTIONS} ${WARNING_ERROR} + kaslr_helper.o: ${GENERIC_HFILES} kaslr_helper.c ${CC} -c ${CRASH_CFLAGS} kaslr_helper.c ${WARNING_OPTIONS} ${WARNING_ERROR} diff --git a/defs.h b/defs.h index c899fe2..3386709 100644 --- a/defs.h +++ b/defs.h @@ -544,6 +544,7 @@ struct program_context { #define is_excluded_vmemmap() (pc->flags2 & EXCLUDED_VMEMMAP) #define MEMSRC_LOCAL (0x80000ULL) #define REDZONE (0x100000ULL) +#define VMWARE_VMSS_GUESTDUMP (0x200000ULL) char *cleanup; char *namelist_orig; char *namelist_debug_orig; @@ -6679,6 +6680,13 @@ int vmware_vmss_phys_base(ulong *phys_base); int vmware_vmss_set_phys_base(ulong); /* + * vmware_guestdump.c + */ +int is_vmware_guestdump(char *filename); +int vmware_guestdump_init(char *filename, FILE *ofp); +int vmware_guestdump_memory_dump(FILE *); + +/* * kaslr_helper.c */ int calc_kaslr_offset(ulong *, ulong *); diff --git a/filesys.c b/filesys.c index 2ec2b31..3361b6c 100644 --- a/filesys.c +++ b/filesys.c @@ -253,9 +253,15 @@ memory_source_init(void) error(FATAL, "%s: initialization failed\n", pc->dumpfile); } else if (pc->flags & VMWARE_VMSS) { - if (!vmware_vmss_init(pc->dumpfile, fp)) - error(FATAL, "%s: initialization failed\n", - pc->dumpfile); + if (pc->flags2 & VMWARE_VMSS_GUESTDUMP) { + if (!vmware_guestdump_init(pc->dumpfile, fp)) + error(FATAL, "%s: initialization failed\n", + pc->dumpfile); + } else { + if (!vmware_vmss_init(pc->dumpfile, fp)) + error(FATAL, "%s: initialization failed\n", + pc->dumpfile); + } } } } diff --git a/main.c b/main.c index 7f562e6..388ac46 100644 --- a/main.c +++ b/main.c @@ -671,6 +671,18 @@ main(int argc, char **argv) pc->readmem = read_vmware_vmss; pc->writemem = write_vmware_vmss; + } else if (is_vmware_guestdump(argv[optind])) { + if (pc->flags & MEMORY_SOURCES) { + error(INFO, + "too many dumpfile arguments\n"); + program_usage(SHORT_FORM); + } + pc->flags |= VMWARE_VMSS; + pc->flags2 |= VMWARE_VMSS_GUESTDUMP; + pc->dumpfile = argv[optind]; + pc->readmem = read_vmware_vmss; + pc->writemem = write_vmware_vmss; + } else { error(INFO, "%s: not a supported file format\n", @@ -1486,6 +1498,8 @@ dump_program_context(void) fprintf(fp, "%sMEMSRC_LOCAL", others++ ? "|" : ""); if (pc->flags2 & REDZONE) fprintf(fp, "%sREDZONE", others++ ? "|" : ""); + if (pc->flags2 & VMWARE_VMSS_GUESTDUMP) + fprintf(fp, "%sVMWARE_VMSS_GUESTDUMP", others++ ? "|" : ""); fprintf(fp, ")\n"); fprintf(fp, " namelist: %s\n", pc->namelist); diff --git a/memory.c b/memory.c index c951827..0848097 100644 --- a/memory.c +++ b/memory.c @@ -17115,8 +17115,12 @@ dumpfile_memory(int cmd) retval = kcore_memory_dump(fp); else if (pc->flags & SADUMP) retval = sadump_memory_dump(fp); - else if (pc->flags & VMWARE_VMSS) - retval = vmware_vmss_memory_dump(fp); + else if (pc->flags & VMWARE_VMSS) { + if (pc->flags2 & VMWARE_VMSS_GUESTDUMP) + retval = vmware_guestdump_memory_dump(fp); + else + retval = vmware_vmss_memory_dump(fp); + } break; case DUMPFILE_ENVIRONMENT: diff --git a/vmware_guestdump.c b/vmware_guestdump.c new file mode 100644 index 0000000..d3fac59 --- /dev/null +++ b/vmware_guestdump.c @@ -0,0 +1,315 @@ +/* + * vmware_guestdump.c + * + * Copyright (c) 2020 VMware, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Author: Alexey Makhalov <amakhalov(a)vmware.com&gt; + */ + +#include "defs.h" +#include "vmware_vmss.h" + +#define LOGPRX "vmw: " + +#define GUESTDUMP_VERSION 4 +#define GUESTDUMP_MAGIC1 1 +#define GUESTDUMP_MAGIC2 0 + +struct guestdumpheader { + uint32_t version; + uint32_t num_vcpus; + uint8_t magic1; + uint8_t reserved1; + uint32_t cpu_vendor; + uint64_t magic2; + uint64_t last_addr; + uint64_t memsize_in_pages; + uint32_t reserved2; + uint32_t mem_holes; + struct memhole { + uint64_t ppn; + uint64_t pages; + } holes[2]; +} __attribute__((packed)); + +struct vcpu_state { + uint32_t cr0; + uint64_t cr2; + uint64_t cr3; + uint64_t cr4; + uint64_t reserved1[10]; + uint64_t idt_base; + uint16_t reserved2[21]; + struct x86_64_pt_regs { + uint64_t r15; + uint64_t r14; + uint64_t r13; + uint64_t r12; + uint64_t rbp; + uint64_t rbx; + uint64_t r11; + uint64_t r10; + uint64_t r9; + uint64_t r8; + uint64_t rax; + uint64_t rcx; + uint64_t rdx; + uint64_t rsi; + uint64_t rdi; + uint64_t orig_rax; + uint64_t rip; + uint64_t cs; + uint64_t eflags; + uint64_t rsp; + uint64_t ss; + } regs64; + uint8_t reserved3[65]; +} __attribute__((packed)); + + +/* + * vmware_guestdump is extension to vmware_vmss with ability to debug + * debug.guest and debug.vmem files. + * + * debug.guest.gz and debug.vmem.gz can be obtained using following + * .vmx options from VM running in debug mode: + * monitor.mini-suspend_on_panic = TRUE + * monitor.suspend_on_triplefault = TRUE + * + * guestdump (debug.guest) is simplified version of *.vmss which does + * not contain full VM state, but minimal guest state, such as memory + * layout and CPUs state, needed for debugger. is_vmware_guestdump() + * and vmware_guestdump_init() functions parse guestdump header and + * populate vmss data structure (from vmware_vmss.c). As result, all + * handlers (except mempry_dump) from vmware_vmss.c can be reused. + * + * debug.guest does not have dedicated header magic or signature for + * its format. To probe debug.guest we need to perform header fields + * and file size validity. In addition, check for the filename + * extension, which must be ".guest". + */ + +int +is_vmware_guestdump(char *filename) +{ + struct guestdumpheader hdr; + FILE *fp; + uint64_t filesize, holes_sum = 0; + int i; + + if (strcmp(filename + strlen(filename) - 6, ".guest")) + return FALSE; + + if ((fp = fopen(filename, "r")) == NULL) { + error(INFO, LOGPRX"Failed to open '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + return FALSE; + } + + if (fread(&hdr, sizeof(struct guestdumpheader), 1, fp) != 1) { + error(INFO, LOGPRX"Failed to read '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + fclose(fp); + return FALSE; + } + + if (fseek(fp, 0L, SEEK_END) == -1) { + error(INFO, LOGPRX"Failed to fseek '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + fclose(fp); + return FALSE; + } + filesize = ftell(fp); + fclose(fp); + + if (hdr.mem_holes > 2) + goto unrecognized; + + for (i = 0; i < hdr.mem_holes; i++) { + /* hole start page */ + vmss.regions[i].startpagenum = hdr.holes[i].ppn; + /* hole end page */ + vmss.regions[i].startppn = hdr.holes[i].ppn + hdr.holes[i].pages; + holes_sum += hdr.holes[i].pages; + } + + if (hdr.version != GUESTDUMP_VERSION || + hdr.magic1 != GUESTDUMP_MAGIC1 || + hdr.magic2 != GUESTDUMP_MAGIC2 || + (hdr.last_addr + 1) != ((hdr.memsize_in_pages + holes_sum) << VMW_PAGE_SHIFT) || + filesize != sizeof(struct guestdumpheader) + + hdr.num_vcpus * (sizeof (struct vcpu_state) + VMW_PAGE_SIZE)) + goto unrecognized; + + vmss.memsize = hdr.memsize_in_pages << VMW_PAGE_SHIFT; + vmss.regionscount = hdr.mem_holes + 1; + vmss.memoffset = 0; + vmss.num_vcpus = hdr.num_vcpus; + return TRUE; + +unrecognized: + if (CRASHDEBUG(1)) + error(INFO, LOGPRX"Unrecognized debug.guest file.\n"); + return FALSE; +} + +int +vmware_guestdump_init(char *filename, FILE *ofp) +{ + FILE *fp = NULL; + int i, result = TRUE; + char *vmem_filename = NULL; + struct vcpu_state vs; + char *p; + + if (!machine_type("X86") && !machine_type("X86_64")) { + error(INFO, + LOGPRX"Invalid or unsupported host architecture for .vmss file: %s\n", + MACHINE_TYPE); + result = FALSE; + goto exit; + } + + if ((fp = fopen(filename, "r")) == NULL) { + error(INFO, LOGPRX"Failed to open '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + result = FALSE; + goto exit; + } + + if (fseek(fp, sizeof(struct guestdumpheader), SEEK_SET) == -1) { + error(INFO, LOGPRX"Failed to fseek '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + result = FALSE; + goto exit; + } + + vmss.vcpu_regs = malloc(vmss.num_vcpus * sizeof(uint32_t)); + vmss.regs64 = calloc(vmss.num_vcpus, sizeof(void *)); + if (!vmss.vcpu_regs || !vmss.regs64) { + error(INFO, LOGPRX"Failed to allocate memory\n"); + result = FALSE; + goto exit; + } + + for (i = 0; i < vmss.num_vcpus; i++) { + if (fread(&vs, sizeof(struct vcpu_state), 1, fp) != 1) { + error(INFO, LOGPRX"Failed to read '%s': [Error %d] %s\n", + filename, errno, strerror(errno)); + result = FALSE; + goto exit; + } + vmss.regs64[i] = calloc(1, sizeof(vmssregs64)); + if (!vmss.regs64[i]) { + error(INFO, LOGPRX"Failed to allocate memory\n"); + result = FALSE; + goto exit; + } + vmss.vcpu_regs[i] = 0; + + vmss.regs64[i]->rax = vs.regs64.rax; + vmss.regs64[i]->rcx = vs.regs64.rcx; + vmss.regs64[i]->rdx = vs.regs64.rdx; + vmss.regs64[i]->rbx = vs.regs64.rbx; + vmss.regs64[i]->rbp = vs.regs64.rbp; + vmss.regs64[i]->rsp = vs.regs64.rsp; + vmss.regs64[i]->rsi = vs.regs64.rsi; + vmss.regs64[i]->rdi = vs.regs64.rdi; + vmss.regs64[i]->r8 = vs.regs64.r8; + vmss.regs64[i]->r9 = vs.regs64.r9; + vmss.regs64[i]->r10 = vs.regs64.r10; + vmss.regs64[i]->r11 = vs.regs64.r11; + vmss.regs64[i]->r12 = vs.regs64.r12; + vmss.regs64[i]->r13 = vs.regs64.r13; + vmss.regs64[i]->r14 = vs.regs64.r14; + vmss.regs64[i]->r15 = vs.regs64.r15; + vmss.regs64[i]->idtr = vs.idt_base; + vmss.regs64[i]->cr[0] = vs.cr0; + vmss.regs64[i]->cr[2] = vs.cr2; + vmss.regs64[i]->cr[3] = vs.cr3; + vmss.regs64[i]->cr[4] = vs.cr4; + vmss.regs64[i]->rip = vs.regs64.rip; + vmss.regs64[i]->rflags = vs.regs64.eflags; + + vmss.vcpu_regs[i] = REGS_PRESENT_ALL; + } + + vmem_filename = strdup(filename); + p = vmem_filename + strlen(vmem_filename) - 5; + if (strcmp(p, "guest") != 0) { + result = FALSE; + goto exit; + } + strcpy(p, "vmem"); + + fprintf(ofp, LOGPRX"Open the companion vmem file: %s\n", vmem_filename); + if ((vmss.dfp = fopen(vmem_filename, "r")) == NULL) { + error(INFO, LOGPRX"%s: %s\n", vmem_filename, strerror(errno)); + result = FALSE; + goto exit; + } + fseek(vmss.dfp, 0L, SEEK_END); + if (vmss.memsize != ftell(vmss.dfp)) { + error(INFO, LOGPRX"%s: unexpected size\n", vmem_filename); + result = FALSE; + goto exit; + } + fseek(vmss.dfp, 0L, SEEK_SET); + fprintf(ofp, LOGPRX"vmem file: %s\n\n", vmem_filename); + +exit: + if (fp) + fclose(fp); + if (vmem_filename) + free(vmem_filename); + if (result == FALSE) { + if (vmss.dfp) + fclose(vmss.dfp); + if (vmss.regs64) { + for (i = 0; i < vmss.num_vcpus; i++) { + if (vmss.regs64[i]) + free(vmss.regs64[i]); + } + free(vmss.regs64); + } + if (vmss.vcpu_regs) + free(vmss.vcpu_regs); + } + return result; +} + +int +vmware_guestdump_memory_dump(FILE *ofp) +{ + fprintf(ofp, "vmware_guestdump:\n"); + fprintf(ofp, " Header: version=%d num_vcpus=%ld\n", + GUESTDUMP_VERSION, vmss.num_vcpus); + fprintf(ofp, "Total memory: %ld\n", vmss.memsize); + + if (vmss.regionscount > 1) { + uint64_t holes_sum = 0; + unsigned i; + + fprintf(ofp, "Memory regions[%d]:\n", vmss.regionscount); + fprintf(ofp, " [0x%016x-", 0); + for (i = 0; i < vmss.regionscount - 1; i++) { + fprintf(ofp, "0x%016lx]\n", (uint64_t)vmss.regions[i].startpagenum << VMW_PAGE_SHIFT); + fprintf(ofp, " [0x%016lx-", (uint64_t)vmss.regions[i].startppn << VMW_PAGE_SHIFT); + holes_sum += vmss.regions[i].startppn - vmss.regions[i].startpagenum; + } + fprintf(ofp, "0x%016lx]\n", vmss.memsize + (holes_sum << VMW_PAGE_SHIFT)); + } + + return TRUE; +} + diff --git a/vmware_vmss.c b/vmware_vmss.c index 252bfa2..b168f29 100644 --- a/vmware_vmss.c +++ b/vmware_vmss.c @@ -23,13 +23,7 @@ #define LOGPRX "vmw: " -/* VMware only supports X86/X86_64 virtual machines. */ -#define VMW_PAGE_SIZE (4096) -#define VMW_PAGE_SHIFT (12) - -#define MAX_BLOCK_DUMP (128) - -static vmssdata vmss = { 0 }; +vmssdata vmss = { 0 }; int is_vmware_vmss(char *filename) diff --git a/vmware_vmss.h b/vmware_vmss.h index a5828a0..01d9446 100644 --- a/vmware_vmss.h +++ b/vmware_vmss.h @@ -165,6 +165,14 @@ struct vmssdata { }; typedef struct vmssdata vmssdata; +/* VMware only supports X86/X86_64 virtual machines. */ +#define VMW_PAGE_SIZE (4096) +#define VMW_PAGE_SHIFT (12) + +#define MAX_BLOCK_DUMP (128) + +extern vmssdata vmss; + #define DEBUG_PARSE_PRINT(x) \ do { \ if (CRASHDEBUG(1)) { \ -- 2.11.0