X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=dump.c;h=107a67165a645dcd96dfcf64dfd6d398915014b1;hb=28605a22f564860c885bde42ad91840e9aacec45;hp=a79773d0f7e2dfe1d9564f2d026cf54952004c0a;hpb=1d2a8e0690a8b26833346c6e84e91773da66fbf4;p=mirror_qemu.git

diff --git a/dump.c b/dump.c
index a79773d0f7..107a67165a 100644
--- a/dump.c
+++ b/dump.c
@@ -15,7 +15,6 @@
 #include "qemu/cutils.h"
 #include "elf.h"
 #include "cpu.h"
-#include "exec/cpu-all.h"
 #include "exec/hwaddr.h"
 #include "monitor/monitor.h"
 #include "sysemu/kvm.h"
@@ -23,9 +22,16 @@
 #include "sysemu/sysemu.h"
 #include "sysemu/memory_mapping.h"
 #include "sysemu/cpus.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-misc.h"
+#include "qapi/qapi-events-misc.h"
 #include "qapi/qmp/qerror.h"
-#include "qmp-commands.h"
-#include "qapi-event.h"
+#include "qemu/error-report.h"
+#include "hw/misc/vmcoreinfo.h"
+
+#ifdef TARGET_X86_64
+#include "win_dump.h"
+#endif
 
 #include <zlib.h>
 #ifdef CONFIG_LZO
@@ -38,6 +44,13 @@
 #define ELF_MACHINE_UNAME "Unknown"
 #endif
 
+#define MAX_GUEST_NOTE_SIZE (1 << 20) /* 1MB should be enough */
+
+#define ELF_NOTE_SIZE(hdr_size, name_size, desc_size)   \
+    ((DIV_ROUND_UP((hdr_size), 4) +                     \
+      DIV_ROUND_UP((name_size), 4) +                    \
+      DIV_ROUND_UP((desc_size), 4)) * 4)
+
 uint16_t cpu_to_dump16(DumpState *s, uint16_t val)
 {
     if (s->dump_info.d_endian == ELFDATA2LSB) {
@@ -76,6 +89,8 @@ static int dump_cleanup(DumpState *s)
     guest_phys_blocks_free(&s->guest_phys_blocks);
     memory_mapping_list_free(&s->list);
     close(s->fd);
+    g_free(s->guest_note);
+    s->guest_note = NULL;
     if (s->resume) {
         if (s->detached) {
             qemu_mutex_lock_iothread();
@@ -96,7 +111,7 @@ static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
 
     written_size = qemu_write_full(s->fd, buf, size);
     if (written_size != size) {
-        return -1;
+        return -errno;
     }
 
     return 0;
@@ -129,7 +144,7 @@ static void write_elf64_header(DumpState *s, Error **errp)
 
     ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write elf header");
+        error_setg_errno(errp, -ret, "dump: failed to write elf header");
     }
 }
 
@@ -160,7 +175,7 @@ static void write_elf32_header(DumpState *s, Error **errp)
 
     ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write elf header");
+        error_setg_errno(errp, -ret, "dump: failed to write elf header");
     }
 }
 
@@ -177,13 +192,14 @@ static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping,
     phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr);
     phdr.p_filesz = cpu_to_dump64(s, filesz);
     phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length);
-    phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr);
+    phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr;
 
     assert(memory_mapping->length >= filesz);
 
     ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write program header table");
+        error_setg_errno(errp, -ret,
+                         "dump: failed to write program header table");
     }
 }
 
@@ -200,13 +216,15 @@ static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,
     phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr);
     phdr.p_filesz = cpu_to_dump32(s, filesz);
     phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length);
-    phdr.p_vaddr = cpu_to_dump32(s, memory_mapping->virt_addr);
+    phdr.p_vaddr =
+        cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr;
 
     assert(memory_mapping->length >= filesz);
 
     ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write program header table");
+        error_setg_errno(errp, -ret,
+                         "dump: failed to write program header table");
     }
 }
 
@@ -226,7 +244,8 @@ static void write_elf64_note(DumpState *s, Error **errp)
 
     ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write program header table");
+        error_setg_errno(errp, -ret,
+                         "dump: failed to write program header table");
     }
 }
 
@@ -235,6 +254,19 @@ static inline int cpu_index(CPUState *cpu)
     return cpu->cpu_index + 1;
 }
 
+static void write_guest_note(WriteCoreDumpFunction f, DumpState *s,
+                             Error **errp)
+{
+    int ret;
+
+    if (s->guest_note) {
+        ret = f(s->guest_note, s->guest_note_size, s);
+        if (ret < 0) {
+            error_setg(errp, "dump: failed to write guest note");
+        }
+    }
+}
+
 static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s,
                               Error **errp)
 {
@@ -258,6 +290,8 @@ static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s,
             return;
         }
     }
+
+    write_guest_note(f, s, errp);
 }
 
 static void write_elf32_note(DumpState *s, Error **errp)
@@ -276,7 +310,8 @@ static void write_elf32_note(DumpState *s, Error **errp)
 
     ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write program header table");
+        error_setg_errno(errp, -ret,
+                         "dump: failed to write program header table");
     }
 }
 
@@ -303,6 +338,8 @@ static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s,
             return;
         }
     }
+
+    write_guest_note(f, s, errp);
 }
 
 static void write_elf_section(DumpState *s, int type, Error **errp)
@@ -327,7 +364,8 @@ static void write_elf_section(DumpState *s, int type, Error **errp)
 
     ret = fd_write_vmcore(&shdr, shdr_size, s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to write section header table");
+        error_setg_errno(errp, -ret,
+                         "dump: failed to write section header table");
     }
 }
 
@@ -337,7 +375,7 @@ static void write_data(DumpState *s, void *buf, int length, Error **errp)
 
     ret = fd_write_vmcore(buf, length, s);
     if (ret < 0) {
-        error_setg(errp, "dump: failed to save memory");
+        error_setg_errno(errp, -ret, "dump: failed to save memory");
     } else {
         s->written_size += length;
     }
@@ -714,6 +752,56 @@ static int buf_write_note(const void *buf, size_t size, void *opaque)
     return 0;
 }
 
+/*
+ * This function retrieves various sizes from an elf header.
+ *
+ * @note has to be a valid ELF note. The return sizes are unmodified
+ * (not padded or rounded up to be multiple of 4).
+ */
+static void get_note_sizes(DumpState *s, const void *note,
+                           uint64_t *note_head_size,
+                           uint64_t *name_size,
+                           uint64_t *desc_size)
+{
+    uint64_t note_head_sz;
+    uint64_t name_sz;
+    uint64_t desc_sz;
+
+    if (s->dump_info.d_class == ELFCLASS64) {
+        const Elf64_Nhdr *hdr = note;
+        note_head_sz = sizeof(Elf64_Nhdr);
+        name_sz = tswap64(hdr->n_namesz);
+        desc_sz = tswap64(hdr->n_descsz);
+    } else {
+        const Elf32_Nhdr *hdr = note;
+        note_head_sz = sizeof(Elf32_Nhdr);
+        name_sz = tswap32(hdr->n_namesz);
+        desc_sz = tswap32(hdr->n_descsz);
+    }
+
+    if (note_head_size) {
+        *note_head_size = note_head_sz;
+    }
+    if (name_size) {
+        *name_size = name_sz;
+    }
+    if (desc_size) {
+        *desc_size = desc_sz;
+    }
+}
+
+static bool note_name_equal(DumpState *s,
+                            const uint8_t *note, const char *name)
+{
+    int len = strlen(name) + 1;
+    uint64_t head_size, name_size;
+
+    get_note_sizes(s, note, &head_size, &name_size, NULL);
+    head_size = ROUND_UP(head_size, 4);
+
+    return name_size == len && memcmp(note + head_size, name, len) == 0;
+}
+
 /* write common header, sub header and elf note to vmcore */
 static void create_header32(DumpState *s, Error **errp)
 {
@@ -731,7 +819,7 @@ static void create_header32(DumpState *s, Error **errp)
     size = sizeof(DiskDumpHeader32);
     dh = g_malloc0(size);
 
-    strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
+    memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN);
     dh->header_version = cpu_to_dump32(s, 6);
     block_size = s->dump_info.page_size;
     dh->block_size = cpu_to_dump32(s, block_size);
@@ -775,6 +863,18 @@ static void create_header32(DumpState *s, Error **errp)
     kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
 
     offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
+    if (s->guest_note &&
+        note_name_equal(s, s->guest_note, "VMCOREINFO")) {
+        uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo;
+
+        get_note_sizes(s, s->guest_note,
+                       &hsize, &name_size, &size_vmcoreinfo_desc);
+        offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size +
+            (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4;
+        kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo);
+        kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc);
+    }
+
     kh->offset_note = cpu_to_dump64(s, offset_note);
     kh->note_size = cpu_to_dump32(s, s->note_size);
 
@@ -831,7 +931,7 @@ static void create_header64(DumpState *s, Error **errp)
     size = sizeof(DiskDumpHeader64);
     dh = g_malloc0(size);
 
-    strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
+    memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN);
     dh->header_version = cpu_to_dump32(s, 6);
     block_size = s->dump_info.page_size;
     dh->block_size = cpu_to_dump32(s, block_size);
@@ -875,6 +975,18 @@ static void create_header64(DumpState *s, Error **errp)
     kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
 
     offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
+    if (s->guest_note &&
+        note_name_equal(s, s->guest_note, "VMCOREINFO")) {
+        uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo;
+
+        get_note_sizes(s, s->guest_note,
+                       &hsize, &name_size, &size_vmcoreinfo_desc);
+        offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size +
+            (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4;
+        kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo);
+        kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc);
+    }
+
     kh->offset_note = cpu_to_dump64(s, offset_note);
     kh->note_size = cpu_to_dump64(s, s->note_size);
 
@@ -1446,7 +1558,7 @@ static void get_max_mapnr(DumpState *s)
 {
     GuestPhysBlock *last_block;
 
-    last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead);
+    last_block = QTAILQ_LAST(&s->guest_phys_blocks.head);
     s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end);
 }
 
@@ -1488,10 +1600,52 @@ static int64_t dump_calculate_size(DumpState *s)
     return total;
 }
 
+static void vmcoreinfo_update_phys_base(DumpState *s)
+{
+    uint64_t size, note_head_size, name_size, phys_base;
+    char **lines;
+    uint8_t *vmci;
+    size_t i;
+
+    if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) {
+        return;
+    }
+
+    get_note_sizes(s, s->guest_note, &note_head_size, &name_size, &size);
+    note_head_size = ROUND_UP(note_head_size, 4);
+
+    vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4);
+    *(vmci + size) = '\0';
+
+    lines = g_strsplit((char *)vmci, "\n", -1);
+    for (i = 0; lines[i]; i++) {
+        const char *prefix = NULL;
+
+        if (s->dump_info.d_machine == EM_X86_64) {
+            prefix = "NUMBER(phys_base)=";
+        } else if (s->dump_info.d_machine == EM_AARCH64) {
+            prefix = "NUMBER(PHYS_OFFSET)=";
+        }
+
+        if (prefix && g_str_has_prefix(lines[i], prefix)) {
+            if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16,
+                              &phys_base) < 0) {
+                warn_report("Failed to read %s", prefix);
+            } else {
+                s->dump_info.phys_base = phys_base;
+            }
+            break;
+        }
+    }
+
+    g_strfreev(lines);
+}
+
 static void dump_init(DumpState *s, int fd, bool has_format,
                       DumpGuestMemoryFormat format, bool paging, bool has_filter,
                       int64_t begin, int64_t length, Error **errp)
 {
+    VMCoreInfoState *vmci = vmcoreinfo_find();
     CPUState *cpu;
     int nr_cpus;
     Error *err = NULL;
@@ -1536,6 +1690,12 @@ static void dump_init(DumpState *s, int fd, bool has_format,
     fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size);
 #endif
 
+    /* it does not make sense to dump non-existent memory */
+    if (!s->total_size) {
+        error_setg(errp, "dump: no guest memory to dump");
+        goto cleanup;
+    }
+
     s->start = get_start_block(s);
     if (s->start == -1) {
         error_setg(errp, QERR_INVALID_PARAMETER, "begin");
@@ -1563,6 +1723,48 @@ static void dump_init(DumpState *s, int fd, bool has_format,
         goto cleanup;
     }
 
+    /*
+     * The goal of this block is to (a) update the previously guessed
+     * phys_base, (b) copy the guest note out of the guest.
+     * Failure to do so is not fatal for dumping.
+     */
+    if (vmci) {
+        uint64_t addr, note_head_size, name_size, desc_size;
+        uint32_t size;
+        uint16_t format;
+
+        note_head_size = s->dump_info.d_class == ELFCLASS32 ?
+            sizeof(Elf32_Nhdr) : sizeof(Elf64_Nhdr);
+
+        format = le16_to_cpu(vmci->vmcoreinfo.guest_format);
+        size = le32_to_cpu(vmci->vmcoreinfo.size);
+        addr = le64_to_cpu(vmci->vmcoreinfo.paddr);
+        if (!vmci->has_vmcoreinfo) {
+            warn_report("guest note is not present");
+        } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) {
+            warn_report("guest note size is invalid: %" PRIu32, size);
+        } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) {
+            warn_report("guest note format is unsupported: %" PRIu16, format);
+        } else {
+            s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */
+            cpu_physical_memory_read(addr, s->guest_note, size);
+
+            get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size);
+            s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size,
+                                               desc_size);
+            if (name_size > MAX_GUEST_NOTE_SIZE ||
+                desc_size > MAX_GUEST_NOTE_SIZE ||
+                s->guest_note_size > size) {
+                warn_report("Invalid guest note header");
+                g_free(s->guest_note);
+                s->guest_note = NULL;
+            } else {
+                vmcoreinfo_update_phys_base(s);
+                s->note_size += s->guest_note_size;
+            }
+        }
+    }
+
     /* get memory mapping */
     if (paging) {
         qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err);
@@ -1669,7 +1871,11 @@ static void dump_process(DumpState *s, Error **errp)
     Error *local_err = NULL;
     DumpQueryResult *result = NULL;
 
-    if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
+    if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) {
+#ifdef TARGET_X86_64
+        create_win_dump(s, &local_err);
+#endif
+    } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
         create_kdump_vmcore(s, &local_err);
     } else {
         create_vmcore(s, &local_err);
@@ -1685,8 +1891,7 @@ static void dump_process(DumpState *s, Error **errp)
     /* should never fail */
     assert(result);
     qapi_event_send_dump_completed(result, !!local_err, (local_err ? \
-                                   error_get_pretty(local_err) : NULL),
-                                   &error_abort);
+                                   error_get_pretty(local_err) : NULL));
     qapi_free_DumpQueryResult(result);
 
     error_propagate(errp, local_err);
@@ -1773,6 +1978,13 @@ void qmp_dump_guest_memory(bool paging, const char *file,
     }
 #endif
 
+#ifndef TARGET_X86_64
+    if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) {
+        error_setg(errp, "Windows dump is only available for x86-64");
+        return;
+    }
+#endif
+
 #if !defined(WIN32)
     if (strstart(file, "fd:", &p)) {
         fd = monitor_get_fd(cur_mon, p, errp);
@@ -1847,5 +2059,12 @@ DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
     item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
 #endif
 
+    /* Windows dump is available only if target is x86_64 */
+#ifdef TARGET_X86_64
+    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+    item = item->next;
+    item->value = DUMP_GUEST_MEMORY_FORMAT_WIN_DMP;
+#endif
+
     return cap;
 }