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lib/libkvm/kvm_minidump_amd64.c

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#include <sys/cdefs.h> #include <sys/cdefs.h>
__FBSDID("$FreeBSD$"); __FBSDID("$FreeBSD$");
/* /*
* AMD64 machine dependent routines for kvm and minidumps. * AMD64 machine dependent routines for kvm and minidumps.
*/ */
#include <sys/param.h> #include <sys/param.h>
#include <sys/user.h> #include <sys/endian.h>
#include <sys/proc.h> #include <stdint.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/fnv_hash.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <nlist.h>
#include <kvm.h> #include <kvm.h>
#include <vm/vm.h> #include "../../sys/amd64/include/minidump.h"
#include <vm/vm_param.h>
#include <machine/elf.h>
#include <machine/cpufunc.h>
#include <machine/minidump.h>
#include <limits.h> #include <limits.h>
#include "kvm_private.h" #include "kvm_private.h"
#include "kvm_amd64.h"
struct hpte { #define amd64_round_page(x) roundup2((kvaddr_t)(x), AMD64_PAGE_SIZE)
struct hpte *next;
vm_paddr_t pa;
int64_t off;
};
#define HPT_SIZE 1024
/* minidump must be the first item! */
struct vmstate { struct vmstate {
int minidump; /* 1 = minidump mode */
struct minidumphdr hdr; struct minidumphdr hdr;
void *hpt_head[HPT_SIZE]; struct hpt hpt;
uint64_t *bitmap; amd64_pte_t *page_map;
uint64_t *page_map;
}; };
static void
hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off)
{
struct hpte *hpte;
uint32_t fnv = FNV1_32_INIT;
fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
fnv &= (HPT_SIZE - 1);
hpte = malloc(sizeof(*hpte));
hpte->pa = pa;
hpte->off = off;
hpte->next = kd->vmst->hpt_head[fnv];
kd->vmst->hpt_head[fnv] = hpte;
}
static int64_t
hpt_find(kvm_t *kd, vm_paddr_t pa)
{
struct hpte *hpte;
uint32_t fnv = FNV1_32_INIT;
fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
fnv &= (HPT_SIZE - 1);
for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
if (pa == hpte->pa)
return (hpte->off);
}
return (-1);
}
static int static int
inithash(kvm_t *kd, uint64_t *base, int len, off_t off) _amd64_minidump_probe(kvm_t *kd)
{ {
uint64_t idx;
uint64_t bit, bits;
vm_paddr_t pa;
for (idx = 0; idx < len / sizeof(*base); idx++) { return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_X86_64) &&
bits = base[idx]; _kvm_is_minidump(kd));
while (bits) {
bit = bsfq(bits);
bits &= ~(1ul << bit);
pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
hpt_insert(kd, pa, off);
off += PAGE_SIZE;
} }
}
return (off);
}
void static void
_kvm_minidump_freevtop(kvm_t *kd) _amd64_minidump_freevtop(kvm_t *kd)
{ {
struct vmstate *vm = kd->vmst; struct vmstate *vm = kd->vmst;
if (vm->bitmap) _kvm_hpt_free(&vm->hpt);
free(vm->bitmap);
if (vm->page_map) if (vm->page_map)
free(vm->page_map); free(vm->page_map);
free(vm); free(vm);
kd->vmst = NULL; kd->vmst = NULL;
} }
int static int
_kvm_minidump_initvtop(kvm_t *kd) _amd64_minidump_initvtop(kvm_t *kd)
{ {
struct vmstate *vmst; struct vmstate *vmst;
uint64_t *bitmap;
off_t off; off_t off;
vmst = _kvm_malloc(kd, sizeof(*vmst)); vmst = _kvm_malloc(kd, sizeof(*vmst));
if (vmst == 0) { if (vmst == 0) {
_kvm_err(kd, kd->program, "cannot allocate vm"); _kvm_err(kd, kd->program, "cannot allocate vm");
return (-1); return (-1);
} }
kd->vmst = vmst; kd->vmst = vmst;
vmst->minidump = 1;
if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
sizeof(vmst->hdr)) { sizeof(vmst->hdr)) {
_kvm_err(kd, kd->program, "cannot read dump header"); _kvm_err(kd, kd->program, "cannot read dump header");
return (-1); return (-1);
} }
if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
_kvm_err(kd, kd->program, "not a minidump for this platform"); _kvm_err(kd, kd->program, "not a minidump for this platform");
return (-1); return (-1);
} }
/* /*
* NB: amd64 minidump header is binary compatible between version 1 * NB: amd64 minidump header is binary compatible between version 1
* and version 2; this may not be the case for the future versions. * and version 2; this may not be the case for the future versions.
*/ */
vmst->hdr.version = le32toh(vmst->hdr.version);
if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) { if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
_kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
MINIDUMP_VERSION, vmst->hdr.version); MINIDUMP_VERSION, vmst->hdr.version);
return (-1); return (-1);
} }
vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
/* Skip header and msgbuf */ /* Skip header and msgbuf */
off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); off = AMD64_PAGE_SIZE + amd64_round_page(vmst->hdr.msgbufsize);
vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
if (vmst->bitmap == NULL) { if (bitmap == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize); _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
return (-1); return (-1);
} }
if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
vmst->hdr.bitmapsize) { (ssize_t)vmst->hdr.bitmapsize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize); _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
free(bitmap);
return (-1); return (-1);
} }
off += round_page(vmst->hdr.bitmapsize); off += amd64_round_page(vmst->hdr.bitmapsize);
vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize); vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
if (vmst->page_map == NULL) { if (vmst->page_map == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for page_map", vmst->hdr.pmapsize); _kvm_err(kd, kd->program, "cannot allocate %d bytes for page_map", vmst->hdr.pmapsize);
free(bitmap);
return (-1); return (-1);
} }
if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) != if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) !=
vmst->hdr.pmapsize) { (ssize_t)vmst->hdr.pmapsize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for page_map", vmst->hdr.pmapsize); _kvm_err(kd, kd->program, "cannot read %d bytes for page_map", vmst->hdr.pmapsize);
free(bitmap);
return (-1); return (-1);
} }
off += vmst->hdr.pmapsize; off += vmst->hdr.pmapsize;
/* build physical address hash table for sparse pages */ /* build physical address hash table for sparse pages */
inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
AMD64_PAGE_SIZE, sizeof(*bitmap));
free(bitmap);
return (0); return (0);
} }
static int static int
_kvm_minidump_vatop_v1(kvm_t *kd, u_long va, off_t *pa) _amd64_minidump_vatop_v1(kvm_t *kd, kvaddr_t va, off_t *pa)
{ {
struct vmstate *vm; struct vmstate *vm;
u_long offset; amd64_physaddr_t offset;
pt_entry_t pte; amd64_pte_t pte;
u_long pteindex; kvaddr_t pteindex;
u_long a; amd64_physaddr_t a;
off_t ofs; off_t ofs;
vm = kd->vmst; vm = kd->vmst;
offset = va & (PAGE_SIZE - 1); offset = va & AMD64_PAGE_MASK;
if (va >= vm->hdr.kernbase) { if (va >= vm->hdr.kernbase) {
pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; pteindex = (va - vm->hdr.kernbase) >> AMD64_PAGE_SHIFT;
if (pteindex >= vm->hdr.pmapsize / sizeof(*vm->page_map)) if (pteindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
goto invalid; goto invalid;
pte = vm->page_map[pteindex]; pte = le64toh(vm->page_map[pteindex]);
if (((u_long)pte & PG_V) == 0) { if ((pte & AMD64_PG_V) == 0) {
_kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop_v1: pte not valid");
goto invalid; goto invalid;
} }
a = pte & PG_FRAME; a = pte & AMD64_PG_FRAME;
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop_v1: physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid; goto invalid;
} }
*pa = ofs + offset; *pa = ofs + offset;
return (PAGE_SIZE - offset); return (AMD64_PAGE_SIZE - offset);
} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
a = (va - vm->hdr.dmapbase) & ~PAGE_MASK; a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop_v1: direct map address 0x%jx not in minidump",
(uintmax_t)va);
goto invalid; goto invalid;
} }
*pa = ofs + offset; *pa = ofs + offset;
return (PAGE_SIZE - offset); return (AMD64_PAGE_SIZE - offset);
} else { } else {
_kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop_v1: virtual address 0x%jx not minidumped",
(uintmax_t)va);
goto invalid; goto invalid;
} }
invalid: invalid:
_kvm_err(kd, 0, "invalid address (0x%lx)", va); _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0); return (0);
} }
static int static int
_kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa) _amd64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{ {
pt_entry_t pt[NPTEPG]; amd64_pte_t pt[AMD64_NPTEPG];
struct vmstate *vm; struct vmstate *vm;
u_long offset; amd64_physaddr_t offset;
pd_entry_t pde; amd64_pde_t pde;
pd_entry_t pte; amd64_pte_t pte;
u_long pteindex; kvaddr_t pteindex;
u_long pdeindex; kvaddr_t pdeindex;
u_long a; amd64_physaddr_t a;
off_t ofs; off_t ofs;
vm = kd->vmst; vm = kd->vmst;
offset = va & PAGE_MASK; offset = va & AMD64_PAGE_MASK;
if (va >= vm->hdr.kernbase) { if (va >= vm->hdr.kernbase) {
pdeindex = (va - vm->hdr.kernbase) >> PDRSHIFT; pdeindex = (va - vm->hdr.kernbase) >> AMD64_PDRSHIFT;
if (pdeindex >= vm->hdr.pmapsize / sizeof(*vm->page_map)) if (pdeindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
goto invalid; goto invalid;
pde = vm->page_map[pdeindex]; pde = le64toh(vm->page_map[pdeindex]);
if (((u_long)pde & PG_V) == 0) { if ((pde & AMD64_PG_V) == 0) {
_kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop: pde not valid");
goto invalid; goto invalid;
} }
if ((pde & PG_PS) == 0) { if ((pde & AMD64_PG_PS) == 0) {
a = pde & PG_FRAME; a = pde & AMD64_PG_FRAME;
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: pt physical address 0x%lx not in minidump", a); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop: pt physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid; goto invalid;
} }
if (pread(kd->pmfd, &pt, PAGE_SIZE, ofs) != PAGE_SIZE) { /* TODO: Just read the single PTE */
_kvm_err(kd, kd->program, "cannot read %d bytes for pt", PAGE_SIZE); if (pread(kd->pmfd, &pt, AMD64_PAGE_SIZE, ofs) !=
AMD64_PAGE_SIZE) {
_kvm_err(kd, kd->program,
"cannot read %d bytes for page table",
AMD64_PAGE_SIZE);
return (-1); return (-1);
} }
pteindex = (va >> PAGE_SHIFT) & ((1ul << NPTEPGSHIFT) - 1); pteindex = (va >> AMD64_PAGE_SHIFT) &
pte = pt[pteindex]; (AMD64_NPTEPG - 1);
if (((u_long)pte & PG_V) == 0) { pte = le64toh(pt[pteindex]);
_kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); if ((pte & AMD64_PG_V) == 0) {
_kvm_err(kd, kd->program,
"_amd64_minidump_vatop: pte not valid");
goto invalid; goto invalid;
} }
a = pte & PG_FRAME; a = pte & AMD64_PG_FRAME;
} else { } else {
a = pde & PG_PS_FRAME; a = pde & AMD64_PG_PS_FRAME;
a += (va & PDRMASK) ^ offset; a += (va & AMD64_PDRMASK) ^ offset;
} }
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop: physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid; goto invalid;
} }
*pa = ofs + offset; *pa = ofs + offset;
return (PAGE_SIZE - offset); return (AMD64_PAGE_SIZE - offset);
} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
a = (va - vm->hdr.dmapbase) & ~PAGE_MASK; a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop: direct map address 0x%jx not in minidump",
(uintmax_t)va);
goto invalid; goto invalid;
} }
*pa = ofs + offset; *pa = ofs + offset;
return (PAGE_SIZE - offset); return (AMD64_PAGE_SIZE - offset);
} else { } else {
_kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va); _kvm_err(kd, kd->program,
"_amd64_minidump_vatop: virtual address 0x%jx not minidumped",
(uintmax_t)va);
goto invalid; goto invalid;
} }
invalid: invalid:
_kvm_err(kd, 0, "invalid address (0x%lx)", va); _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0); return (0);
} }
int static int
_kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) _amd64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{ {
if (ISALIVE(kd)) { if (ISALIVE(kd)) {
_kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); _kvm_err(kd, 0,
"_amd64_minidump_kvatop called in live kernel!");
return (0); return (0);
} }
if (((struct vmstate *)kd->vmst)->hdr.version == 1) if (((struct vmstate *)kd->vmst)->hdr.version == 1)
return (_kvm_minidump_vatop_v1(kd, va, pa)); return (_amd64_minidump_vatop_v1(kd, va, pa));
else else
return (_kvm_minidump_vatop(kd, va, pa)); return (_amd64_minidump_vatop(kd, va, pa));
} }
struct kvm_arch kvm_amd64_minidump = {
.ka_probe = _amd64_minidump_probe,
.ka_initvtop = _amd64_minidump_initvtop,
.ka_freevtop = _amd64_minidump_freevtop,
.ka_kvatop = _amd64_minidump_kvatop,
.ka_native = _amd64_native,
};
KVM_ARCH(kvm_amd64_minidump);