On Ampere Altra systems, the sparse population of RAM within the physical address space causes the vm_page_dump bitmap to be much larger than necessary, increasing the size from ~8 Mib to > 2 Gib (and overflowing `int` for the size). Changing the page dump bitmap also changes the minidump file format, so changes are also necessary in libkvm. Reviewed by: jhb Approved by: scottl (implicit) MFC after: 1 week Sponsored by: Ampere Computing, Inc. Differential Revision: https://reviews.freebsd.org/D26131
214 lines
6.4 KiB
C
214 lines
6.4 KiB
C
/*-
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* Copyright (c) 2006 Peter Wemm
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* Copyright (c) 2019 Leandro Lupori
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: FreeBSD: src/lib/libkvm/kvm_minidump_riscv.c
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../../sys/powerpc/include/minidump.h"
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#include "kvm_private.h"
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#include "kvm_powerpc64.h"
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static int
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_powerpc64_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
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_kvm_is_minidump(kd));
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}
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static void
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_powerpc64_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm == NULL)
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return;
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if (PPC64_MMU_OPS(kd))
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PPC64_MMU_OP(kd, cleanup);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_powerpc64_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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struct minidumphdr *hdr;
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off_t dump_avail_off, bitmap_off, pmap_off, sparse_off;
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const char *mmu_name;
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/* Alloc VM */
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vmst = _kvm_malloc(kd, sizeof(*vmst));
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if (vmst == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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hdr = &vmst->hdr;
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kd->vmst = vmst;
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PPC64_MMU_OPS(kd) = NULL;
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/* Read minidump header */
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if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) {
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_kvm_err(kd, kd->program, "cannot read minidump header");
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goto failed;
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}
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/* Check magic */
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if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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goto failed;
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}
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/* Check version */
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hdr->version = be32toh(hdr->version);
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if (hdr->version != MINIDUMP_VERSION && hdr->version != 1) {
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_kvm_err(kd, kd->program, "wrong minidump version. "
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"Expected %d got %d", MINIDUMP_VERSION, hdr->version);
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goto failed;
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}
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/* Convert header fields to host endian */
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hdr->msgbufsize = be32toh(hdr->msgbufsize);
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hdr->bitmapsize = be32toh(hdr->bitmapsize);
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hdr->pmapsize = be32toh(hdr->pmapsize);
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hdr->kernbase = be64toh(hdr->kernbase);
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hdr->kernend = be64toh(hdr->kernend);
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hdr->dmapbase = be64toh(hdr->dmapbase);
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hdr->dmapend = be64toh(hdr->dmapend);
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hdr->hw_direct_map = be32toh(hdr->hw_direct_map);
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hdr->startkernel = be64toh(hdr->startkernel);
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hdr->endkernel = be64toh(hdr->endkernel);
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hdr->dumpavailsize = hdr->version == MINIDUMP_VERSION ?
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be32toh(hdr->dumpavailsize) : 0;
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vmst->kimg_start = PPC64_KERNBASE;
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vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel;
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/* dump header */
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dprintf("%s: mmu_name=%s,\n\t"
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"msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, "
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"kernbase=0x%jx, kernend=0x%jx,\n\t"
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"dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, "
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"startkernel=0x%jx, endkernel=0x%jx\n\t"
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"kimg_start=0x%jx, kimg_end=0x%jx\n",
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__func__, hdr->mmu_name,
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(uintmax_t)hdr->msgbufsize,
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(uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize,
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(uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend,
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(uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend,
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hdr->hw_direct_map, hdr->startkernel, hdr->endkernel,
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(uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end);
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/* Detect and initialize MMU */
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mmu_name = hdr->mmu_name;
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if (strcmp(mmu_name, PPC64_MMU_G5) == 0 ||
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strcmp(mmu_name, PPC64_MMU_PHYP) == 0)
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PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt;
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else {
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_kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name);
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goto failed;
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}
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if (PPC64_MMU_OP(kd, init) == -1)
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goto failed;
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/* Get dump parts' offsets */
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dump_avail_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize);
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bitmap_off = dump_avail_off + ppc64_round_page(hdr->dumpavailsize);
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pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize);
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sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize);
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/* dump offsets */
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dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, "
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"sparse_off=0x%jx\n",
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__func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off,
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(uintmax_t)pmap_off, (uintmax_t)sparse_off);
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/* build physical address lookup table for sparse pages */
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if (_kvm_pt_init(kd, hdr->dumpavailsize, dump_avail_off,
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hdr->bitmapsize, bitmap_off, sparse_off, PPC64_PAGE_SIZE,
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sizeof(uint64_t)) == -1)
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goto failed;
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if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1)
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goto failed;
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return (0);
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failed:
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_powerpc64_minidump_freevtop(kd);
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return (-1);
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}
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static int
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_powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "%s called in live kernel!", __func__);
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return (0);
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}
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return (PPC64_MMU_OP(kd, kvatop, va, pa));
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}
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static int
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_powerpc64_native(kvm_t *kd __unused)
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{
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#ifdef __powerpc64__
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return (1);
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#else
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return (0);
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#endif
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}
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static kssize_t
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_powerpc64_kerndisp(kvm_t *kd)
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{
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return (kd->vmst->hdr.startkernel - PPC64_KERNBASE);
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}
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static int
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_powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
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{
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return (PPC64_MMU_OP(kd, walk_pages, cb, arg));
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}
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static struct kvm_arch kvm_powerpc64_minidump = {
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.ka_probe = _powerpc64_minidump_probe,
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.ka_initvtop = _powerpc64_minidump_initvtop,
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.ka_freevtop = _powerpc64_minidump_freevtop,
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.ka_kvatop = _powerpc64_minidump_kvatop,
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.ka_walk_pages = _powerpc64_minidump_walk_pages,
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.ka_native = _powerpc64_native,
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.ka_kerndisp = _powerpc64_kerndisp,
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};
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KVM_ARCH(kvm_powerpc64_minidump);
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