ppc64: fix compressed dump with pseries kernel
If we don't provide the page size in target-ppc:cpu_get_dump_info(), the default one (TARGET_PAGE_SIZE, 4KB) is used to create the compressed dump. It works fine with Macintosh, but not with pseries as the kernel default page size is 64KB. Without this patch, if we generate a compressed dump in the QEMU monitor: (qemu) dump-guest-memory -z qemu.dump This dump cannot be read by crash: # crash vmlinux qemu.dump ... WARNING: cannot translate vmemmap kernel virtual addresses: commands requiring page structure contents will fail ... Page_size is used to determine the dumpfile's block size. The block size needs to be at least the page size, but a multiple of page size works fine too. For PPC64, linux supports either 4KB or 64KB software page size. So we define the page_size to 64KB. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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@ -220,6 +220,11 @@ int cpu_get_dump_info(ArchDumpInfo *info,
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} else {
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} else {
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info->d_endian = ELFDATA2LSB;
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info->d_endian = ELFDATA2LSB;
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}
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}
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/* 64KB is the max page size for pseries kernel */
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if (strncmp(object_get_typename(qdev_get_machine()),
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"pseries-", 8) == 0) {
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info->page_size = (1U << 16);
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}
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return 0;
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return 0;
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}
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}
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