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init: Add support for zstd compressed kernel
- Add the zstd and zstd22 cmds to scripts/Makefile.lib - Add the HAVE_KERNEL_ZSTD and KERNEL_ZSTD options Architecture specific support is still needed for decompression. Signed-off-by: Nick Terrell <terrelln@fb.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200730190841.2071656-4-nickrterrell@gmail.com
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3
Makefile
3
Makefile
@ -464,6 +464,7 @@ KLZOP = lzop
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LZMA = lzma
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LZ4 = lz4c
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XZ = xz
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ZSTD = zstd
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CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
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-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
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@ -512,7 +513,7 @@ CLANG_FLAGS :=
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export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
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export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
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export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
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export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
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export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
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export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
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15
init/Kconfig
15
init/Kconfig
@ -191,13 +191,16 @@ config HAVE_KERNEL_LZO
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config HAVE_KERNEL_LZ4
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bool
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config HAVE_KERNEL_ZSTD
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bool
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config HAVE_KERNEL_UNCOMPRESSED
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bool
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choice
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prompt "Kernel compression mode"
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default KERNEL_GZIP
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depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED
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depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_ZSTD || HAVE_KERNEL_UNCOMPRESSED
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help
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The linux kernel is a kind of self-extracting executable.
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Several compression algorithms are available, which differ
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@ -276,6 +279,16 @@ config KERNEL_LZ4
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is about 8% bigger than LZO. But the decompression speed is
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faster than LZO.
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config KERNEL_ZSTD
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bool "ZSTD"
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depends on HAVE_KERNEL_ZSTD
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help
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ZSTD is a compression algorithm targeting intermediate compression
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with fast decompression speed. It will compress better than GZIP and
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decompress around the same speed as LZO, but slower than LZ4. You
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will need at least 192 KB RAM or more for booting. The zstd command
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line tool is required for compression.
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config KERNEL_UNCOMPRESSED
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bool "None"
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depends on HAVE_KERNEL_UNCOMPRESSED
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@ -413,6 +413,28 @@ quiet_cmd_xzkern = XZKERN $@
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quiet_cmd_xzmisc = XZMISC $@
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cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
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# ZSTD
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# ---------------------------------------------------------------------------
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# Appends the uncompressed size of the data using size_append. The .zst
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# format has the size information available at the beginning of the file too,
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# but it's in a more complex format and it's good to avoid changing the part
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# of the boot code that reads the uncompressed size.
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#
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# Note that the bytes added by size_append will make the zstd tool think that
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# the file is corrupt. This is expected.
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#
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# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
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# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
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# single pass, so zstd doesn't need to allocate a window buffer. When streaming
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# decompression is used, like initramfs decompression, zstd22 should likely not
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# be used because it would require zstd to allocate a 128 MB buffer.
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quiet_cmd_zstd = ZSTD $@
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cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@
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quiet_cmd_zstd22 = ZSTD22 $@
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cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
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# ASM offsets
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# ---------------------------------------------------------------------------
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