d1ca8cc638
Linux has two bugs in its handling of the x86 MP table: 1. It assumes that there is always 640 kB of base memory, and looks for the MP table in the top kB of this even if the memory map indicates that memory location does not exist. 2. It ignores that entry_count field and instead iterates through the MP table by scanning until it runs out of bytes in the table. The Firecracker VM (and probably other related VMs) relies on both of these bugs. With the MPTABLE_LINUX_BUG_COMPAT option, we search for the MP table at address 639k even if that isn't in the memory map; and replace a zeroed entry_count with a value computed from scanning the table until we run out of table bytes. Reviewed by: imp Sponsored by: https://www.patreon.com/cperciva Differential Revision: https://reviews.freebsd.org/D35799
69 lines
1.5 KiB
Plaintext
69 lines
1.5 KiB
Plaintext
# $FreeBSD$
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# Options specific to AMD64 platform kernels
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AUTO_EOI_1 opt_auto_eoi.h
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AUTO_EOI_2 opt_auto_eoi.h
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BHYVE_SNAPSHOT
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COUNT_XINVLTLB_HITS opt_smp.h
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COUNT_IPIS opt_smp.h
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MAXMEM
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MPTABLE_FORCE_HTT
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NKPT opt_pmap.h
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PV_STATS opt_pmap.h
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# Options for emulators. These should only be used at config time, so
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# they are handled like options for static filesystems
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# (see src/sys/conf/options), except for broken debugging options.
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COMPAT_AOUT opt_dontuse.h
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COMPAT_FREEBSD32 opt_global.h
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#COMPAT_LINUX opt_dontuse.h
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COMPAT_LINUX32 opt_dontuse.h
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LINPROCFS opt_dontuse.h
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LINSYSFS opt_dontuse.h
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TIMER_FREQ opt_clock.h
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VGA_ALT_SEQACCESS opt_vga.h
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VGA_DEBUG opt_vga.h
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VGA_NO_FONT_LOADING opt_vga.h
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VGA_NO_MODE_CHANGE opt_vga.h
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VGA_SLOW_IOACCESS opt_vga.h
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VGA_WIDTH90 opt_vga.h
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VESA
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VESA_DEBUG opt_vesa.h
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# AGP debugging support
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AGP_DEBUG opt_agp.h
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ATKBD_DFLT_KEYMAP opt_atkbd.h
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# iWARP client interface support in ixl
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IXL_IW opt_ixl.h
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# -------------------------------
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# EOF
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# -------------------------------
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HAMMER opt_cpu.h
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PSM_HOOKRESUME opt_psm.h
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PSM_RESETAFTERSUSPEND opt_psm.h
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PSM_DEBUG opt_psm.h
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DEV_ATPIC opt_atpic.h
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# BPF just-in-time compiler
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BPF_JITTER opt_bpf.h
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XENHVM opt_global.h
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# options for the Intel C600 SAS driver (isci)
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ISCI_LOGGING opt_isci.h
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# EFI Runtime services support
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EFIRT opt_efirt.h
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# Don't create a "legacy" PCI bridge if none is found.
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NO_LEGACY_PCIB opt_cpu.h
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# Compatibility with Linux MP table bugs.
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MPTABLE_LINUX_BUG_COMPAT
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