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123b6f8b82
crosvm originally omitted the region between (just below) 640 KB and up to the kernel load address (2 MB) from the e820 memory map provided to the kernel. This region is traditionally used for video memory, BIOS, and option ROMs in the PC architecture, but crosvm doesn't emulate any of the legacy hardware that would use this region; all of the low memory is actually just RAM. The memory map we report is only used for the direct kernel boot case, so it does not affect the memory layout reported when booting with a BIOS/UEFI firmware. Before: [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable [ 0.000000] BIOS-e820: [mem 0x0000000000200000-0x00000000cfffffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000f4000000-0x00000000f7ffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000001687fffff] usable [ 0.000000] BIOS-e820: [mem 0x0000000168800000-0x00000001707fffff] reserved After: [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x00000000cfffffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000f4000000-0x00000000f7ffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000001687fffff] usable [ 0.000000] BIOS-e820: [mem 0x0000000168800000-0x00000001707fffff] reserved BUG=None TEST=Boot x86-64 Linux kernel and OVMF Change-Id: I11fc377e466bc3aacadc21be0aad8db06712c248 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5518127 Reviewed-by: Dmitry Torokhov <dtor@chromium.org> Commit-Queue: Daniel Verkamp <dverkamp@chromium.org> |
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