Messages in this thread Patch in this message | | | Date | Thu, 29 May 2008 14:37:19 +0100 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] x86: extend e820 ealy_res support 32bit - fix #2 |
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Yinghai Lu wrote: > can we use e820 entries for that? So the domain builder could have > several entries for E820_RAM and E820_RESERVED... >
I tried this, but it doesn't work; the kernel crashes during boot, presumably because it's trying to use the reserved memory as heap. I suspect the e820 maps are not registered early enough or something...
(One thought: if reserving in the E820 map were enough, then couldn't we use it for all the early reservations?)
I've attached the non-working patch below.
The working kernel reports:
(early) BIOS-provided physical RAM map: (early) Xen: 0000000000000000 - 000000000009f000 (usable) (early) Xen: 0000000000100000 - 0000000010000000 (usable) (early) console [xenboot0] enabled (early) debug: ignoring loglevel setting. (early) 0MB HIGHMEM available. (early) 256MB LOWMEM available. (early) low ram: 018fd000 - 10000000 (early) bootmap 018fd000 - 018ff000 (early) early res: 0 [0-fff] BIOS data page (early) early res: 1 [1000-1fff] EX TRAMPOLINE (early) early res: 2 [6000-6fff] TRAMPOLINE (early) early res: 3 [18aa000-18ecfff] XEN (early) early res: 4 [1000000-18a9303] TEXT DATA BSS (early) early res: 5 [18ed000-18fcfff] INIT_PG_TABLE (early) early res: 6 [18fd000-18fefff] BOOTMAP
But the non-working one says:
(early) BIOS-provided physical RAM map: (early) Xen: 0000000000000000 - 000000000009f000 (usable) (early) Xen: 0000000000100000 - 0000000010000000 (usable) (early) Xen: 00000000018aa000 - 00000000018ed000 (reserved) (early) console [xenboot0] enabled (early) debug: ignoring loglevel setting. (early) 0MB HIGHMEM available. (early) 256MB LOWMEM available. (early) low ram: 018fd000 - 10000000 (early) bootmap 018fd000 - 018ff000 (early) early res: 0 [0-fff] BIOS data page (early) early res: 1 [1000-1fff] EX TRAMPOLINE (early) early res: 2 [6000-6fff] TRAMPOLINE (early) early res: 3 [1000000-18a9303] TEXT DATA BSS (early) early res: 4 [18ed000-18fcfff] INIT_PG_TABLE (early) early res: 5 [18fd000-18fefff] BOOTMAP
J
Subject: xen: reserve Xen-specific memory in e820 map
Make sure that the start_info and pfn->mfn translation array are reserved.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> --- arch/x86/xen/setup.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff -r ad372188bccf arch/x86/xen/setup.c --- a/arch/x86/xen/setup.c Thu May 29 13:56:09 2008 +0100 +++ b/arch/x86/xen/setup.c Thu May 29 14:34:35 2008 +0100 @@ -40,9 +40,19 @@ max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); e820.nr_map = 0; + add_memory_region(0, LOWMEMSIZE(), E820_RAM); add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM); + /* + * Reserve Xen bits: + * - mfn_list + * - xen_start_info + * See comment above "struct start_info" in <xen/interface/xen.h> + */ + add_memory_region(__pa(xen_start_info->mfn_list), + xen_start_info->pt_base - xen_start_info->mfn_list, + E820_RESERVED); return "Xen"; }
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