Messages in this thread Patch in this message | | | Date | Thu, 29 May 2008 11:52:35 -0700 | From | "Yinghai Lu" <> | Subject | Re: [PATCH] x86: extend e820 ealy_res support 32bit - fix #2 |
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On Thu, May 29, 2008 at 6:37 AM, Jeremy Fitzhardinge <jeremy@goop.org> wrote: > 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)
it seems we miss to call sanitize_e820_map for 32 bit. we should get (early) Xen: 0000000000000000 - 000000000009f000 (usable) (early) Xen: 0000000000100000 - 00000000018aa000 (usable) (early) Xen: 00000000018aa000 - 00000000018ed000 (reserved) (early) Xen: 00000000018ed000 - 0000000010000000 (usable)
YH
> (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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