On 09/21/18 at 03:32pm, Lianbo Jiang wrote: > E820 reserved ranges is useful in kdump kernel, we have added this in > kexec-tools code. > > One reason is PCI mmconf (extended mode) requires reserved region otherwise > it falls back to legacy mode. > > Furthermore, when AMD SME kdump support, it needs to map dmi table area as > unencrypted. For normal boot, these ranges sit in e820 reserved ranges, > thus the early ioremap code naturally map them as unencrypted. If we also > have same e820 reserve setup in kdump kernel then it will just work like > normal kernel. > > Kdump uses walk_iomem_res_desc to iterate resources, then adds matched desc > to e820 table for the kdump kernel. > > But IORES_DESC_NONE resource type includes several different e820 types, we > need add exact e820 type to the kdump kernel e820 table, thus it also needs > an extra checking in memmap_entry_callback() to match the e820 type and > resource name. > > By the way, we also fix an error which walks through iomem resources, the > values of the function parameter may be modified in the while loop of > __walk_iomem_res_desc(), which will cause us to not get the desired result > in some cases. > > Changes since v2: > 1. Modified the value of flags to "0", when walking through the whole > tree for e820 reserved ranges. > 2. Modified the invalid SOB chain issue. > > Lianbo Jiang (3): > resource: fix an error which walks through iomem resources > x86/kexec_file: add e820 entry in case e820 type string matches to io > resource name > x86/kexec_file: add reserved e820 ranges to kdump kernel e820 table Lianbo, since Bjorn has fixed the resource issue in another patchset, can you rebase your patch 2 and 3 on top of his patches and resend? > > arch/x86/include/asm/e820/api.h | 2 ++ > arch/x86/kernel/crash.c | 11 ++++++++++- > arch/x86/kernel/e820.c | 2 +- > kernel/resource.c | 3 +++ > 4 files changed, 16 insertions(+), 2 deletions(-) > > -- > 2.17.1 > Thanks Dave _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
