在 2019年03月29日 18:39, Borislav Petkov 写道: > On Fri, Mar 29, 2019 at 02:56:48PM +0800, Lianbo Jiang wrote: >> When doing kexec_file_load(), the first kernel needs to pass the e820 >> reserved ranges to the second kernel, because some devices may use it >> in kdump kernel, such as PCI devices. >> >> But, the kernel can not exactly match the e820 reserved ranges when >> walking through the iomem resources via the 'IORES_DESC_NONE', because >> there are several types of e820 that are described as the 'IORES_DESC_NONE' >> type. Please refer to the e820_type_to_iores_desc(). >> >> Therefore, add a new I/O resource descriptor 'IORES_DESC_RESERVED' for >> the iomem resources search interfaces. It is helpful to exactly match >> the reserved resource ranges when walking through iomem resources. >> >> In addition, since the new descriptor 'IORES_DESC_RESERVED' has been >> created for the reserved areas, the code originally related to the >> descriptor 'IORES_DESC_NONE' also need to be updated. >> >> Suggested-by: Borislav Petkov <[email protected]> >> Signed-off-by: Lianbo Jiang <[email protected]> >> --- >> arch/x86/kernel/e820.c | 2 +- >> arch/x86/mm/ioremap.c | 16 ++++++++++++++-- >> include/linux/ioport.h | 1 + >> 3 files changed, 16 insertions(+), 3 deletions(-) >> >> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c >> index 2879e234e193..16fcde196243 100644 >> --- a/arch/x86/kernel/e820.c >> +++ b/arch/x86/kernel/e820.c >> @@ -1050,10 +1050,10 @@ static unsigned long __init >> e820_type_to_iores_desc(struct e820_entry *entry) >> case E820_TYPE_NVS: return IORES_DESC_ACPI_NV_STORAGE; >> case E820_TYPE_PMEM: return IORES_DESC_PERSISTENT_MEMORY; >> case E820_TYPE_PRAM: return >> IORES_DESC_PERSISTENT_MEMORY_LEGACY; >> + case E820_TYPE_RESERVED: return IORES_DESC_RESERVED; >> case E820_TYPE_RESERVED_KERN: /* Fall-through: */ >> case E820_TYPE_RAM: /* Fall-through: */ >> case E820_TYPE_UNUSABLE: /* Fall-through: */ >> - case E820_TYPE_RESERVED: /* Fall-through: */ >> default: return IORES_DESC_NONE; >> } >> } >> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c >> index 0029604af8a4..5671ec24df49 100644 >> --- a/arch/x86/mm/ioremap.c >> +++ b/arch/x86/mm/ioremap.c >> @@ -81,9 +81,21 @@ static bool __ioremap_check_ram(struct resource *res) >> return false; >> } >> >> -static int __ioremap_check_desc_other(struct resource *res) > > I can see this patch doesn't build even without applying and building > it. > > How about you build-test your stuff before submitting? > Oh, my God. I made a mistake when i copied the code from another machine. I will correct this issue and resend the patch v10.
Thanks. Lianbo _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
