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 <bp@xxxxxxx>
> Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
> ---
> 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?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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