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SubjectRe: [PATCH 2/5 V6] x86/ioremap: strengthen the logic in early_memremap_pgprot_adjust() to adjust encryption mask
On 08/31/18 at 04:19pm, Lianbo Jiang wrote:
> For kdump kernel, when SME is enabled, the acpi table and dmi table will need
> to be remapped without the memory encryption mask. So we have to strengthen
> the logic in early_memremap_pgprot_adjust(), which makes us have an opportunity
> to adjust the memory encryption mask.
>
> Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
> ---
> arch/x86/mm/ioremap.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index e01e6c695add..f9d9a39955f3 100644
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -689,8 +689,15 @@ pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
> encrypted_prot = true;
>
> if (sme_active()) {
> + /*
> + * In kdump kernel, the acpi table and dmi table will need
> + * to be remapped without the memory encryption mask. Here
> + * we have to strengthen the logic to adjust the memory
> + * encryption mask.

Assume the acpi/dmi tables are identical for both 1st kernel and kdump
kernel, I'm not sure what is the difference, why need special handling
for kdump. Can you add more explanations?

> + */
> if (early_memremap_is_setup_data(phys_addr, size) ||
> - memremap_is_efi_data(phys_addr, size))
> + memremap_is_efi_data(phys_addr, size) ||
> + is_kdump_kernel())
> encrypted_prot = false;
> }
>
> --
> 2.17.1
>

Thanks
Dave

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