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SubjectRe: [PATCH] x86/mm/ptdump: display page encryption state
On 4/19/22 07:35, Mike Rapoport wrote:
> When memory encryption is enabled, for instance in SEV guest, it is useful
> to see what memory ranges are mapped as encrypted in the kernel page tables
> and what ranges are left plain.
>
> Add printing of 'ENC' for the encrypted ranges to the page table dumps.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
> arch/x86/mm/dump_pagetables.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
> index e1b599ecbbc2..187dd17b8780 100644
> --- a/arch/x86/mm/dump_pagetables.c
> +++ b/arch/x86/mm/dump_pagetables.c
> @@ -201,6 +201,10 @@ static void printk_prot(struct seq_file *m, pgprotval_t pr, int level, bool dmsg
> pt_dump_cont_printf(m, dmsg, "PCD ");
> else
> pt_dump_cont_printf(m, dmsg, " ");
> + if (pr & _PAGE_ENC)
> + pt_dump_cont_printf(m, dmsg, "ENC ");
> + else
> + pt_dump_cont_printf(m, dmsg, " ");

_PAGE_ENC is AMD-specific. Could we do this with a new generic "cc_"
function, maybe cc_is_enc()?

Something like this would (I think) work for both SEV and TDX:

bool cc_is_enc(u64 prot)
{
return cc_mkdec(prot) != prot;
}

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