Re: [PATCH v3 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT

[Binbin Wu]

On 9/19/2025 7:22 AM, Rick Edgecombe wrote:
[...]
> diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
> index 38dae825bbb9..4e4aa8927550 100644
> --- a/arch/x86/virt/vmx/tdx/tdx.c
> +++ b/arch/x86/virt/vmx/tdx/tdx.c
> @@ -440,6 +440,18 @@ static int fill_out_tdmrs(struct list_head *tmb_list,
>   	return 0;
>   }
>   
> +static unsigned long tdmr_get_pamt_bitmap_sz(struct tdmr_info *tdmr)
> +{
> +	unsigned long pamt_sz, nr_pamt_entries;
> +	int bits_per_entry;
> +
> +	bits_per_entry = tdx_sysinfo.tdmr.pamt_page_bitmap_entry_bits;
> +	nr_pamt_entries = tdmr->size >> PAGE_SHIFT;
> +	pamt_sz = DIV_ROUND_UP(nr_pamt_entries * bits_per_entry, BITS_PER_BYTE);
> +
> +	return ALIGN(pamt_sz, PAGE_SIZE);

Nit:
return PAGE_ALIGN(pamt_sz);