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

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Message-ID: <90fdfc53-ad71-44f8-846b-dd3f859331dc@linux.intel.com>
Date: Tue, 23 Sep 2025 15:15:46 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: kas@...nel.org, bp@...en8.de, chao.gao@...el.com,
 dave.hansen@...ux.intel.com, isaku.yamahata@...el.com, kai.huang@...el.com,
 kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, mingo@...hat.com, pbonzini@...hat.com,
 seanjc@...gle.com, tglx@...utronix.de, x86@...nel.org, yan.y.zhao@...el.com,
 vannapurve@...gle.com, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v3 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic
 PAMT

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);