linux-kernel - Re: [PATCH v2 13/21] x86/virt/tdx: Allocate and set up PAMTs for TDMRs

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Message-ID: <20220324180648.GB1212881@ls.amr.corp.intel.com>
Date:   Thu, 24 Mar 2022 11:06:48 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        dave.hansen@...el.com, seanjc@...gle.com, pbonzini@...hat.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, peterz@...radead.org,
        tony.luck@...el.com, ak@...ux.intel.com, dan.j.williams@...el.com,
        isaku.yamahata@...el.com, isaku.yamahata@...il.com
Subject: Re: [PATCH v2 13/21] x86/virt/tdx: Allocate and set up PAMTs for
 TDMRs

On Sun, Mar 13, 2022 at 11:49:53PM +1300,
Kai Huang <kai.huang@...el.com> wrote:

> diff --git a/arch/x86/virt/vmx/tdx.c b/arch/x86/virt/vmx/tdx.c
> index 1939b64d23e8..c58c99b94c72 100644
> --- a/arch/x86/virt/vmx/tdx.c
> +++ b/arch/x86/virt/vmx/tdx.c
> @@ -21,6 +21,7 @@
>  #include <asm/cpufeatures.h>
>  #include <asm/virtext.h>
>  #include <asm/e820/api.h>
> +#include <asm/pgtable.h>
>  #include <asm/tdx.h>
>  #include "tdx.h"
>  
> @@ -66,6 +67,16 @@
>  #define TDMR_START(_tdmr)	((_tdmr)->base)
>  #define TDMR_END(_tdmr)		((_tdmr)->base + (_tdmr)->size)
>  
> +/* Page sizes supported by TDX */
> +enum tdx_page_sz {
> +	TDX_PG_4K = 0,
> +	TDX_PG_2M,
> +	TDX_PG_1G,
> +	TDX_PG_MAX,
> +};
> +
> +#define TDX_HPAGE_SHIFT	9
> +
>  /*
>   * TDX module status during initialization
>   */
> @@ -893,7 +904,7 @@ static int create_tdmrs(struct tdmr_info **tdmr_array, int *tdmr_num)
>  	 * them.  To keep it simple, always try to use one TDMR to cover
>  	 * one RAM entry.
>  	 */
> -	e820_for_each_mem(e820_table, i, start, end) {
> +	e820_for_each_mem(i, start, end) {

This patch doesn't change e820_for_each_mem.  This hunk should go into the
previous patch?

thansk,

-- 
Isaku Yamahata <isaku.yamahata@...il.com>