linux-kernel - Re: [PATCHv3 1/8] x86/mm: Fix CR3_ADDR

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Date:   Fri, 10 Jun 2022 23:32:45 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hjl.tools@...il.com" <hjl.tools@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kcc@...gle.com" <kcc@...gle.com>,
        "andreyknvl@...il.com" <andreyknvl@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "ryabinin.a.a@...il.com" <ryabinin.a.a@...il.com>,
        "glider@...gle.com" <glider@...gle.com>
Subject: Re: [PATCHv3 1/8] x86/mm: Fix CR3_ADDR_MASK

On Fri, 2022-06-10 at 17:35 +0300, Kirill A. Shutemov wrote:
> The mask must not include bits above physical address mask. These
> bits
> are reserved and can be used for other things. Bits 61 and 62 are
> used
> for Linear Address Masking.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/x86/include/asm/processor-flags.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/processor-flags.h
> b/arch/x86/include/asm/processor-flags.h
> index 02c2cbda4a74..a7f3d9100adb 100644
> --- a/arch/x86/include/asm/processor-flags.h
> +++ b/arch/x86/include/asm/processor-flags.h
> @@ -35,7 +35,7 @@
>   */
>  #ifdef CONFIG_X86_64
>  /* Mask off the address space ID and SME encryption bits. */
> -#define CR3_ADDR_MASK	__sme_clr(0x7FFFFFFFFFFFF000ull)
> +#define CR3_ADDR_MASK	__sme_clr(PHYSICAL_PAGE_MASK)
>  #define CR3_PCID_MASK	0xFFFull
>  #define CR3_NOFLUSH	BIT_ULL(63)
>  

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>