Re: [PATCHv5 01/13] x86/mm: Fix CR3_ADDR_MASK

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On Wed, Jul 13, 2022 at 1:13 AM Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx>
> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Tested-by: Alexander Potapenko <glider@xxxxxxxxxx>

> ---
>  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)
>
> --
> 2.35.1
>


-- 
Alexander Potapenko
Software Engineer

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