Re: [Xen-devel] [PATCH v7 11/36] x86/mm: Add SME support for read_cr3_pa()

[Andy Lutomirski <luto@xxxxxxxxxx>]

On Fri, Jun 16, 2017 at 11:51 AM, Tom Lendacky <thomas.lendacky@xxxxxxx> wrote:
> The cr3 register entry can contain the SME encryption mask that indicates
> the PGD is encrypted.  The encryption mask should not be used when
> creating a virtual address from the cr3 register, so remove the SME
> encryption mask in the read_cr3_pa() function.
>
> During early boot SME will need to use a native version of read_cr3_pa(),
> so create native_read_cr3_pa().
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
>  arch/x86/include/asm/processor-flags.h |    3 ++-
>  arch/x86/include/asm/processor.h       |    5 +++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/processor-flags.h 
> b/arch/x86/include/asm/processor-flags.h
> index 79aa2f9..cb6999c 100644
> --- a/arch/x86/include/asm/processor-flags.h
> +++ b/arch/x86/include/asm/processor-flags.h
> @@ -2,6 +2,7 @@
>  #define _ASM_X86_PROCESSOR_FLAGS_H
>
>  #include <uapi/asm/processor-flags.h>
> +#include <linux/mem_encrypt.h>
>
>  #ifdef CONFIG_VM86
>  #define X86_VM_MASK    X86_EFLAGS_VM
> @@ -33,7 +34,7 @@
>   */
>  #ifdef CONFIG_X86_64
>  /* Mask off the address space ID bits. */
> -#define CR3_ADDR_MASK 0x7FFFFFFFFFFFF000ull
> +#define CR3_ADDR_MASK __sme_clr(0x7FFFFFFFFFFFF000ull)

Can you update the comment one line above, too?

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