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

[Tom Lendacky <thomas.lendacky@xxxxxxx>]

On 6/20/2017 11:17 AM, Andy Lutomirski wrote:
> 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?
Yup, will do.

Thanks,
Tom

>
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