On Wed, Jul 13, 2022 at 1:13 AM Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > > Enumerate Linear Address Masking and provide defines for CR3 and CR4 > flags. > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx> Tested-by: Alexander Potapenko <glider@xxxxxxxxxx> > --- > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/uapi/asm/processor-flags.h | 6 ++++++ > 2 files changed, 7 insertions(+) > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index 03acc823838a..6ad5841e087f 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -300,6 +300,7 @@ > /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ > #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */ > #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ > +#define X86_FEATURE_LAM (12*32+26) /* Linear Address Masking */ > > /* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */ > #define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */ > diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h > index c47cc7f2feeb..d898432947ff 100644 > --- a/arch/x86/include/uapi/asm/processor-flags.h > +++ b/arch/x86/include/uapi/asm/processor-flags.h > @@ -82,6 +82,10 @@ > #define X86_CR3_PCID_BITS 12 > #define X86_CR3_PCID_MASK (_AC((1UL << X86_CR3_PCID_BITS) - 1, UL)) > > +#define X86_CR3_LAM_U57_BIT 61 /* Activate LAM for userspace, 62:57 bits masked */ > +#define X86_CR3_LAM_U57 _BITULL(X86_CR3_LAM_U57_BIT) > +#define X86_CR3_LAM_U48_BIT 62 /* Activate LAM for userspace, 62:48 bits masked */ > +#define X86_CR3_LAM_U48 _BITULL(X86_CR3_LAM_U48_BIT) > #define X86_CR3_PCID_NOFLUSH_BIT 63 /* Preserve old PCID */ > #define X86_CR3_PCID_NOFLUSH _BITULL(X86_CR3_PCID_NOFLUSH_BIT) > > @@ -132,6 +136,8 @@ > #define X86_CR4_PKE _BITUL(X86_CR4_PKE_BIT) > #define X86_CR4_CET_BIT 23 /* enable Control-flow Enforcement Technology */ > #define X86_CR4_CET _BITUL(X86_CR4_CET_BIT) > +#define X86_CR4_LAM_SUP_BIT 28 /* LAM for supervisor pointers */ > +#define X86_CR4_LAM_SUP _BITUL(X86_CR4_LAM_SUP_BIT) > > /* > * x86-64 Task Priority Register, CR8 > -- > 2.35.1 > -- Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Straße, 33 80636 München Geschäftsführer: Paul Manicle, Liana Sebastian Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg
