On 4/7/22 08:27, Kirill A. Shutemov wrote:
The fast path does not clear the bits, so you enter the slow path before you
get to clearing the bits. You've lost most of the advantage of the tlb
already.
Sorry for my ignorance, but what do you mean by fast path here?
My understanding is that it
On Thu, Apr 07, 2022 at 06:38:40PM +0200, Paolo Bonzini wrote:
> On 4/7/22 17:27, Kirill A. Shutemov wrote:
> > On Thu, Apr 07, 2022 at 07:28:54AM -0700, Richard Henderson wrote:
> > > On 4/7/22 06:18, Kirill A. Shutemov wrote:
> > > > > The new hook is incorrect, in that it doesn't apply to
On 4/7/22 17:27, Kirill A. Shutemov wrote:
On Thu, Apr 07, 2022 at 07:28:54AM -0700, Richard Henderson wrote:
On 4/7/22 06:18, Kirill A. Shutemov wrote:
The new hook is incorrect, in that it doesn't apply to addresses along
the tlb fast path.
I'm not sure what you mean by that. tlb_hit()
On Thu, Apr 07, 2022 at 07:28:54AM -0700, Richard Henderson wrote:
> On 4/7/22 06:18, Kirill A. Shutemov wrote:
> > > The new hook is incorrect, in that it doesn't apply to addresses along
> > > the tlb fast path.
> >
> > I'm not sure what you mean by that. tlb_hit() mechanics works. We strip
> >
On 4/7/22 06:18, Kirill A. Shutemov wrote:
The new hook is incorrect, in that it doesn't apply to addresses along
the tlb fast path.
I'm not sure what you mean by that. tlb_hit() mechanics works. We strip
the tag bits before tlb lookup.
Could you elaborate?
The fast path does not clear the
On Wed, Apr 06, 2022 at 10:34:41PM -0500, Richard Henderson wrote:
> On 4/6/22 20:01, Kirill A. Shutemov wrote:
> > Linear Address Masking feature makes CPU ignore some bits of the virtual
> > address. These bits can be used to encode metadata.
> >
> > The feature is enumerated with
On 4/6/22 20:01, Kirill A. Shutemov wrote:
Linear Address Masking feature makes CPU ignore some bits of the virtual
address. These bits can be used to encode metadata.
The feature is enumerated with CPUID.(EAX=07H, ECX=01H):EAX.LAM[bit 26].
CR3.LAM_U57[bit 62] allows to encode 6 bits of
Linear Address Masking feature makes CPU ignore some bits of the virtual
address. These bits can be used to encode metadata.
The feature is enumerated with CPUID.(EAX=07H, ECX=01H):EAX.LAM[bit 26].
CR3.LAM_U57[bit 62] allows to encode 6 bits of metadata in bits 62:57 of
user pointers.
