Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: Rewording of Setting IA32_XFD[18] (Re: Thoughts of AMX KVM support based on latest kernel) | Date | Fri, 10 Dec 2021 22:53:37 +0100 |
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Jun,
On Wed, Dec 08 2021 at 00:50, Jun Nakajima wrote: >> On Nov 19, 2021, at 7:41 AM, Nakajima, Jun <jun.nakajima@intel.com> wrote: >> I’ll work with the H/W team on those (i.e. rewording and the component 17 issue). >> > > The following is a possible documentation update that may convey the > rewording you requested. Does this (the last sentence, “In addition, > “) work for you? > > 3.3 RECOMMENDATIONS FOR SYSTEM SOFTWARE > > System software may disable use of Intel AMX by clearing XCR0[18:17], > by clearing CR4.OSXSAVE, or by setting IA32_XFD[18]. System software > should initialize AMX state (e.g., by executing TILERELEASE) when > doing so because maintaining AMX state in a non-initialized state may > have negative power and performance implications. In addition, > software should not rely on the state of the tile data after setting > IA32_XFD[18]; software should always reload or reinitialize the tile > data after clearing IA32_XFD[18].
looks good to me.
Thanks,
tglx
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