From: Dave Hansen <dave.hansen@intel.com>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>, x86@kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
chang.seok.bae@intel.com, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 00/10] x86: Allocate AVX512 xstate ondemand
Date: Thu, 2 Dec 2021 16:58:34 -0800 [thread overview]
Message-ID: <d7be6ef4-f73e-923e-93b7-ef254bf347c0@intel.com> (raw)
In-Reply-To: <27b6387f-fa93-484e-a56e-12452a82f069@www.fastmail.com>
On 12/2/21 4:45 PM, Jiaxun Yang wrote:
> 在2021年12月3日十二月 上午12:40，Dave Hansen写道：
>> On 12/2/21 4:36 PM, Jiaxun Yang wrote:
>>> Also we are going to have heterogeneous processors that
>>> only some cores support AVX512, it can be helpful when
>>> dealing with such processors.
>> Really? Which x86 vendor is doing that?
> Clear lower two bits of MSR 0xAF on Alder Lake give me some suprise :-)
I honestly don't know what you're talking about. Does poking that MSR
allowing AVX512 instructions to be executed on cores where it was
otherwise disabled? That's entertaining, but it's far from "supported"
or even support*able* in Linux.
next prev parent reply other threads:[~2021-12-03 0:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-03 0:36 [RFC PATCH 00/10] x86: Allocate AVX512 xstate ondemand Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 01/10] x86/fpu: Remove duplicated declaration of __fpu_state_size_dynamic Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 02/10] x86/fpu: Split fpu_xfd_enabled from fpu_state_size_dynamic Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 03/10] x86/fpu: Calculate xsave state addr on fly Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 04/10] x86/fpu: Remove xstate_comp_offsets cache Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 05/10] x86/fpu: Cache xstate_is_aligned Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 06/10] x86/fpu/xcr: Return all enabled xfeature if CPU doesn't support Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 07/10] x86/fpu: Rellocate fpstate on save_fpregs_to_fpstate Jiaxun Yang
2021-12-03 0:44 ` Dave Hansen
2021-12-03 11:39 ` Jiaxun Yang
2021-12-03 15:18 ` Dave Hansen
2021-12-03 15:51 ` Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 08/10] x86/fpu: Don't keep state_size in perm struct Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 09/10] x86/fpu: Split out XFEATURE_MASK_KERNEL_DYNAMIC Jiaxun Yang
2021-12-03 0:36 ` [RFC PATCH 10/10] x86/fpu: Mark AVX512 xfeatures as kernel dynamic Jiaxun Yang
2021-12-03 0:40 ` [RFC PATCH 00/10] x86: Allocate AVX512 xstate ondemand Dave Hansen
2021-12-03 0:45 ` Jiaxun Yang
2021-12-03 0:58 ` Dave Hansen [this message]
2021-12-03 9:20 ` David Laight
2021-12-03 11:42 ` Jiaxun Yang
2021-12-03 11:51 ` Borislav Petkov
2021-12-03 11:55 ` Jiaxun Yang
2021-12-04 11:55 ` Peter Zijlstra
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