From: Andy Lutomirski <luto@kernel.org>
To: Babu Moger <babu.moger@amd.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com,
peterz@infradead.org, shuah@kernel.org, jroedel@suse.de,
ubizjak@gmail.com, viro@zeniv.linux.org.uk,
jpa@git.mail.kapsi.fi, fenghua.yu@intel.com,
kan.liang@linux.intel.com, akpm@linux-foundation.org,
rppt@kernel.org, Fan_Yang@sjtu.edu.cn, anshuman.khandual@arm.com,
b.thiel@posteo.de, jgross@suse.com, keescook@chromium.org,
seanjc@google.com, mh@glandium.org, sashal@kernel.org,
krisman@collabora.com, chang.seok.bae@intel.com,
0x7f454c46@gmail.com, jhubbard@nvidia.com,
sandipan@linux.ibm.com, ziy@nvidia.com,
kirill.shutemov@linux.intel.com, suxingxing@loongson.cn,
harish@linux.ibm.com, rong.a.chen@intel.com, linuxram@us.ibm.com,
bauerman@linux.ibm.com, dave.kleikamp@oracle.com
Subject: Re: x86/fpu/xsave: protection key test failures
Date: Tue, 25 May 2021 17:36:18 -0700 [thread overview]
Message-ID: <a08f2575-af91-8b08-6286-be5ac80c67e5@kernel.org> (raw)
In-Reply-To: <b2e0324a-9125-bb34-9e76-81817df27c48@amd.com>
On 5/25/21 2:37 PM, Babu Moger wrote:
> Investigation so far.
> 1. The test fails on AMD(Milan) systems. Test appears to pass on Intel
> systems. Tested on old Intel system available here.
Ten cents says that you have discovered that AMD returns a synthesized
value for XINUSE[PKRU] and that write_pkru() is buggy.
Any volunteers to fix the if (!pk) case in write_pkru() and see if the
problem goes away? (Or at least to print something for the if (!pk)
case and seee if it gets printed?)
--Andy
next prev parent reply other threads:[~2021-05-26 0:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 21:37 x86/fpu/xsave: protection key test failures Babu Moger
2021-05-25 22:18 ` Dave Hansen
2021-05-25 22:22 ` Dave Kleikamp
2021-05-25 22:28 ` Dave Hansen
2021-05-26 0:03 ` Babu Moger
2021-05-26 0:20 ` Dave Hansen
2021-05-26 15:25 ` Babu Moger
2021-05-26 15:50 ` Dave Kleikamp
2021-05-26 16:06 ` Dave Hansen
2021-05-26 17:03 ` Babu Moger
2021-05-26 0:36 ` Andy Lutomirski [this message]
2021-05-26 21:14 ` Babu Moger
2021-05-26 21:17 ` Andy Lutomirski
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