From: "Woodhouse, David" <dwmw@amazon.co.uk>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tim.c.chen@linux.intel.com" <tim.c.chen@linux.intel.com>,
"arjan@linux.intel.com" <arjan@linux.intel.com>,
"Raslan, KarimAllah" <karahmed@amazon.de>,
"peterz@infradead.org" <peterz@infradead.org>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"bp@alien8.de" <bp@alien8.de>,
"dave.hansen@intel.com" <dave.hansen@intel.com>,
"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
"gregkh@linux-foundation.org" <gregkh@linux-foundation.org>
Subject: Re: [PATCH v2 5/5] x86/pti: Do not enable PTI on fixed Intel processors
Date: Tue, 23 Jan 2018 18:44:49 +0000 [thread overview]
Message-ID: <1516733089.9521.162.camel@amazon.co.uk> (raw)
In-Reply-To: <736fa9c9-d651-b6ef-802c-d02a27c28ab9@intel.com>
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On Tue, 2018-01-23 at 10:41 -0800, Dave Hansen wrote:
> On 01/23/2018 08:52 AM, David Woodhouse wrote:
> > When they advertise the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_NO
> > bit set, they don't need KPTI either.
>
> Also, I hate to ask... Have you tested this patch?
Nope. I deliberately haven't implemented IBRS_ALL because I have no
suitable hardware for that and there are some non-trivial parts, but
this one really *should* be trivial so seemed OK to do without
hardware.
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Amazon Web Services UK Limited. Registered in England and Wales with registration number 08650665 and which has its registered office at 60 Holborn Viaduct, London EC1A 2FD, United Kingdom.
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next prev parent reply other threads:[~2018-01-23 18:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 16:52 [PATCH v2 0/5] Basic Speculation Control feature support David Woodhouse
2018-01-23 16:52 ` [PATCH v2 1/5] x86/cpufeatures: Add CPUID_7_EDX CPUID leaf David Woodhouse
2018-01-23 16:52 ` [PATCH v2 2/5] x86/cpufeatures: Add Intel feature bits for Speculation Control David Woodhouse
2018-01-23 18:43 ` Dave Hansen
2018-01-24 1:23 ` Woodhouse, David
2018-01-24 1:28 ` Dave Hansen
2018-01-24 8:13 ` Woodhouse, David
2018-01-23 16:52 ` [PATCH v2 3/5] x86/cpufeatures: Add AMD " David Woodhouse
2018-01-24 8:39 ` Kirill A. Shutemov
2018-01-24 8:40 ` David Woodhouse
2018-01-23 16:52 ` [PATCH v2 4/5] x86/msr: Add definitions for new speculation control MSRs David Woodhouse
2018-01-23 18:27 ` Dave Hansen
2018-01-23 18:31 ` Greg KH
2018-01-23 18:48 ` Woodhouse, David
2018-01-23 16:52 ` [PATCH v2 5/5] x86/pti: Do not enable PTI on fixed Intel processors David Woodhouse
2018-01-23 18:12 ` Andi Kleen
2018-01-24 1:21 ` David Woodhouse
2018-01-23 18:40 ` Dave Hansen
2018-01-24 1:27 ` David Woodhouse
2018-01-23 18:41 ` Dave Hansen
2018-01-23 18:44 ` Woodhouse, David [this message]
2018-01-23 18:45 ` Alan Cox
2018-01-23 19:02 ` Andrew Cooper
2018-01-23 20:45 ` Alan Cox
2018-01-23 20:38 ` Linus Torvalds
2018-01-23 20:50 ` David Woodhouse
2018-01-24 16:25 ` David Woodhouse
2018-01-24 17:07 ` Alan Cox
2018-01-24 17:42 ` David Woodhouse
2018-01-24 18:40 ` Alan Cox
2018-01-24 18:59 ` David Woodhouse
2018-01-24 19:37 ` David Woodhouse
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