linux-stable.git/arch/x86/kernel/cpu/amd.c, branch linux-4.7.y

x86/AMD: Apply erratum 665 on machines without a BIOS fix

2016-09-24T08:09:29+00:00

commit d1992996753132e2dafe955cccb2fb0714d3cfc4 upstream.

AMD F12h machines have an erratum which can cause DIV/IDIV to behave
unpredictably. The workaround is to set MSRC001_1029[31] but sometimes
there is no BIOS update containing that workaround so let's do it
ourselves unconditionally. It is simple enough.

[ Borislav: Wrote commit message. ]

Signed-off-by: Emanuel Czirai 
Signed-off-by: Borislav Petkov 
Cc: Yaowu Xu 
Link: http://lkml.kernel.org/r/20160902053550.18097-1-bp@alien8.de
Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

x86/cpu/AMD: Extend X86_FEATURE_TOPOEXT workaround to newer models

2016-06-08T11:51:34+00:00

We need to reenable the topology extensions CPUID leafs on newer models
too, if BIOS has disabled them, as we rely on them to get proper compute
unit topology.

Make the printk a once thing, while at it.

Signed-off-by: Borislav Petkov 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Denys Vlasenko 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Rui Huang 
Cc: Sherry Hurwitz 
Cc: Thomas Gleixner 
Cc: linux-hwmon@vger.kernel.org
Link: http://lkml.kernel.org/r/1464775468-23355-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar

x86/cpu: Simplify extended APIC ID detection on AMD

2016-04-13T09:37:42+00:00

Both if-branches are under if (boot_cpu_has(X86_FEATURE_APIC)), unify
them.

Also, simplify the test for bits:

- 17 ("ApicExtBrdCst: APIC extended broadcast enable") and
- 18 ("ApicExtId: APIC extended ID enable.")

in "D18F0x68 Link Transaction Control."

No functionality change.

Signed-off-by: Borislav Petkov 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Denys Vlasenko 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1459837795-2588-3-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar

x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage

2016-04-13T09:37:41+00:00

Signed-off-by: Borislav Petkov 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Denys Vlasenko 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: iommu@lists.linux-foundation.org
Cc: linux-pm@vger.kernel.org
Cc: oprofile-list@lists.sf.net
Link: http://lkml.kernel.org/r/1459801503-15600-8-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar

Merge branch 'x86/urgent' into x86/asm to pick up dependent fixes

2016-04-13T09:36:44+00:00

Signed-off-by: Ingo Molnar

Merge branch 'x86/cpu' into x86/asm, to merge more patches

2016-04-13T09:15:39+00:00

Signed-off-by: Ingo Molnar

x86/cpu: Add Erratum 88 detection on AMD

2016-04-13T08:20:42+00:00

Erratum 88 affects old AMD K8s, where a SWAPGS fails to cause an input
dependency on GS. Therefore, we need to MFENCE before it.

But that MFENCE is expensive and unnecessary on the remaining x86 CPUs
out there so patch it out on the CPUs which don't require it.

Signed-off-by: Borislav Petkov 
Signed-off-by: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Denys Vlasenko 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Rudolf Marek 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/aec6b2df1bfc56101d4e9e2e5d5d570bf41663c6.1460075211.git.luto@kernel.org
Signed-off-by: Ingo Molnar

x86/cpufeature: Remove cpu_has_xmm2

2016-03-31T11:35:09+00:00

Signed-off-by: Borislav Petkov 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-crypto@vger.kernel.org
Link: http://lkml.kernel.org/r/1459266123-21878-8-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar

x86/cpu: Get rid of compute_unit_id

2016-03-29T08:45:04+00:00

It is cpu_core_id anyway.

Signed-off-by: Borislav Petkov 
Link: http://lkml.kernel.org/r/1458917557-8757-3-git-send-email-bp@alien8.de
Signed-off-by: Thomas Gleixner

x86/topology: Fix AMD core count

2016-03-29T08:45:04+00:00

It turns out AMD gets x86_max_cores wrong when there are compute
units.

The issue is that Linux assumes:

	nr_logical_cpus = nr_cores * nr_siblings

But AMD reports its CU unit as 2 cores, but then sets num_smp_siblings
to 2 as well.

Boris: fixup ras/mce_amd_inj.c too, to compute the Node Base Core
properly, according to the new nomenclature.

Fixes: 1f12e32f4cd5 ("x86/topology: Create logical package id")
Reported-by: Xiong Zhou 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Borislav Petkov 
Cc: Andreas Herrmann 
Cc: Andy Lutomirski 
Link: http://lkml.kernel.org/r/20160317095220.GO6344@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner