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xen-devel
[Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0 |
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From: |
"H. Peter Anvin" <hpa@xxxxxxxxx> |
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Date: |
Wed, 12 Oct 2011 14:31:50 -0700 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Tigran Aivazian <tigran@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Wed, 12 Oct 2011 14:33:22 -0700 |
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<20111012204048.GA22260@xxxxxxxxxxxxxxxxx> |
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References: |
<cover.1317060617.git.jeremy.fitzhardinge@xxxxxxxxxx> <4E94E1E5.4070505@xxxxxxxx> <20111012101615.GA14966@aftab> <4E95D9E7.6090304@xxxxxxxxx> <4E95E7FE.6050302@xxxxxxxx> <20111012194543.GD14966@aftab> <20111012204048.GA22260@xxxxxxxxxxxxxxxxx> |
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On 10/12/2011 01:40 PM, Konrad Rzeszutek Wilk wrote:
Why is it paramount to do it as early as possible? As in, even doing
it before Linux kernel is invoked is preferred than during initrd runtime?
It is paramount to do it as early as possible *because the CPU is
broken*. That's why there is a microcode update at all. It is
*supposed* to be installed by BIOS, but for whatever reason it wasn't
(including user doesn't want to update the BIOS), so the very fact that
this is done in the OS at all is a bit of a fail.
Doing it in the bootloader is messy because bootloaders typically aren't
SMP-aware (and really shouldn't need to be), which leaves the OS. On
native hardware it should ideally be done as early in the processor
bringup as possible.
-hpa
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- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Konrad Rzeszutek Wilk
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0,
H. Peter Anvin <=
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, H. Peter Anvin
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, H. Peter Anvin
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, H. Peter Anvin
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, Borislav Petkov
- [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0, H. Peter Anvin
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