Date: Thu, 5 Jul 2018 13:47:20 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Pete French <petefrench@ingresso.co.uk> Cc: avg@freebsd.org, eric@vangyzen.net, freebsd-stable@freebsd.org, freebsd@hda3.com, truckman@FreeBSD.org Subject: Re: Ryzen issues on FreeBSD ? (with sort of workaround) Message-ID: <20180705104720.GE5562@kib.kiev.ua> In-Reply-To: <E1fb1jV-0000yT-B2@dilbert.ingresso.co.uk> References: <20180705103135.GD5562@kib.kiev.ua> <E1fb1jV-0000yT-B2@dilbert.ingresso.co.uk>
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On Thu, Jul 05, 2018 at 11:43:29AM +0100, Pete French wrote: > > It does not make any sense to even try to access the chicken bits > > MSRs when running under virtualization. It is the duty of the > > hypervisor to configure hardware. > > I would tend to agree with you :-) I was kind of surprised to read that they > are actually saved and restored as part of a VM context switch in fact. Why do you state that they are saved/restored ? What is the evidence ? > > > I updated the patch. > > Thanks I shall try this now on my workstation and the Epyc virtual machine On VM the patch should be NOP, testing it is a waste of time IMO.
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