On 17/01/2018 18:21, Tom Lendacky wrote:
> On 1/8/2018 11:01 AM, Paolo Bonzini wrote:
>> On 08/01/2018 17:48, Dr. David Alan Gilbert wrote:
If your hypervisor is lying to you about the primary family, then all
bets are off. I don't expect there will be any production systems doing
t
On 1/8/2018 11:01 AM, Paolo Bonzini wrote:
> On 08/01/2018 17:48, Dr. David Alan Gilbert wrote:
>>> If your hypervisor is lying to you about the primary family, then all
>>> bets are off. I don't expect there will be any production systems doing
>>> this.
>> It's not that an unusual thing to do on
On Mon, 8 Jan 2018, Tom Lendacky wrote:
> So now I'm also concerned about setting the retpoline method and using
> LFENCE as the speculation barrier. If we go back to the original
> statement:
>
> - the hypervisor did not set the LFENCE to serializing on the host
> - the hypervisor does not a
On 08/01/2018 18:39, Tom Lendacky wrote:
> On 1/8/2018 11:01 AM, Paolo Bonzini wrote:
>> On 08/01/2018 17:48, Dr. David Alan Gilbert wrote:
If your hypervisor is lying to you about the primary family, then all
bets are off. I don't expect there will be any production systems doing
t
On 1/8/2018 11:01 AM, Paolo Bonzini wrote:
> On 08/01/2018 17:48, Dr. David Alan Gilbert wrote:
>>> If your hypervisor is lying to you about the primary family, then all
>>> bets are off. I don't expect there will be any production systems doing
>>> this.
>> It's not that an unusual thing to do on
On 1/8/2018 9:15 AM, Thomas Gleixner wrote:
> On Mon, 8 Jan 2018, Tom Lendacky wrote:
>> On 1/8/2018 5:10 AM, Thomas Gleixner wrote:
> Second thoughts on that. As pointed out by someone in one of the insane
> long threads:
>
> What happens if the kernel runs as a guest and
>
>>>
On 08/01/2018 17:48, Dr. David Alan Gilbert wrote:
>> If your hypervisor is lying to you about the primary family, then all
>> bets are off. I don't expect there will be any production systems doing
>> this.
> It's not that an unusual thing to do on qemu/kvm - to specify the lowest
> common denomi
* Andrew Cooper (andrew.coop...@citrix.com) wrote:
> On 08/01/18 14:47, Tom Lendacky wrote:
> > On 1/8/2018 5:10 AM, Thomas Gleixner wrote:
> >> On Mon, 8 Jan 2018, Andrew Cooper wrote:
> >>
> >>> On 08/01/18 10:08, Thomas Gleixner wrote:
> On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
>
On 08/01/18 14:47, Tom Lendacky wrote:
> On 1/8/2018 5:10 AM, Thomas Gleixner wrote:
>> On Mon, 8 Jan 2018, Andrew Cooper wrote:
>>
>>> On 08/01/18 10:08, Thomas Gleixner wrote:
On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
> Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
On Mon, 8 Jan 2018, Tom Lendacky wrote:
> On 1/8/2018 5:10 AM, Thomas Gleixner wrote:
> >>> Second thoughts on that. As pointed out by someone in one of the insane
> >>> long threads:
> >>>
> >>> What happens if the kernel runs as a guest and
> >>>
> >>> - the hypervisor did not set the LFENCE to
> Ok, I can add the read-back check before setting the feature flag(s).
>
> But... what about the case where the guest is a different family than
> hypervisor? If we're on, say, a Fam15h hypervisor but the guest is started
> as a Fam0fh guest where the MSR doesn't exist and LFENCE is supposed to b
On 1/8/2018 5:10 AM, Thomas Gleixner wrote:
> On Mon, 8 Jan 2018, Andrew Cooper wrote:
>
>> On 08/01/18 10:08, Thomas Gleixner wrote:
>>> On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
>>>
Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
Gitweb:
https://git.kernel.org/
On Mon, 8 Jan 2018, Andrew Cooper wrote:
> On 08/01/18 10:08, Thomas Gleixner wrote:
> > On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
> >
> >> Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
> >> Gitweb:
> >> https://git.kernel.org/tip/0bf17c102177d5da9363bf8b1e4704b9996d5079
> >>
On 08/01/18 10:08, Thomas Gleixner wrote:
> On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
>
>> Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
>> Gitweb:
>> https://git.kernel.org/tip/0bf17c102177d5da9363bf8b1e4704b9996d5079
>> Author: Tom Lendacky
>> AuthorDate: Fri, 5 Jan 201
On Mon, 8 Jan 2018, Woodhouse, David wrote:
> On Mon, 2018-01-08 at 11:08 +0100, Thomas Gleixner wrote:
> > I'm dropping these patches until this question is answered.
>
> I've rebased my retpoline tree on top of tip/x86/pti from before those
> patches (from my BUG_SPECTRE_Vx patch).
That's not
On Mon, 2018-01-08 at 11:08 +0100, Thomas Gleixner wrote:
> I'm dropping these patches until this question is answered.
I've rebased my retpoline tree on top of tip/x86/pti from before those
patches (from my BUG_SPECTRE_Vx patch).
smime.p7s
Description: S/MIME cryptographic signature
On Sat, 6 Jan 2018, tip-bot for Tom Lendacky wrote:
> Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
> Gitweb:
> https://git.kernel.org/tip/0bf17c102177d5da9363bf8b1e4704b9996d5079
> Author: Tom Lendacky
> AuthorDate: Fri, 5 Jan 2018 10:07:56 -0600
> Committer: Thomas Gleixner
>
Commit-ID: 0bf17c102177d5da9363bf8b1e4704b9996d5079
Gitweb: https://git.kernel.org/tip/0bf17c102177d5da9363bf8b1e4704b9996d5079
Author: Tom Lendacky
AuthorDate: Fri, 5 Jan 2018 10:07:56 -0600
Committer: Thomas Gleixner
CommitDate: Sat, 6 Jan 2018 21:57:40 +0100
x86/cpu/AMD: Use LFENCE_
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