linux-kernel - Re: retbleed on hygon

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Date:   Fri, 22 Jul 2022 13:34:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wen Pu <puwen@...on.cn>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: retbleed on hygon

On Fri, Jul 22, 2022 at 11:17:19AM +0000, Wen Pu wrote:
> On 2022/7/18 21:33, Peter Zijlstra wrote:
> > On Mon, Jul 18, 2022 at 01:03:41PM +0000, Wen Pu wrote:
> >> On 2022/7/18 19:44, Peter Zijlstra wrote:
> >>> Hi Pu Wen,
> >>>
> >>> Now that retbleed is public could you please review the patches in
> >>> question and clarify the situation vs Hygon please? For development I've
> >>> assumed Hygon is basically Zen1 wrt this issue.
> >>
> >> Hi Peter,
> >>
> >> I'm sorry that there is something wrong with my email these days, so I
> >> haven't received the patches. Do you mean those with "[peterz: add
> >> hygon]" added by you? Thanks a lot for taking Hygon into account. I'll
> >> clarify it as soon as possible.
> > 
> > It's not your email, it was a hardware embargo issue so these patches
> > have never been mailed out before hitting Linus' tree :-/
> > 
> > Please double check the entire series, see the merge commit:
> > 
> >    ce114c866860 ("Merge tag 'x86_bugs_retbleed' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
> > 
> > But in specific pay attention to commits:
> > 
> >    a149180fbcf336e97ce4eb2cdc13672727feb94d
> >    6b80b59b3555706508008f1f127b5412c89c7fd8
> >    3ebc170068885b6fc7bedda6c667bb2c4d533159
> >    d7caac991feeef1b871ee6988fd2c9725df09039
> >    26aae8ccbc1972233afd08fb3f368947c0314265
> > 
> > Basically everything that has HYGON in it. For that first commit, double
> > check with your hardware folks the mitigation actually works for Hygon
> > too. For the other commits validate it DTRT wrt HYGON. Please also send
> 
> We have checked and confirmed the mitigation works for Hygon, so these
> entire series practically DTRT for Hygon. Thanks a lot :)

You're welcome!