linux-kernel - Re: [PATCH 01/17] x86: spec_ctrl: fix SPEC

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Message-ID: <20190923153057.GA18195@linux.intel.com>
Date:   Mon, 23 Sep 2019 08:30:57 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/17] x86: spec_ctrl: fix SPEC_CTRL initialization after
 kexec

On Mon, Sep 23, 2019 at 12:22:23PM +0200, Paolo Bonzini wrote:
> On 20/09/19 23:24, Andrea Arcangeli wrote:
> > We can't assume the SPEC_CTRL msr is zero at boot because it could be
> > left enabled by a previous kernel booted with
> > spec_store_bypass_disable=on.
> > 
> > Without this fix a boot with spec_store_bypass_disable=on followed by
> > a kexec boot with spec_store_bypass_disable=off would erroneously and
> > unexpectedly leave bit 2 set in SPEC_CTRL.
> > 
> > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> 
> Can you send this out separately, so that Thomas et al. can pick it up
> as a bug fix?

Can all off the patches that are not directly related to the monolithic
conversion be sent separately?  AFAICT, patches 01, 03, 07, 08, 14, 15, 16
and 17 are not required or dependent on the conversion to a monolithic
module.  That's almost half the series...