From: "Pavel Dovgalyuk" <dovgaluk@ispras.ru>
To: "'Dr. David Alan Gilbert'" <dgilbert@redhat.com>
Cc: 'Paolo Bonzini' <pbonzini@redhat.com>,
quintela@redhat.com, qemu-devel@nongnu.org, ehabkost@redhat.com,
rth@twiddle.net
Subject: Re: [Qemu-devel] i386: EFER vs 32-bit CPU
Date: Wed, 29 May 2019 17:03:06 +0300 [thread overview]
Message-ID: <004601d51627$3dd284c0$b9778e40$@ru> (raw)
In-Reply-To: <20190529123643.GF2882@work-vm>
> From: Dr. David Alan Gilbert [mailto:dgilbert@redhat.com]
> * Pavel Dovgalyuk (dovgaluk@ispras.ru) wrote:
> > > From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> > > On 29/05/19 13:30, Dr. David Alan Gilbert wrote:
> > > >> Should we add a section for i386, which duplicates efer, or just version_id of the main
> > > VMSD should
> > > >> be updated?
> > > >
> > > > You could do:
> > > >
> > > > #ifdef TARGET_X86_64
> > > > VMSTATE_UINT64(env.efer, X86CPU),
> > > > VMSTATE_UINT64(env.star, X86CPU),
> > > > ...
> > > >
> > > > to become:
> > > >
> > > > VMSTATE_UINT64_TEST(env.efer, X86CPU, efer_needed)
> > > > #ifdef TARGET_X86_64
> > > > VMSTATE_UINT64(env.star, X86CPU),
> > > >
> > > >
> > > > and then make efer_needed a function that returns true if
> > > > TARGET_X86_64 or it's a new machine type that knows about whatever
> > > > you're going to do with it.
> > >
> > > I prefer adding a subsection for 32-bit, so that EFER is saved/restored
> > > if nonzero.
> >
> > The question is: should we remove EFER from the original VMSD?
>
> No, because that would break 64bit compat.
Thanks. Already posted a patch here:
https://lists.gnu.org/archive/html/qemu-devel/2019-05/msg06796.html
Pavel Dovgalyuk
next prev parent reply other threads:[~2019-05-29 14:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 11:26 [Qemu-devel] i386: EFER vs 32-bit CPU Pavel Dovgalyuk
2019-05-29 11:30 ` Dr. David Alan Gilbert
2019-05-29 11:39 ` Paolo Bonzini
2019-05-29 11:53 ` Pavel Dovgalyuk
2019-05-29 12:36 ` Dr. David Alan Gilbert
2019-05-29 14:03 ` Pavel Dovgalyuk [this message]
2019-05-30 0:52 ` Peter Xu
2019-05-30 5:54 ` Pavel Dovgalyuk
2019-05-30 9:00 ` Peter Xu
2019-05-30 9:04 ` Peter Xu
2019-05-30 11:00 ` TeLeMan
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