From: Liran Alon <liran.alon@oracle.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>,
kvm list <kvm@vger.kernel.org>,
mtosatti@redhat.com,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
qemu-devel@nongnu.org, Jim Mattson <jmattson@google.com>,
rth@twiddle.net
Subject: Re: [QEMU PATCH v2 0/2]: KVM: i386: Add support for save and restore nested state
Date: Thu, 8 Nov 2018 11:57:46 +0200 [thread overview]
Message-ID: <939A6255-306C-431C-8799-0D56A30A3BD5@oracle.com> (raw)
In-Reply-To: <a567de11-a106-fd6d-7998-1a18ba17eaaa@redhat.com>
> On 8 Nov 2018, at 11:50, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 08/11/2018 01:45, Jim Mattson wrote:
>> I have no attachments to the current design. I had used a data[] blob,
>> because I didn't think userspace would have any need to know what was
>> in there. However, I am now seeing the error of my ways. For example,
>> the userspace instruction emulator needs to know the contents of the
>> vmcs12 to emulate instructions when in guest mode.
>
> Yeah, we're probably going to have to document the KVM vmcs12 structure,
> possibly moving it to uapi. But that's a different thing from
> save/restore state, which can use the 4K or 8K data[] blob.
>
> Paolo
But regardless of if we document vmcs12 or not, the current blob we have today
should be separated to well-defined blobs/structs (cached_vmcs12 and cached_shadow_vmcs12)
and each blob should have a relevant flag that specifies it is valid (saved by kernel or requested to be restored by userspace).
Additional future nested-state should be added as additional well-defined blobs/structs with appropriate flags.
Then, in QEMU, each such well-defined blob/struct should have it’s own subsection with a relevant .needed() method.
This will allow us to preserve required backwards compatibility.
Agreed?
-Liran
WARNING: multiple messages have this Message-ID (diff)
From: Liran Alon <liran.alon@oracle.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jim Mattson <jmattson@google.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
kvm list <kvm@vger.kernel.org>,
mtosatti@redhat.com, rth@twiddle.net, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [QEMU PATCH v2 0/2]: KVM: i386: Add support for save and restore nested state
Date: Thu, 8 Nov 2018 11:57:46 +0200 [thread overview]
Message-ID: <939A6255-306C-431C-8799-0D56A30A3BD5@oracle.com> (raw)
In-Reply-To: <a567de11-a106-fd6d-7998-1a18ba17eaaa@redhat.com>
> On 8 Nov 2018, at 11:50, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 08/11/2018 01:45, Jim Mattson wrote:
>> I have no attachments to the current design. I had used a data[] blob,
>> because I didn't think userspace would have any need to know what was
>> in there. However, I am now seeing the error of my ways. For example,
>> the userspace instruction emulator needs to know the contents of the
>> vmcs12 to emulate instructions when in guest mode.
>
> Yeah, we're probably going to have to document the KVM vmcs12 structure,
> possibly moving it to uapi. But that's a different thing from
> save/restore state, which can use the 4K or 8K data[] blob.
>
> Paolo
But regardless of if we document vmcs12 or not, the current blob we have today
should be separated to well-defined blobs/structs (cached_vmcs12 and cached_shadow_vmcs12)
and each blob should have a relevant flag that specifies it is valid (saved by kernel or requested to be restored by userspace).
Additional future nested-state should be added as additional well-defined blobs/structs with appropriate flags.
Then, in QEMU, each such well-defined blob/struct should have it’s own subsection with a relevant .needed() method.
This will allow us to preserve required backwards compatibility.
Agreed?
-Liran
next prev parent reply other threads:[~2018-11-08 9:57 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-16 12:46 [QEMU PATCH v2 0/2]: KVM: i386: Add support for save and restore nested state Liran Alon
2018-09-16 12:46 ` [Qemu-devel] " Liran Alon
2018-09-16 12:46 ` [QEMU PATCH v2 1/2] i386: Compile CPUX86State xsave_buf only when support KVM or HVF Liran Alon
2018-09-16 12:46 ` [Qemu-devel] " Liran Alon
2018-09-16 12:46 ` [QEMU PATCH v2 2/2] KVM: i386: Add support for save and restore nested state Liran Alon
2018-09-16 12:46 ` [Qemu-devel] " Liran Alon
2018-10-08 17:21 ` [QEMU PATCH v2 0/2]: " Liran Alon
2018-10-08 17:21 ` [Qemu-devel] " Liran Alon
2018-10-15 18:10 ` Liran Alon
2018-10-15 18:10 ` [Qemu-devel] " Liran Alon
2018-10-31 1:03 ` Liran Alon
2018-10-31 1:03 ` [Qemu-devel] " Liran Alon
2018-10-31 18:17 ` Eduardo Habkost
2018-10-31 18:17 ` [Qemu-devel] " Eduardo Habkost
2018-10-31 18:19 ` Paolo Bonzini
2018-10-31 18:19 ` [Qemu-devel] " Paolo Bonzini
2018-10-31 18:50 ` Liran Alon
2018-10-31 18:50 ` [Qemu-devel] " Liran Alon
2018-10-31 18:59 ` Dr. David Alan Gilbert
2018-10-31 18:59 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-10-31 23:17 ` Liran Alon
2018-10-31 23:17 ` [Qemu-devel] " Liran Alon
2018-11-01 13:10 ` Dr. David Alan Gilbert
2018-11-01 13:10 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-01 15:23 ` Liran Alon
2018-11-01 15:23 ` [Qemu-devel] " Liran Alon
2018-11-01 15:56 ` Dr. David Alan Gilbert
2018-11-01 15:56 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-01 16:45 ` Jim Mattson via Qemu-devel
2018-11-01 16:45 ` [Qemu-devel] " Jim Mattson
2018-11-02 3:46 ` Liran Alon
2018-11-02 3:46 ` [Qemu-devel] " Liran Alon
2018-11-02 9:40 ` Paolo Bonzini
2018-11-02 9:40 ` [Qemu-devel] " Paolo Bonzini
2018-11-02 12:35 ` Dr. David Alan Gilbert
2018-11-02 12:35 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-02 12:40 ` Daniel P. Berrangé
2018-11-02 12:40 ` [Qemu-devel] " Daniel P. Berrangé
2018-11-04 22:12 ` Paolo Bonzini
2018-11-04 22:12 ` [Qemu-devel] " Paolo Bonzini
2018-11-02 12:59 ` Liran Alon
2018-11-02 12:59 ` [Qemu-devel] " Liran Alon
2018-11-02 16:44 ` Jim Mattson via Qemu-devel
2018-11-02 16:44 ` [Qemu-devel] " Jim Mattson
2018-11-02 16:58 ` Daniel P. Berrangé
2018-11-02 16:58 ` [Qemu-devel] " Daniel P. Berrangé
2018-11-02 17:01 ` Jim Mattson via Qemu-devel
2018-11-02 17:01 ` [Qemu-devel] " Jim Mattson
2018-11-02 16:54 ` Daniel P. Berrangé
2018-11-02 16:54 ` [Qemu-devel] " Daniel P. Berrangé
2018-11-02 16:58 ` Dr. David Alan Gilbert
2018-11-02 16:58 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-04 22:19 ` Paolo Bonzini
2018-11-04 22:19 ` [Qemu-devel] " Paolo Bonzini
2018-11-12 16:18 ` Daniel P. Berrangé
2018-11-12 16:18 ` [Qemu-devel] " Daniel P. Berrangé
2018-11-12 16:50 ` Dr. David Alan Gilbert
2018-11-12 16:50 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-12 16:53 ` Paolo Bonzini
2018-11-12 16:53 ` [Qemu-devel] " Paolo Bonzini
2018-11-12 16:54 ` Daniel P. Berrangé
2018-11-12 16:54 ` [Qemu-devel] " Daniel P. Berrangé
2018-11-13 0:00 ` Liran Alon
2018-11-13 0:00 ` [Qemu-devel] " Liran Alon
2018-11-13 0:07 ` Jim Mattson via Qemu-devel
2018-11-13 0:07 ` [Qemu-devel] " Jim Mattson
2018-11-13 0:09 ` Liran Alon
2018-11-13 0:09 ` [Qemu-devel] " Liran Alon
2018-11-12 23:58 ` Liran Alon
2018-11-12 23:58 ` [Qemu-devel] " Liran Alon
2018-11-02 16:39 ` Jim Mattson via Qemu-devel
2018-11-02 16:39 ` [Qemu-devel] " Jim Mattson
2018-11-03 2:02 ` Liran Alon
2018-11-03 2:02 ` [Qemu-devel] " Liran Alon
2018-11-08 0:13 ` Liran Alon
2018-11-08 0:13 ` [Qemu-devel] " Liran Alon
2018-11-08 0:45 ` Jim Mattson via Qemu-devel
2018-11-08 0:45 ` [Qemu-devel] " Jim Mattson
2018-11-08 9:50 ` Paolo Bonzini
2018-11-08 9:50 ` [Qemu-devel] " Paolo Bonzini
2018-11-08 9:57 ` Liran Alon [this message]
2018-11-08 9:57 ` Liran Alon
2018-11-08 17:02 ` Paolo Bonzini
2018-11-08 17:02 ` [Qemu-devel] " Paolo Bonzini
2018-11-08 18:41 ` Liran Alon
2018-11-08 18:41 ` [Qemu-devel] " Liran Alon
2018-11-08 20:34 ` Paolo Bonzini
2018-11-08 20:34 ` [Qemu-devel] " Paolo Bonzini
2018-11-12 14:51 ` Dr. David Alan Gilbert
2018-11-12 14:51 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-01 19:03 ` Liran Alon
2018-11-01 19:03 ` [Qemu-devel] " Liran Alon
2018-11-01 19:07 ` Dr. David Alan Gilbert
2018-11-01 19:07 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-11-01 19:41 ` Jim Mattson via Qemu-devel
2018-11-01 19:41 ` [Qemu-devel] " Jim Mattson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=939A6255-306C-431C-8799-0D56A30A3BD5@oracle.com \
--to=liran.alon@oracle.com \
--cc=dgilbert@redhat.com \
--cc=ehabkost@redhat.com \
--cc=jmattson@google.com \
--cc=kvm@vger.kernel.org \
--cc=mtosatti@redhat.com \
--cc=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=rth@twiddle.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.