From: "Emilio G. Cota" <cota@braap.org>
To: "Lluís Vilanova" <vilanova@ac.upc.edu>
Cc: qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v8 0/5] hypertrace: Lightweight guest-to-QEMU trace channel
Date: Fri, 25 Aug 2017 20:34:54 -0400 [thread overview]
Message-ID: <20170826003454.GA23546@flamenco> (raw)
In-Reply-To: <150142369849.12995.11229612194223213120.stgit@frigg.lan>
On Sun, Jul 30, 2017 at 17:08:18 +0300, Lluís Vilanova wrote:
> The hypertrace channel allows guest code to emit events in QEMU (the host) using
> its tracing infrastructure (see "docs/trace.txt"). This works in both 'system'
> and 'user' modes, is architecture-agnostic and introduces minimal noise on the
> guest.
>
> See first commit for a full description, use-cases and an example.
>
> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
This would be indeed very useful once TCG instrumentation is in place.
However, I'm not very excited about this being PCI-only and Linux-only for
system mode
I wonder how we could make this work on all hosts -- did you consider using
"magic" instructions? We'd need a different magic instruction for each
guest ISA, but the library would hide that anyway (and the library code
would be the same for user and system modes).
Thanks,
Emilio
next prev parent reply other threads:[~2017-08-26 0:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-30 14:08 [Qemu-devel] [PATCH v8 0/5] hypertrace: Lightweight guest-to-QEMU trace channel Lluís Vilanova
2017-07-30 14:12 ` [Qemu-devel] [PATCH v8 1/5] hypertrace: Add documentation Lluís Vilanova
2017-08-04 17:50 ` Eric Blake
2017-07-30 14:16 ` [Qemu-devel] [PATCH v8 2/5] hypertrace: Add tracing event "guest_hypertrace" Lluís Vilanova
2017-07-30 14:20 ` [Qemu-devel] [PATCH v8 3/5] hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event Lluís Vilanova
2017-07-30 14:24 ` [Qemu-devel] [PATCH v8 4/5] hypertrace: [softmmu] " Lluís Vilanova
2017-07-30 14:28 ` [Qemu-devel] [PATCH v8 5/5] hypertrace: Add guest-side user-level library Lluís Vilanova
2017-07-30 14:49 ` [Qemu-devel] [PATCH v8 0/5] hypertrace: Lightweight guest-to-QEMU trace channel no-reply
2017-08-04 15:34 ` Stefan Hajnoczi
2017-08-04 18:32 ` Lluís Vilanova
2017-08-08 12:25 ` Stefan Hajnoczi
2017-08-26 0:34 ` Emilio G. Cota [this message]
2017-08-31 11:59 ` Stefan Hajnoczi
2017-08-31 15:13 ` Lluís Vilanova
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=20170826003454.GA23546@flamenco \
--to=cota@braap.org \
--cc=lcapitulino@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@redhat.com \
--cc=vilanova@ac.upc.edu \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).