From: David Vrabel <david.vrabel@citrix.com>
To: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>,
<david.vrabel@citrix.com>, <konrad.wilk@oracle.com>,
<boris.ostrovsky@oracle.com>, <xen-devel@lists.xenproject.org>
Cc: Borislav Petkov <bp@suse.de>, <kvm@vger.kernel.org>,
"Luis R. Rodriguez" <mcgrof@suse.com>, <x86@kernel.org>,
<linux-kernel@vger.kernel.org>, <rostedt@goodmis.org>,
Andy Lutomirski <luto@amacapital.net>,
Ingo Molnar <mingo@redhat.com>, Jan Beulich <JBeulich@suse.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Thomas Gleixner <tglx@linutronix.de>,
<paulmck@linux.vnet.ibm.com>
Subject: Re: [Xen-devel] [PATCH v5 1/2] xen: add xen_is_preemptible_hypercall()
Date: Tue, 3 Feb 2015 11:05:15 +0000 [thread overview]
Message-ID: <54D0AB6B.9060909@citrix.com> (raw)
In-Reply-To: <1422323467-16713-2-git-send-email-mcgrof@do-not-panic.com>
On 27/01/15 01:51, Luis R. Rodriguez wrote:
>
> +#ifndef CONFIG_PREEMPT
> +extern struct { char _entry[32]; } preemptible_hypercall_page[];
> +
> +static inline bool xen_is_preemptible_hypercall(struct pt_regs *regs)
> +{
> + return !user_mode_vm(regs) &&
> + regs->ip >= (unsigned long)preemptible_hypercall_page &&
> + regs->ip < (unsigned long)preemptible_hypercall_page + PAGE_SIZE;
I asked for this test to be optimized.
return (regs->ip >> PAGE_SHIFT)
== ((unsigned long)preemptible_hypercall_page >> PAGE_SHIFT)
&& !user_mode_vm(regs);
David
next prev parent reply other threads:[~2015-02-03 11:05 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-27 1:51 [PATCH v5 0/2] x86/xen: add xen hypercall preemption Luis R. Rodriguez
2015-01-27 1:51 ` [PATCH v5 1/2] xen: add xen_is_preemptible_hypercall() Luis R. Rodriguez
2015-02-03 11:05 ` David Vrabel [this message]
2015-02-03 18:03 ` Luis R. Rodriguez
2015-02-03 18:03 ` [Xen-devel] " Luis R. Rodriguez
2015-02-03 11:05 ` David Vrabel
2015-01-27 1:51 ` Luis R. Rodriguez
2015-01-27 1:51 ` [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit Luis R. Rodriguez
2015-01-27 1:51 ` Luis R. Rodriguez
2015-01-27 8:35 ` Jan Beulich
2015-01-27 8:35 ` Jan Beulich
2015-01-27 10:01 ` [Xen-devel] " Andrew Cooper
2015-01-27 10:01 ` Andrew Cooper
2015-01-27 10:06 ` David Vrabel
2015-01-27 20:12 ` Luis R. Rodriguez
2015-01-27 20:12 ` Luis R. Rodriguez
2015-01-29 20:35 ` Luis R. Rodriguez
2015-02-03 0:24 ` Luis R. Rodriguez
2015-02-03 0:24 ` Luis R. Rodriguez
2015-02-03 9:58 ` David Vrabel
2015-02-03 9:58 ` David Vrabel
2015-01-29 20:35 ` Luis R. Rodriguez
2015-01-27 10:06 ` David Vrabel
2015-02-05 12:47 ` [Xen-devel] [PATCH v5 0/2] x86/xen: add xen hypercall preemption David Vrabel
2015-02-05 18:15 ` Luis R. Rodriguez
2015-02-05 18:15 ` Luis R. Rodriguez
2015-02-05 12:47 ` David Vrabel
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=54D0AB6B.9060909@citrix.com \
--to=david.vrabel@citrix.com \
--cc=JBeulich@suse.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@suse.de \
--cc=hpa@zytor.com \
--cc=konrad.wilk@oracle.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=masami.hiramatsu.pt@hitachi.com \
--cc=mcgrof@do-not-panic.com \
--cc=mcgrof@suse.com \
--cc=mingo@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/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.