From: Avi Kivity <avi@redhat.com>
To: prasad@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org,
Alan Stern <stern@rowland.harvard.edu>,
Roland McGrath <roland@redhat.com>,
akpm@linux-foundation.org, mingo@elte.hu,
jason.wessel@windriver.com, richardj_moore@uk.ibm.com
Subject: Re: [RFC Patch 0/9] Hardware Breakpoint interfaces
Date: Tue, 07 Oct 2008 14:29:05 +0200 [thread overview]
Message-ID: <48EB5611.9090005@redhat.com> (raw)
In-Reply-To: <20081007113815.GA23523@in.ibm.com>
K.Prasad wrote:
> - Enable KGDB and KVM to use the register_kernel_hw_breakpoint()
> interface for their HW Breakpoint usage, in the absence of which
> they will be broken during simultaneous use.
>
KVM conceptually isn't a kernel use of the debug registers. KVM
modifies the debug registers while the guest is running, and restores
them after the guest returns.
Right now, as an optimization, KVM defers restoring the debug registers
until after the next context switch out of the kvm task, or until the
next exit to userspace (whichever comes earlier); we should change this
to avoid the deferral if kernel breakpoints are in effect. This will
allow simultaneous use of KVM breakpoints and kernel breakpoints.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-10-07 12:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-07 11:38 [RFC Patch 0/9] Hardware Breakpoint interfaces K.Prasad
2008-10-07 11:40 ` [RFC Patch 1/9] Introducing generic hardware breakpoint handler interfaces K.Prasad
2008-10-07 15:21 ` Alan Stern
2008-10-07 16:49 ` K.Prasad
2008-10-07 11:41 ` [RFC Patch 2/9] x86 architecture implementation of Hardware Breakpoint interfaces K.Prasad
2008-10-07 15:36 ` Alan Stern
2008-10-07 17:23 ` K.Prasad
2008-10-07 17:38 ` Alan Stern
2008-10-07 17:28 ` K.Prasad
2008-10-07 11:42 ` [RFC Patch 3/9] Modifying generic debug exception to use virtual debug registers K.Prasad
2008-10-07 11:43 ` [RFC Patch 4/9] Modify kprobe exception handler to recognise single-stepping by HW Breakpoint handler K.Prasad
2008-10-07 11:44 ` [RFC Patch 5/9] Use wrapper routines around debug registers in processor related functions K.Prasad
2008-10-07 11:44 ` [RFC Patch 6/9] Use virtual debug registers in process/thread handling code K.Prasad
2008-10-07 15:40 ` Alan Stern
2008-10-07 17:48 ` K.Prasad
2008-10-07 11:45 ` [RFC Patch 7/9] Modify signal handling code to refrain from re-enabling HW Breakpoints K.Prasad
2008-10-07 11:46 ` [RFC Patch 8/9] Modify Ptrace to use wrapper routines to access breakpoint registers K.Prasad
2008-10-07 11:46 ` [RFC Patch 9/9] Cleanup HW Breakpoint registers before kexec K.Prasad
2008-10-07 12:29 ` Avi Kivity [this message]
2008-10-07 14:32 ` [RFC Patch 0/9] Hardware Breakpoint interfaces K.Prasad
2008-10-07 14:36 ` Avi Kivity
2008-10-07 16:45 ` K.Prasad
2008-10-07 16:52 ` Avi Kivity
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=48EB5611.9090005@redhat.com \
--to=avi@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=jason.wessel@windriver.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=prasad@linux.vnet.ibm.com \
--cc=richardj_moore@uk.ibm.com \
--cc=roland@redhat.com \
--cc=stern@rowland.harvard.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).