* [gentoo-user] gentoo-sources and xen blktap driver? @ 2012-01-07 11:51 Konstantinos Agouros 2012-01-07 13:41 ` victor romanchuk 0 siblings, 1 reply; 6+ messages in thread From: Konstantinos Agouros @ 2012-01-07 11:51 UTC (permalink / raw To: gentoo-user Hi, since xen got into the mainstream kernel the way to go is to use gentoo-sources for dom0 and the domUs. However the blktap modules are not there. Is there any way to get this to work? Konstantin -- Dipl-Inf. Konstantin Agouros aka Elwood Blues. Internet: elwood@agouros.de Altersheimerstr. 1, 81545 Muenchen, Germany. Tel +49 89 69370185 ---------------------------------------------------------------------------- "Captain, this ship will not survive the forming of the cosmos." B'Elana Torres ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [gentoo-user] gentoo-sources and xen blktap driver? 2012-01-07 11:51 [gentoo-user] gentoo-sources and xen blktap driver? Konstantinos Agouros @ 2012-01-07 13:41 ` victor romanchuk 2012-01-07 16:35 ` Pandu Poluan 0 siblings, 1 reply; 6+ messages in thread From: victor romanchuk @ 2012-01-07 13:41 UTC (permalink / raw To: gentoo-user Konstantinos Agouros wrote, at 01/07/2012 03:51 PM: > since xen got into the mainstream kernel the way to go is to use > gentoo-sources for dom0 and the domUs. However the blktap modules are not > there. Is there any way to get this to work? blktap drivers were excluded from kernel mainline since 3.x, these two threads from xen-users mailing list might put some light in that context: http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html the latest sys-kernel/xen-sources containing working blktap (not blktap2) is 2.6.38 (this is buggy from my point of view; i'm still sitting on 2.6.34-r5 for production installations) victor ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [gentoo-user] gentoo-sources and xen blktap driver? 2012-01-07 13:41 ` victor romanchuk @ 2012-01-07 16:35 ` Pandu Poluan 2012-01-07 17:40 ` Michael Mol 0 siblings, 1 reply; 6+ messages in thread From: Pandu Poluan @ 2012-01-07 16:35 UTC (permalink / raw To: gentoo-user [-- Attachment #1: Type: text/plain, Size: 1045 bytes --] On Jan 7, 2012 8:44 PM, "victor romanchuk" <rom@persimplex.net> wrote: > > Konstantinos Agouros wrote, at 01/07/2012 03:51 PM: > > since xen got into the mainstream kernel the way to go is to use > > gentoo-sources for dom0 and the domUs. However the blktap modules are not > > there. Is there any way to get this to work? > > blktap drivers were excluded from kernel mainline since 3.x, these two threads > from xen-users mailing list might put some light in that context: > > http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html > http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html > > the latest sys-kernel/xen-sources containing working blktap (not blktap2) is > 2.6.38 (this is buggy from my point of view; i'm still sitting on 2.6.34-r5 for > production installations) > Can someone shed a light on the importance of blktap, i.e., why one would want to use it when -- as someone explained in the first email thread you gave -- blkfront+blkend is enough for paravirtualization? Rgds, [-- Attachment #2: Type: text/html, Size: 1441 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [gentoo-user] gentoo-sources and xen blktap driver? 2012-01-07 16:35 ` Pandu Poluan @ 2012-01-07 17:40 ` Michael Mol 2012-01-08 0:36 ` Pandu Poluan 0 siblings, 1 reply; 6+ messages in thread From: Michael Mol @ 2012-01-07 17:40 UTC (permalink / raw To: gentoo-user On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan <pandu@poluan.info> wrote: > On Jan 7, 2012 8:44 PM, "victor romanchuk" <rom@persimplex.net> wrote: >> >> Konstantinos Agouros wrote, at 01/07/2012 03:51 PM: >> > since xen got into the mainstream kernel the way to go is to use >> > gentoo-sources for dom0 and the domUs. However the blktap modules are >> > not >> > there. Is there any way to get this to work? >> >> blktap drivers were excluded from kernel mainline since 3.x, these two >> threads >> from xen-users mailing list might put some light in that context: >> >> >> http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html >> >> http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html >> >> the latest sys-kernel/xen-sources containing working blktap (not blktap2) >> is >> 2.6.38 (this is buggy from my point of view; i'm still sitting on >> 2.6.34-r5 for >> production installations) >> > > Can someone shed a light on the importance of blktap, i.e., why one would > want to use it when -- as someone explained in the first email thread you > gave -- blkfront+blkend is enough for paravirtualization? Reading through the linked threads, it sounds like the benefit stems from being able to shim things in between the front and back ends. You might want that for any number of reasons: * a block encryption layer * a metering layer * a read/write masking layer * an intercept to have the block device exist on (or be mirrored to) on another system. etc. -- :wq ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [gentoo-user] gentoo-sources and xen blktap driver? 2012-01-07 17:40 ` Michael Mol @ 2012-01-08 0:36 ` Pandu Poluan 2012-01-08 0:43 ` Michael Mol 0 siblings, 1 reply; 6+ messages in thread From: Pandu Poluan @ 2012-01-08 0:36 UTC (permalink / raw To: gentoo-user [-- Attachment #1: Type: text/plain, Size: 1773 bytes --] On Jan 8, 2012 12:43 AM, "Michael Mol" <mikemol@gmail.com> wrote: > > On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan <pandu@poluan.info> wrote: > > On Jan 7, 2012 8:44 PM, "victor romanchuk" <rom@persimplex.net> wrote: > >> > >> Konstantinos Agouros wrote, at 01/07/2012 03:51 PM: > >> > since xen got into the mainstream kernel the way to go is to use > >> > gentoo-sources for dom0 and the domUs. However the blktap modules are > >> > not > >> > there. Is there any way to get this to work? > >> > >> blktap drivers were excluded from kernel mainline since 3.x, these two > >> threads > >> from xen-users mailing list might put some light in that context: > >> > >> > >> http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html > >> > >> http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html > >> > >> the latest sys-kernel/xen-sources containing working blktap (not blktap2) > >> is > >> 2.6.38 (this is buggy from my point of view; i'm still sitting on > >> 2.6.34-r5 for > >> production installations) > >> > > > > Can someone shed a light on the importance of blktap, i.e., why one would > > want to use it when -- as someone explained in the first email thread you > > gave -- blkfront+blkend is enough for paravirtualization? > > Reading through the linked threads, it sounds like the benefit stems > from being able to shim things in between the front and back ends. > > You might want that for any number of reasons: > * a block encryption layer > * a metering layer > * a read/write masking layer > * an intercept to have the block device exist on (or be mirrored to) > on another system. > > etc. > Ah yes, of course. One of the threads also mentioned that blktap might be better implemented in userspace. Rgds, [-- Attachment #2: Type: text/html, Size: 2607 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [gentoo-user] gentoo-sources and xen blktap driver? 2012-01-08 0:36 ` Pandu Poluan @ 2012-01-08 0:43 ` Michael Mol 0 siblings, 0 replies; 6+ messages in thread From: Michael Mol @ 2012-01-08 0:43 UTC (permalink / raw To: gentoo-user On Sat, Jan 7, 2012 at 7:36 PM, Pandu Poluan <pandu@poluan.info> wrote: > On Jan 8, 2012 12:43 AM, "Michael Mol" <mikemol@gmail.com> wrote: >> On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan <pandu@poluan.info> wrote: >> > On Jan 7, 2012 8:44 PM, "victor romanchuk" <rom@persimplex.net> wrote: >> >> >> >> Konstantinos Agouros wrote, at 01/07/2012 03:51 PM: >> >> > since xen got into the mainstream kernel the way to go is to use >> >> > gentoo-sources for dom0 and the domUs. However the blktap modules are >> >> > not >> >> > there. Is there any way to get this to work? >> >> >> >> blktap drivers were excluded from kernel mainline since 3.x, these two >> >> threads >> >> from xen-users mailing list might put some light in that context: >> >> >> >> >> >> >> >> http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html >> >> >> >> >> >> http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html >> >> >> >> the latest sys-kernel/xen-sources containing working blktap (not >> >> blktap2) >> >> is >> >> 2.6.38 (this is buggy from my point of view; i'm still sitting on >> >> 2.6.34-r5 for >> >> production installations) >> >> >> > >> > Can someone shed a light on the importance of blktap, i.e., why one >> > would >> > want to use it when -- as someone explained in the first email thread >> > you >> > gave -- blkfront+blkend is enough for paravirtualization? >> >> Reading through the linked threads, it sounds like the benefit stems >> from being able to shim things in between the front and back ends. >> >> You might want that for any number of reasons: >> * a block encryption layer >> * a metering layer >> * a read/write masking layer >> * an intercept to have the block device exist on (or be mirrored to) >> on another system. >> >> etc. >> > > Ah yes, of course. > > One of the threads also mentioned that blktap might be better implemented in > userspace. Well, there's that, too. For a while, there's been a long push in Linux to get anything that could remotely reasonably be done in userspace out of kernelspace. -- :wq ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-01-08 0:44 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-01-07 11:51 [gentoo-user] gentoo-sources and xen blktap driver? Konstantinos Agouros 2012-01-07 13:41 ` victor romanchuk 2012-01-07 16:35 ` Pandu Poluan 2012-01-07 17:40 ` Michael Mol 2012-01-08 0:36 ` Pandu Poluan 2012-01-08 0:43 ` Michael Mol
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