[gentoo-user] gentoo-sources and xen blktap driver?
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: elw...@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
Re: [gentoo-user] gentoo-sources and xen blktap driver?
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
Re: [gentoo-user] gentoo-sources and xen blktap driver?
On Jan 7, 2012 8:44 PM, victor romanchuk r...@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,
Re: [gentoo-user] gentoo-sources and xen blktap driver?
On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan pa...@poluan.info wrote: On Jan 7, 2012 8:44 PM, victor romanchuk r...@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
Re: [gentoo-user] gentoo-sources and xen blktap driver?
On Jan 8, 2012 12:43 AM, Michael Mol mike...@gmail.com wrote: On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan pa...@poluan.info wrote: On Jan 7, 2012 8:44 PM, victor romanchuk r...@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,
Re: [gentoo-user] gentoo-sources and xen blktap driver?
On Sat, Jan 7, 2012 at 7:36 PM, Pandu Poluan pa...@poluan.info wrote: On Jan 8, 2012 12:43 AM, Michael Mol mike...@gmail.com wrote: On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan pa...@poluan.info wrote: On Jan 7, 2012 8:44 PM, victor romanchuk r...@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
