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Date: Thu, 29 Mar 2012 15:21:48 +0100 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: "Wei Liu (Intern)" <wei.liu2@...rix.com> CC: Stefano Stabellini <Stefano.Stabellini@...citrix.com>, Konrad Rzeszutek Wilk <konrad@...nok.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com> Subject: Re: [Xen-devel] [PATCH] xen-blkfront: set pages are FOREIGN_FRAME when sharing them On Thu, 29 Mar 2012, Wei Liu (Intern) wrote: > On Thu, 2012-03-29 at 14:56 +0100, Stefano Stabellini wrote: > > On Tue, 27 Mar 2012, Konrad Rzeszutek Wilk wrote: > > > On Tue, Mar 27, 2012 at 02:49:58PM +0100, Stefano Stabellini wrote: > > > > Set pages as FOREIGN_FRAME whenever blkfront shares them with another > > > > domain. Then when blkfront un-share them, also removes the > > > > FOREIGN_FRAME_BIT from the p2m. > > > > > > > > We do it so that when the source and the destination domain are the same > > > > (blkfront connected to blkback in the same domain) we can more easily > > > > recognize which ones are the source pfns and which ones are the > > > > destination pfns (both are going to be pointing to the same mfns). > > > > > > > > Without this patch enstablishing a connection between blkfront and QEMU > > > > qdisk in the same domain causes QEMU to hang and never return. > > > > Considering that it fixes a serious bug, it should be backported to > > > > previous releases. > > > > > > > > > ERROR: "set_phys_to_machine" [drivers/block/xen-blkfront.ko] undefined! > > > > I cannot reproduce this error: set_phys_to_machine is defined in > > arch/x86/include/asm/xen/page.h, that is included by include/xen/page.h, > > that is included by blkfront). > > What CS did you apply this patch to? What is your config? > > > > In arch/x86/xen/p2m.c, set_phys_to_machine is not exported. You need > another patch to do that. > > It might be that you were using a monolithic kernel so that you didn't > see this error. Yes, you are right. Thanks! I'll write another patch to export set_phys_to_machine. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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