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Date: Tue, 3 Feb 2015 03:40:30 +0000 From: KY Srinivasan <kys@...rosoft.com> To: Jason Wang <jasowang@...hat.com> CC: Dexuan Cui <decui@...rosoft.com>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "driverdev-devel@...uxdriverproject.org" <driverdev-devel@...uxdriverproject.org>, "olaf@...fle.de" <olaf@...fle.de>, "apw@...onical.com" <apw@...onical.com>, "vkuznets@...hat.com" <vkuznets@...hat.com>, Haiyang Zhang <haiyangz@...rosoft.com> Subject: RE: [PATCH v2 1/3] hv: hv_util: move vmbus_open() to a later place > -----Original Message----- > From: Jason Wang [mailto:jasowang@...hat.com] > Sent: Monday, February 2, 2015 7:38 PM > To: KY Srinivasan > Cc: Dexuan Cui; gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; > driverdev-devel@...uxdriverproject.org; olaf@...fle.de; > apw@...onical.com; vkuznets@...hat.com; Haiyang Zhang > Subject: RE: [PATCH v2 1/3] hv: hv_util: move vmbus_open() to a later place > > > > On Tue, Feb 3, 2015 at 11:30 AM, KY Srinivasan <kys@...rosoft.com> > wrote: > > > > > >> -----Original Message----- > >> From: Jason Wang [mailto:jasowang@...hat.com] > >> Sent: Monday, February 2, 2015 7:09 PM > >> To: Dexuan Cui > >> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; > >> driverdev- > >> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com; KY > >> Srinivasan; vkuznets@...hat.com; Haiyang Zhang > >> Subject: RE: [PATCH v2 1/3] hv: hv_util: move vmbus_open() to a > >> later place > >> > >> > >> > >> On Mon, Feb 2, 2015 at 6:09 PM, Dexuan Cui <decui@...rosoft.com> > >> wrote: > >> >> -----Original Message----- > >> >> From: Jason Wang [mailto:jasowang@...hat.com] >> Sent: Monday, > >> February 2, 2015 17:36 PM >> To: Dexuan Cui >> Cc: > >> gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; >> > >> driverdev- >> devel@...uxdriverproject.org; olaf@...fle.de; > >> apw@...onical.com; KY >> Srinivasan; vkuznets@...hat.com; Haiyang > >> Zhang >> Subject: Re: [PATCH v2 1/3] hv: hv_util: move vmbus_open() > >> to a >> later place >> >> >> >> On Mon, Feb 2, 2015 at 12:35 > >> PM, Dexuan Cui <decui@...rosoft.com> >> wrote: > >> >> > Before the line vmbus_open() returns, srv->util_cb can be > >> already >> > running > and the variables, like util_fw_version, are > >> needed by >> the > srv->util_cb. > >> >> > >> >> A questions is why we do this for util only? Can callbacks of > >> other >> devices be called before vmbus_open() returns? > >> > The variables are used in vmbus_prep_negotiate_resp(), which is > >> only > for the util devices. > >> > > >> > I think the other devices should already handle the similar issue > >> > properly. > >> > If this is not the case, we need to fix them too. > >> > >> Better to check all the others, e.g in balloon_probe(), it call > >> hv_set_drvdata() after vmbus_open() and dose several datas setups in > >> the middle. If balloon_onchannelcallback() could be called before > >> hv_set_drvdata(), the code looks wrong. > > > > Jason, > > > > For all other device types, the guest initiates the communication with > > the host and potentially negotiates appropriate (supported) version > > with the host. For the services packaged in the util driver, the flow > > is a little different - the host pushes the version information into > > the guest. So, the fix Dexuan made is only needed in the util driver. > > > > Regards, > > > > K. Y > > Thanks, so you mean for other device, it won't get any interrupt before guest > negotiate the version with host? Yes, the guest initiates the version negotiation. Are you seeing something different? K. Y > > > >> > >> Thanks > >> > >> > >
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