Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
On 03/02/15 00:24, Luis R. Rodriguez wrote: > > As I waited I decided to finally install a 32-bit OS but I found now > that as of Xen commit 5d1181a5 which went upstream as of xen 4.3 Xen > no longer supports 32-bit for x86. You don't need a 32-bit hypervisor to run 32-bit dom0 or domUs. David -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
On Thu, Jan 29, 2015 at 12:35 PM, Luis R. Rodriguez wrote: > On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: >> On 27/01/15 08:35, Jan Beulich wrote: >> On 27.01.15 at 02:51, wrote: >> > >> > Even if David told you this would be acceptable, I have to question >> > an abstract model of fixing issues on only 64-bit kernels - this may >> > be acceptable for distro purposes, but seems hardly the right >> > approach for upstream. If 32-bit ones are to become deliberately >> > broken, the XEN config option should become dependent on !X86_32. >> >> I'd rather have something omitted (keeping the current behaviour) than >> something that has not been tested at all. >> >> Obviously it would be preferable to to fix both 32-bit and 64-bit x86 >> (and ARM as well) but I'm not going to block an important bug fix for >> the majority use case (64-bit x86). > > Hey folks, what is the status of these patches? Any more feedback? As I waited I decided to finally install a 32-bit OS but I found now that as of Xen commit 5d1181a5 which went upstream as of xen 4.3 Xen no longer supports 32-bit for x86. So -- Xen no loner even builds on 32-bit systems. The latest version I could use then would be Xen 4.2 but the even the stable-4.2 branch fails to build for me even after fixing quite a bit of compile failures, I'm just going to give up now. I want to build Xen as I'm relying on some customized emulated delays on the hypervisor in order to test the issue, otherwise I'd have to dedicate a huge system to reproduce this issue. While it is possible folks on old xen may use newer kernels this issue is likely not a high priority on those 32-bit systems and likely hard to reproduce there. When and if someone is able to test this on a 32-bit kernel / hypervisor then they can test the small patch below. Can we move forward with the 64-bit part then? diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 000d419..b4b1f42 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -982,6 +982,8 @@ ENTRY(xen_hypervisor_callback) ENTRY(xen_do_upcall) 1:mov %esp, %eax call xen_evtchn_do_upcall +movl %esp,%eax +call xen_end_upcall jmp ret_from_intr CFI_ENDPROC ENDPROC(xen_hypervisor_callback) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: > On 27/01/15 08:35, Jan Beulich wrote: > On 27.01.15 at 02:51, wrote: > > > > Even if David told you this would be acceptable, I have to question > > an abstract model of fixing issues on only 64-bit kernels - this may > > be acceptable for distro purposes, but seems hardly the right > > approach for upstream. If 32-bit ones are to become deliberately > > broken, the XEN config option should become dependent on !X86_32. > > I'd rather have something omitted (keeping the current behaviour) than > something that has not been tested at all. > > Obviously it would be preferable to to fix both 32-bit and 64-bit x86 > (and ARM as well) but I'm not going to block an important bug fix for > the majority use case (64-bit x86). Hey folks, what is the status of these patches? Any more feedback? Luis -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: > On 27/01/15 08:35, Jan Beulich wrote: > On 27.01.15 at 02:51, wrote: > > > > Even if David told you this would be acceptable, I have to question > > an abstract model of fixing issues on only 64-bit kernels - this may > > be acceptable for distro purposes, but seems hardly the right > > approach for upstream. If 32-bit ones are to become deliberately > > broken, the XEN config option should become dependent on !X86_32. > > I'd rather have something omitted (keeping the current behaviour) than > something that has not been tested at all. > > Obviously it would be preferable to to fix both 32-bit and 64-bit x86 > (and ARM as well) but I'm not going to block an important bug fix for > the majority use case (64-bit x86). The hunk for 32-bit should indeed only go in once we get a Tested-by. Please let me know if there is anything else needed for this patch. Luis -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, wrote: > > Even if David told you this would be acceptable, I have to question > an abstract model of fixing issues on only 64-bit kernels - this may > be acceptable for distro purposes, but seems hardly the right > approach for upstream. If 32-bit ones are to become deliberately > broken, the XEN config option should become dependent on !X86_32. I'd rather have something omitted (keeping the current behaviour) than something that has not been tested at all. Obviously it would be preferable to to fix both 32-bit and 64-bit x86 (and ARM as well) but I'm not going to block an important bug fix for the majority use case (64-bit x86). David -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit
>>> On 27.01.15 at 02:51, wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this may be acceptable for distro purposes, but seems hardly the right approach for upstream. If 32-bit ones are to become deliberately broken, the XEN config option should become dependent on !X86_32. Jan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
