From: Wei Chen <Wei.Chen@arm.com>
To: Jan Beulich <jbeulich@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"julien@xen.org" <julien@xen.org>,
Bertrand Marquis <Bertrand.Marquis@arm.com>
Subject: RE: [PATCH 20/37] xen: introduce CONFIG_EFI to stub API for non-EFI architecture
Date: Sun, 3 Oct 2021 23:28:24 +0000 [thread overview]
Message-ID: <DB9PR08MB68576ADE0EC584A49C63E5FE9EAD9@DB9PR08MB6857.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <f872f421-dddf-7fde-34ce-210ddc55a87f@suse.com>
> -----Original Message-----
> From: Jan Beulich <jbeulich@suse.com>
> Sent: 2021年9月28日 16:03
> To: Stefano Stabellini <sstabellini@kernel.org>; Wei Chen
> <Wei.Chen@arm.com>
> Cc: xen-devel@lists.xenproject.org; julien@xen.org; Bertrand Marquis
> <Bertrand.Marquis@arm.com>
> Subject: Re: [PATCH 20/37] xen: introduce CONFIG_EFI to stub API for non-
> EFI architecture
>
> On 28.09.2021 07:01, Stefano Stabellini wrote:
> > On Tue, 28 Sep 2021, Wei Chen wrote:
> >>> -----Original Message-----
> >>> From: Stefano Stabellini <sstabellini@kernel.org>
> >>> Sent: 2021年9月28日 9:00
> >>> To: Wei Chen <Wei.Chen@arm.com>
> >>> Cc: Jan Beulich <jbeulich@suse.com>; xen-devel@lists.xenproject.org;
> >>> julien@xen.org; Bertrand Marquis <Bertrand.Marquis@arm.com>; Stefano
> >>> Stabellini <sstabellini@kernel.org>
> >>> Subject: RE: [PATCH 20/37] xen: introduce CONFIG_EFI to stub API for
> non-
> >>> EFI architecture
> >>>
> >>> On Mon, 27 Sep 2021, Wei Chen wrote:
> >>>>> -----Original Message-----
> >>>>> From: Xen-devel <xen-devel-bounces@lists.xenproject.org> On Behalf
> Of
> >>> Wei
> >>>>> Chen
> >>>>> Sent: 2021年9月26日 18:25
> >>>>> To: Jan Beulich <jbeulich@suse.com>
> >>>>> Cc: xen-devel@lists.xenproject.org; julien@xen.org; Bertrand Marquis
> >>>>> <Bertrand.Marquis@arm.com>; Stefano Stabellini
> <sstabellini@kernel.org>
> >>>>> Subject: RE: [PATCH 20/37] xen: introduce CONFIG_EFI to stub API for
> >>> non-
> >>>>> EFI architecture
> >>>>>
> >>>>> Hi Jan,
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Xen-devel <xen-devel-bounces@lists.xenproject.org> On Behalf
> >>> Of
> >>>>> Jan
> >>>>>> Beulich
> >>>>>> Sent: 2021年9月24日 18:49
> >>>>>> To: Wei Chen <Wei.Chen@arm.com>
> >>>>>> Cc: xen-devel@lists.xenproject.org; julien@xen.org; Bertrand
> Marquis
> >>>>>> <Bertrand.Marquis@arm.com>; Stefano Stabellini
> >>> <sstabellini@kernel.org>
> >>>>>> Subject: Re: [PATCH 20/37] xen: introduce CONFIG_EFI to stub API
> for
> >>>>> non-
> >>>>>> EFI architecture
> >>>>>>
> >>>>>> On 24.09.2021 12:31, Wei Chen wrote:
> >>>>>>>> From: Jan Beulich <jbeulich@suse.com>
> >>>>>>>> Sent: 2021年9月24日 15:59
> >>>>>>>>
> >>>>>>>> On 24.09.2021 06:34, Wei Chen wrote:
> >>>>>>>>>> From: Stefano Stabellini <sstabellini@kernel.org>
> >>>>>>>>>> Sent: 2021年9月24日 9:15
> >>>>>>>>>>
> >>>>>>>>>> On Thu, 23 Sep 2021, Wei Chen wrote:
> >>>>>>>>>>> --- a/xen/common/Kconfig
> >>>>>>>>>>> +++ b/xen/common/Kconfig
> >>>>>>>>>>> @@ -11,6 +11,16 @@ config COMPAT
> >>>>>>>>>>> config CORE_PARKING
> >>>>>>>>>>> bool
> >>>>>>>>>>>
> >>>>>>>>>>> +config EFI
> >>>>>>>>>>> + bool
> >>>>>>>>>>
> >>>>>>>>>> Without the title the option is not user-selectable (or de-
> >>>>>> selectable).
> >>>>>>>>>> So the help message below can never be seen.
> >>>>>>>>>>
> >>>>>>>>>> Either add a title, e.g.:
> >>>>>>>>>>
> >>>>>>>>>> bool "EFI support"
> >>>>>>>>>>
> >>>>>>>>>> Or fully make the option a silent option by removing the help
> >>> text.
> >>>>>>>>>
> >>>>>>>>> OK, in current Xen code, EFI is unconditionally compiled. Before
> >>>>>>>>> we change related code, I prefer to remove the help text.
> >>>>>>>>
> >>>>>>>> But that's not true: At least on x86 EFI gets compiled depending
> >>> on
> >>>>>>>> tool chain capabilities. Ultimately we may indeed want a user
> >>>>>>>> selectable option here, but until then I'm afraid having this
> >>> option
> >>>>>>>> at all may be misleading on x86.
> >>>>>>>>
> >>>>>>>
> >>>>>>> I check the build scripts, yes, you're right. For x86, EFI is not
> >>> a
> >>>>>>> selectable option in Kconfig. I agree with you, we can't use
> >>> Kconfig
> >>>>>>> system to decide to enable EFI build for x86 or not.
> >>>>>>>
> >>>>>>> So how about we just use this EFI option for Arm only? Because on
> >>> Arm,
> >>>>>>> we do not have such toolchain dependency.
> >>>>>>
> >>>>>> To be honest - don't know. That's because I don't know what you
> want
> >>>>>> to use the option for subsequently.
> >>>>>>
> >>>>>
> >>>>> In last version, I had introduced an arch-helper to stub EFI_BOOT
> >>>>> in Arm's common code for Arm32. Because Arm32 doesn't support EFI.
> >>>>> So Julien suggested me to introduce a CONFIG_EFI option for non-EFI
> >>>>> supported architectures to stub in EFI layer.
> >>>>>
> >>>>> [1] https://lists.xenproject.org/archives/html/xen-devel/2021-
> >>>>> 08/msg00808.html
> >>>>>
> >>>>
> >>>> As Jan' reminded, x86 doesn't depend on Kconfig to build EFI code.
> >>>> So, if we CONFIG_EFI to stub EFI API's for x86, we will encounter
> >>>> that toolchains enable EFI, but Kconfig disable EFI. Or Kconfig
> >>>> enable EFI but toolchain doesn't provide EFI build supports. And
> >>>> then x86 could not work well.
> >>>>
> >>>> If we use CONFIG_EFI for Arm only, that means CONFIG_EFI for x86
> >>>> is off, this will also cause problem.
> >>>>
> >>>> So, can we still use previous arch_helpers to stub for Arm32?
> >>>> until x86 can use this selectable option?
> >>>
> >>> EFI doesn't have to be necessarily a user-visible option in Kconfig at
> >>> this point. I think Julien was just asking to make the #ifdef based on
> >>> a EFI-related config rather than just based CONFIG_ARM64.
> >>>
> >>> On x86 EFI is detected based on compiler support, setting
> XEN_BUILD_EFI
> >>> in xen/arch/x86/Makefile. Let's say that we keep using the same name
> >>> "XEN_BUILD_EFI" on ARM as well.
> >>>
> >>> On ARM32, XEN_BUILD_EFI should be always unset.
> >>>
> >>> On ARM64 XEN_BUILD_EFI should be always set.
> >>>
> >>> That's it, right? I'd argue that CONFIG_EFI or HAS_EFI are better
> names
> >>> than XEN_BUILD_EFI, but that's OK anyway. So for instance you can make
> >>> XEN_BUILD_EFI an invisible symbol in xen/arch/arm/Kconfig and select
> it
> >>> only on ARM64.
> >>
> >> Thanks, this is a good approach. But if we place XEN_BUILD_EFI in
> Kconfig
> >> it will be transfer to CONFIG_XEN_BUILD_EFI. How about using another
> name
> >> in Kconfig like ARM_EFI, but use CONFIG_ARM_EFI in config.h to define
> >> XEN_BUILD_EFI?
> >
> > I am OK with that. Another option is to rename XEN_BUILD_EFI to
> > CONFIG_XEN_BUILD_EFI on x86. Either way is fine by me. Jan, do you havea
> > preference?
>
> Yes, I do: No new CONFIG_* settings please that don't originate from
> Kconfig. Hence I'm afraid this is a "no" to your suggestion.
>
> Mid-term we should try to get rid of the remaining CONFIG_* which
> get #define-d in e.g. asm/config.h.
>
I will do something like this:
- introduce an ARM_EFI invisible symbol in kconfig, selected by ARM64 only
- use CONFIG_ARM_EFI to define XEN_BUILD_EFI in config.h
> Jan
next prev parent reply other threads:[~2021-10-03 23:29 UTC|newest]
Thread overview: 192+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 12:01 [PATCH 00/37] Add device tree based NUMA support to Arm Wei Chen
2021-09-23 12:02 ` [PATCH 01/37] xen/arm: Print a 64-bit number in hex from early uart Wei Chen
2021-09-23 12:02 ` [PATCH 02/37] xen: introduce a Kconfig option to configure NUMA nodes number Wei Chen
2021-09-23 23:45 ` Stefano Stabellini
2021-09-24 1:24 ` Wei Chen
2021-09-24 8:55 ` Jan Beulich
2021-09-24 10:33 ` Wei Chen
2021-09-24 10:47 ` Jan Beulich
2021-09-23 12:02 ` [PATCH 03/37] xen/x86: Initialize memnodemapsize while faking NUMA node Wei Chen
2021-09-24 8:57 ` Jan Beulich
2021-09-24 10:34 ` Wei Chen
2021-09-23 12:02 ` [PATCH 04/37] xen: introduce an arch helper for default dma zone status Wei Chen
2021-09-23 23:55 ` Stefano Stabellini
2021-09-24 1:50 ` Wei Chen
2022-01-17 16:10 ` Jan Beulich
2022-01-18 7:51 ` Wei Chen
2022-01-18 8:16 ` Jan Beulich
2022-01-18 9:20 ` Wei Chen
2022-01-18 14:16 ` Jan Beulich
2022-01-19 2:49 ` Wei Chen
2022-01-19 7:50 ` Jan Beulich
2022-01-19 8:33 ` Wei Chen
2021-09-23 12:02 ` [PATCH 05/37] xen: decouple NUMA from ACPI in Kconfig Wei Chen
2021-09-23 12:02 ` [PATCH 06/37] xen/arm: use !CONFIG_NUMA to keep fake NUMA API Wei Chen
2021-09-24 0:05 ` Stefano Stabellini
2021-09-24 10:21 ` Wei Chen
2021-09-23 12:02 ` [PATCH 07/37] xen/x86: use paddr_t for addresses in NUMA node structure Wei Chen
2021-09-24 0:11 ` Stefano Stabellini
2021-09-24 0:13 ` Stefano Stabellini
2021-09-24 3:00 ` Wei Chen
2022-01-18 15:22 ` Jan Beulich
2022-01-19 6:33 ` Wei Chen
2022-01-19 7:55 ` Jan Beulich
2022-01-19 8:36 ` Wei Chen
2021-09-23 12:02 ` [PATCH 08/37] xen/x86: add detection of discontinous node memory range Wei Chen
2021-09-24 0:25 ` Stefano Stabellini
2021-09-24 4:28 ` Wei Chen
2021-09-24 19:52 ` Stefano Stabellini
2021-09-26 10:11 ` Wei Chen
2021-09-27 3:13 ` Stefano Stabellini
2021-09-27 5:05 ` Stefano Stabellini
2021-09-27 9:50 ` Wei Chen
2021-09-27 17:19 ` Stefano Stabellini
2021-09-28 4:41 ` Wei Chen
2021-09-28 4:59 ` Stefano Stabellini
2022-01-18 16:13 ` Jan Beulich
2022-01-19 7:33 ` Wei Chen
2022-01-19 8:01 ` Jan Beulich
2022-01-19 8:24 ` Wei Chen
2021-09-23 12:02 ` [PATCH 09/37] xen/x86: introduce two helpers to access memory hotplug end Wei Chen
2021-09-24 0:29 ` Stefano Stabellini
2021-09-24 4:21 ` Wei Chen
2022-01-24 16:24 ` Jan Beulich
2022-01-26 7:53 ` Wei Chen
2021-09-23 12:02 ` [PATCH 10/37] xen/x86: use helpers to access/update mem_hotplug Wei Chen
2021-09-24 0:31 ` Stefano Stabellini
2021-09-24 4:29 ` Wei Chen
2022-01-24 16:29 ` Jan Beulich
2022-01-26 7:58 ` Wei Chen
2021-09-23 12:02 ` [PATCH 11/37] xen/x86: abstract neutral code from acpi_numa_memory_affinity_init Wei Chen
2021-09-24 0:38 ` Stefano Stabellini
2022-01-24 16:50 ` Jan Beulich
2022-01-26 10:39 ` Wei Chen
2021-09-23 12:02 ` [PATCH 12/37] xen/x86: decouple nodes_cover_memory from E820 map Wei Chen
2021-09-24 0:39 ` Stefano Stabellini
2022-01-24 16:59 ` Jan Beulich
2022-01-27 8:03 ` Wei Chen
2022-01-27 8:08 ` Jan Beulich
2022-01-27 9:03 ` Wei Chen
2022-01-27 9:22 ` Jan Beulich
2022-01-27 9:27 ` Wei Chen
2021-09-23 12:02 ` [PATCH 13/37] xen/x86: decouple processor_nodes_parsed from acpi numa functions Wei Chen
2021-09-24 0:40 ` Stefano Stabellini
2022-01-25 9:49 ` Jan Beulich
2022-01-27 8:06 ` Wei Chen
2021-09-23 12:02 ` [PATCH 14/37] xen/x86: use name fw_numa to replace acpi_numa Wei Chen
2021-09-24 0:40 ` Stefano Stabellini
2022-01-25 10:12 ` Jan Beulich
2022-01-27 8:09 ` Wei Chen
2021-09-23 12:02 ` [PATCH 15/37] xen/x86: rename acpi_scan_nodes to numa_scan_nodes Wei Chen
2021-09-24 0:40 ` Stefano Stabellini
2022-01-25 10:17 ` Jan Beulich
2022-01-27 8:14 ` Wei Chen
2021-09-23 12:02 ` [PATCH 16/37] xen/x86: export srat_bad to external Wei Chen
2021-09-24 0:41 ` Stefano Stabellini
2022-01-25 10:22 ` Jan Beulich
2022-01-27 8:35 ` Wei Chen
2022-01-27 8:37 ` Jan Beulich
2022-01-27 8:47 ` Wei Chen
2021-09-23 12:02 ` [PATCH 17/37] xen/x86: use CONFIG_NUMA to gate numa_scan_nodes Wei Chen
2021-09-24 0:41 ` Stefano Stabellini
2022-01-25 10:26 ` Jan Beulich
2022-01-27 8:37 ` Wei Chen
2021-09-23 12:02 ` [PATCH 18/37] xen: move NUMA common code from x86 to common Wei Chen
2021-09-23 12:02 ` [PATCH 19/37] xen/x86: promote VIRTUAL_BUG_ON to ASSERT in Wei Chen
2022-01-17 16:21 ` Jan Beulich
2022-01-18 7:52 ` Wei Chen
2021-09-23 12:02 ` [PATCH 20/37] xen: introduce CONFIG_EFI to stub API for non-EFI architecture Wei Chen
2021-09-24 1:15 ` Stefano Stabellini
2021-09-24 4:34 ` Wei Chen
2021-09-24 7:58 ` Jan Beulich
2021-09-24 10:31 ` Wei Chen
2021-09-24 10:49 ` Jan Beulich
2021-09-26 10:25 ` Wei Chen
2021-09-27 10:28 ` Wei Chen
2021-09-28 0:59 ` Stefano Stabellini
2021-09-28 4:16 ` Wei Chen
2021-09-28 5:01 ` Stefano Stabellini
2021-09-28 8:02 ` Jan Beulich
2021-10-03 23:28 ` Wei Chen [this message]
2022-01-25 10:34 ` Jan Beulich
2022-01-27 8:44 ` Wei Chen
2022-01-27 8:51 ` Wei Chen
2022-01-27 9:00 ` Jan Beulich
2022-01-27 9:09 ` Wei Chen
2022-01-27 9:16 ` Jan Beulich
2022-01-27 9:25 ` Wei Chen
2022-01-27 9:27 ` Jan Beulich
2022-01-27 10:00 ` Julien Grall
2022-01-28 4:35 ` Wei Chen
2021-09-23 12:02 ` [PATCH 21/37] xen/arm: Keep memory nodes in dtb for NUMA when boot from EFI Wei Chen
2021-09-24 1:23 ` Stefano Stabellini
2021-09-24 4:36 ` Wei Chen
2022-01-25 10:38 ` Jan Beulich
2022-01-27 8:45 ` Wei Chen
2021-09-23 12:02 ` [PATCH 22/37] xen/arm: use NR_MEM_BANKS to override default NR_NODE_MEMBLKS Wei Chen
2021-09-24 1:34 ` Stefano Stabellini
2021-09-26 13:13 ` Wei Chen
2021-09-27 3:25 ` Stefano Stabellini
2021-09-27 4:18 ` Wei Chen
2021-09-27 4:59 ` Stefano Stabellini
2021-09-27 6:25 ` Julien Grall
2021-09-27 6:46 ` Wei Chen
2021-09-27 6:53 ` Wei Chen
2021-09-27 7:35 ` Julien Grall
2021-09-27 10:21 ` Wei Chen
2021-09-27 10:39 ` Julien Grall
2021-09-27 16:58 ` Stefano Stabellini
2021-09-28 2:57 ` Wei Chen
2021-09-23 12:02 ` [PATCH 23/37] xen/arm: implement node distance helpers for Arm Wei Chen
2021-09-24 1:46 ` Stefano Stabellini
2021-09-24 4:41 ` Wei Chen
2021-09-24 19:36 ` Stefano Stabellini
2021-09-26 10:15 ` Wei Chen
2021-09-23 12:02 ` [PATCH 24/37] xen/arm: implement two arch helpers to get memory map info Wei Chen
2021-09-24 2:06 ` Stefano Stabellini
2021-09-24 4:42 ` Wei Chen
2021-09-23 12:02 ` [PATCH 25/37] xen/arm: implement bad_srat for Arm NUMA initialization Wei Chen
2021-09-24 2:09 ` Stefano Stabellini
2021-09-24 4:45 ` Wei Chen
2021-09-24 8:07 ` Jan Beulich
2021-09-24 19:33 ` Stefano Stabellini
2021-09-23 12:02 ` [PATCH 26/37] xen/arm: build NUMA cpu_to_node map in dt_smp_init_cpus Wei Chen
2021-09-24 2:26 ` Stefano Stabellini
2021-09-24 4:25 ` Wei Chen
2021-09-23 12:02 ` [PATCH 27/37] xen/arm: Add boot and secondary CPU to NUMA system Wei Chen
2021-09-23 12:02 ` [PATCH 28/37] xen/arm: stub memory hotplug access helpers for Arm Wei Chen
2021-09-24 2:33 ` Stefano Stabellini
2021-09-24 4:26 ` Wei Chen
2021-09-23 12:02 ` [PATCH 29/37] xen/arm: introduce a helper to parse device tree processor node Wei Chen
2021-09-24 2:44 ` Stefano Stabellini
2021-09-24 4:46 ` Wei Chen
2021-09-23 12:02 ` [PATCH 30/37] xen/arm: introduce a helper to parse device tree memory node Wei Chen
2021-09-24 3:05 ` Stefano Stabellini
2021-09-24 7:54 ` Wei Chen
2021-09-23 12:02 ` [PATCH 31/37] xen/arm: introduce a helper to parse device tree NUMA distance map Wei Chen
2021-09-24 3:05 ` Stefano Stabellini
2021-09-24 5:23 ` Wei Chen
2021-09-23 12:02 ` [PATCH 32/37] xen/arm: unified entry to parse all NUMA data from device tree Wei Chen
2021-09-24 3:16 ` Stefano Stabellini
2021-09-24 7:58 ` Wei Chen
2021-09-24 19:42 ` Stefano Stabellini
2021-09-23 12:02 ` [PATCH 33/37] xen/arm: keep guest still be NUMA unware Wei Chen
2021-09-24 3:19 ` Stefano Stabellini
2021-09-24 10:23 ` Wei Chen
2021-09-23 12:02 ` [PATCH 34/37] xen/arm: enable device tree based NUMA in system init Wei Chen
2021-09-24 3:28 ` Stefano Stabellini
2021-09-24 9:52 ` Wei Chen
2021-09-23 12:02 ` [PATCH 35/37] xen/arm: use CONFIG_NUMA to gate node_online_map in smpboot Wei Chen
2021-09-23 12:02 ` [PATCH 36/37] xen/arm: Provide Kconfig options for Arm to enable NUMA Wei Chen
2021-09-24 3:31 ` Stefano Stabellini
2021-09-24 10:13 ` Wei Chen
2021-09-24 19:39 ` Stefano Stabellini
2021-09-27 8:33 ` Jan Beulich
2021-09-27 8:45 ` Julien Grall
2021-09-27 9:17 ` Jan Beulich
2021-09-27 17:17 ` Stefano Stabellini
2021-09-28 2:59 ` Wei Chen
2021-09-28 3:30 ` Stefano Stabellini
2021-09-24 10:25 ` Jan Beulich
2021-09-24 10:37 ` Wei Chen
2021-09-23 12:02 ` [PATCH 37/37] docs: update numa command line to support Arm Wei Chen
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