From: Mark Rutland <mark.rutland@arm.com>
To: Will Deacon <will.deacon@arm.com>
Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org,
catalin.marinas@arm.com, linux-kernel@vger.kernel.org,
peter.huangpeng@huawei.com, julien.grall@arm.com,
stefano.stabellini@citrix.com,
Shannon Zhao <shannon.zhao@linaro.org>,
zhaoshenglong@huawei.com, xen-devel@lists.xen.org,
linux-arm-kernel@lists.infradead.org, david.vrabel@citrix.com
Subject: Re: [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI
Date: Tue, 29 Mar 2016 17:31:47 +0100 [thread overview]
Message-ID: <20160329163147.GB27223__28192.7664801062$1459269192$gmane$org@leverpostej> (raw)
In-Reply-To: <20160329161837.GH6745@arm.com>
On Tue, Mar 29, 2016 at 05:18:38PM +0100, Will Deacon wrote:
> On Thu, Mar 24, 2016 at 10:44:31PM +0800, Shannon Zhao wrote:
> > When it's a Xen domain0 booting with ACPI, it will supply a /chosen and
> > a /hypervisor node in DT. So check if it needs to enable ACPI.
> >
> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> > Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> > Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
> > ---
> > arch/arm64/kernel/acpi.c | 12 ++++++++----
> > 1 file changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> > index d1ce8e2..4e92be0 100644
> > --- a/arch/arm64/kernel/acpi.c
> > +++ b/arch/arm64/kernel/acpi.c
> > @@ -67,10 +67,13 @@ static int __init dt_scan_depth1_nodes(unsigned long node,
> > {
> > /*
> > * Return 1 as soon as we encounter a node at depth 1 that is
> > - * not the /chosen node.
> > + * not the /chosen node, or /hypervisor node when running on Xen.
> > */
> > - if (depth == 1 && (strcmp(uname, "chosen") != 0))
> > - return 1;
> > + if (depth == 1 && (strcmp(uname, "chosen") != 0)) {
> > + if (!xen_initial_domain() || (strcmp(uname, "hypervisor") != 0))
> > + return 1;
> > + }
>
> Hmm, but xen_initial_domain() is false when xen isn't being used at all,
> so it feels to me like this is a bit too far-reaching and is basically
> claiming the "/hypervisor" namespace for Xen. Couldn't it be renamed to
> "xen,hypervisor" or something?
>
> Mark, got any thoughts on this?
The node has a compatible string, "xen,xen" per [1], which would tell us
absolutely that xen is present. I'd be happy checking for that
explicitly.
In patch 11 fdt_find_hyper_node checks the compatible string. We could
factor that out into a helper like is_xen_node(node) and use it here
too.
If in future we want to do the same for other hypervisors we can add
explicit checks for their compatible strings and/or wrap that in a more
generic helper to cater for any hypervisor-specific details.
Thanks,
Mark.
[1] Documentation/devicetree/bindings/arm/xen.txt
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-03-29 16:31 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org>
2016-03-24 14:44 ` [PATCH v7 01/17] Xen: ACPI: Hide UART used by Xen Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn Shannon Zhao
2016-03-29 16:28 ` Julien Grall
[not found] ` <56FAAD48.2010401@arm.com>
2016-03-30 7:38 ` Shannon Zhao
[not found] ` <56FB8258.7030303@huawei.com>
2016-03-30 11:22 ` Julien Grall
[not found] ` <56FBB709.5050802@arm.com>
2016-03-30 12:42 ` Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 06/17] Xen: ARM: Add support for mapping platform device mmio Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 07/17] Xen: ARM: Add support for mapping AMBA " Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI Shannon Zhao
2016-03-29 16:35 ` Julien Grall
[not found] ` <56FAAEED.7060108@arm.com>
2016-03-30 7:34 ` Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 11/17] ARM: XEN: Move xen_early_init() before efi_init() Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 14/17] XEN: EFI: Move x86 specific codes to architecture directory Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 16/17] FDT: Add a helper to get the subnode by given name Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI Shannon Zhao
[not found] ` <1458830676-27075-2-git-send-email-shannon.zhao@linaro.org>
2016-03-24 15:08 ` [PATCH v7 01/17] Xen: ACPI: Hide UART used by Xen Rafael J. Wysocki
[not found] ` <CAJZ5v0iGHj1Hb3s=uJ34j0m88+3xtBQhbX47got=z1Ah_=LrkQ@mail.gmail.com>
2016-03-25 7:38 ` Shannon Zhao
2016-03-25 8:05 ` [PATCH v8 " Shannon Zhao
[not found] ` <1458893149-17388-1-git-send-email-zhaoshenglong@huawei.com>
2016-03-25 17:00 ` Rafael J. Wysocki
2016-03-25 17:15 ` Bjorn Helgaas
[not found] ` <7418231.W9aSFKr1zs@vostro.rjw.lan>
2016-03-26 13:14 ` Stefano Stabellini
[not found] ` <20160325171547.GB29822@localhost>
2016-03-26 12:44 ` Stefano Stabellini
2016-03-29 8:00 ` Shannon Zhao
2016-03-29 8:08 ` [RESEND PATCH v9 " Shannon Zhao
[not found] ` <1458830676-27075-12-git-send-email-shannon.zhao@linaro.org>
2016-03-26 12:54 ` [PATCH v7 11/17] ARM: XEN: Move xen_early_init() before efi_init() Stefano Stabellini
[not found] ` <alpine.DEB.2.02.1603261252510.18380@kaball.uk.xensource.com>
2016-03-29 16:07 ` Will Deacon
[not found] ` <20160329160756.GG6745@arm.com>
2016-03-31 11:12 ` Stefano Stabellini
[not found] ` <1458830676-27075-13-git-send-email-shannon.zhao@linaro.org>
2016-03-26 12:56 ` [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Stefano Stabellini
2016-03-29 16:18 ` Will Deacon
[not found] ` <20160329161837.GH6745@arm.com>
2016-03-29 16:31 ` Mark Rutland [this message]
[not found] ` <20160329163147.GB27223@leverpostej>
2016-03-30 7:19 ` Shannon Zhao
[not found] ` <56FB7E00.7030400@huawei.com>
2016-03-31 11:04 ` Stefano Stabellini
[not found] ` <alpine.DEB.2.02.1603311155450.11739@kaball.uk.xensource.com>
2016-03-31 11:44 ` Ard Biesheuvel
[not found] ` <CAKv+Gu-wPq_FzO3sm7bhSFuu7EVxHWB_v6HOn1GqNbdaE-iBoQ@mail.gmail.com>
2016-03-31 12:42 ` Mark Rutland
[not found] ` <20160331124216.GE26532@leverpostej>
2016-04-01 9:25 ` Shannon Zhao
[not found] ` <56FE3E85.60403@huawei.com>
2016-04-01 9:32 ` Shannon Zhao
[not found] ` <1458830676-27075-14-git-send-email-shannon.zhao@linaro.org>
2016-03-29 17:21 ` [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Julien Grall
[not found] <20160331144418.GR27408@perard.uk.xensource.com>
2016-03-31 15:21 ` [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Stefano Stabellini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='20160329163147.GB27223__28192.7664801062$1459269192$gmane$org@leverpostej' \
--to=mark.rutland@arm.com \
--cc=catalin.marinas@arm.com \
--cc=david.vrabel@citrix.com \
--cc=devicetree@vger.kernel.org \
--cc=julien.grall@arm.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=peter.huangpeng@huawei.com \
--cc=shannon.zhao@linaro.org \
--cc=stefano.stabellini@citrix.com \
--cc=will.deacon@arm.com \
--cc=xen-devel@lists.xen.org \
--cc=zhaoshenglong@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).