From: "Jan Beulich" <JBeulich@suse.com>
To: Stefano Stabellini <email@example.com>,
Shannon Zhao <firstname.lastname@example.org>
Christoffer Dall <email@example.com>,
Shannon Zhao <firstname.lastname@example.org>
Subject: Re: Runtime services support for Xen on ARM
Date: Tue, 10 Nov 2015 06:12:39 -0700 [thread overview]
Message-ID: <5641FB5702000078000B361F@prv-mh.provo.novell.com> (raw)
>>> On 10.11.15 at 13:26, <email@example.com> wrote:
> CC'ing xen-devel and Jan
> On Tue, 10 Nov 2015, Shannon Zhao wrote:
>> Hi Stefano,
>> I'm working on adding Runtime services support at Xen side. Most of work
>> is adding the ARM part in xen/common/efi/runtime.c.
>> There is one problem which block me. That is how to implement
>> efi_rs_enter() and efi_rs_leave() for ARM, since I think current
>> implementation is x86 specific and won't work on ARM. Also the rtc_lock.
>> Could you give some suggestion? Thanks!
> efi_rs_enter() and efi_rs_leave() look very PV x86 specific. It is
> possible that we don't actually need to do anything at all on ARM, aside
> from refactoring the code. Jan?
Whether you need to do much on ARM I don't know; doing
nothing doesn't seem to be among the options though, as at the
very least you need to acquire/release efi_rs_lock. The fact that
the code will need refactoring has been well known since the time
it got made common.
> Similarly we don't have an rtc_lock spinlock today and it is not
> actually needed, but for the sake of keeping the common code common, I
> would just introduce rtc_lock on ARM too.
I think this would better be hidden behind an arch abstraction,
doing nothing on ARM.
prev parent reply other threads:[~2015-11-10 13:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5641D5F0.firstname.lastname@example.org>
2015-11-10 12:26 ` Runtime services support for Xen on ARM Stefano Stabellini
2015-11-10 12:36 ` Ian Campbell
2015-11-10 14:27 ` Shannon Zhao
2015-11-12 9:06 ` Shannon Zhao
2015-11-12 11:04 ` Jan Beulich
2015-11-12 12:52 ` Shannon Zhao
2015-11-12 15:29 ` Jan Beulich
2015-11-10 13:12 ` Jan Beulich [this message]
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