From: Paolo Bonzini <pbonzini@redhat.com>
To: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Ian Campbell <ian.campbell@citrix.com>,
kvm-devel <kvm@vger.kernel.org>,
Michael Casadevall <Michael.casadevall@linaro.org>,
"marc.zyngier@arm.com" <marc.zyngier@arm.com>,
Rob Herring <rob.herring@linaro.org>,
"cross-distro@lists.linaro.org" <cross-distro@lists.linaro.org>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
Stefano Stabellini <stefano.stabellini@citrix.com>,
Christopher Covington <cov@codeaurora.org>,
Grant Likely <grant.likely@linaro.org>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC v2] ARM VM System Specification
Date: Wed, 11 Jun 2014 10:16:03 +0200 [thread overview]
Message-ID: <53981043.3010300__1258.39385805211$1402474717$gmane$org@redhat.com> (raw)
In-Reply-To: <20140611065412.GA24286@lvm>
Il 11/06/2014 08:54, Christoffer Dall ha scritto:
> The problem is that the most common user problem with ARM VMs are that
> they boot the thing, and then get no output. So we wanted some way to
> make sure we know that the kernel should be able to print to a console.
>
> UEFI does provide DBG2 output, but that's only during boot time service
> (so I'm told), and we need to mandate something that will work when
> the kernel boots.
Doh, indeed the console is not part of run-time services (so it's not
even available for earlyprintk).
> If kernels actually do use the UEFI runtime services and have no need
> for direct access to an RTC when runing in a UEFI compliant system, then
> I agree with not specifying the hardware details.
The RTC is not needed for ordinary operation of the kernel and, in the
current kernel, the EFI RTC driver is only used for IA64. However, it
seems to be platform independent. I'll give it a shot (on x86, since
that's the only architecture for which I know how to get UEFI firmware).
Paolo
next prev parent reply other threads:[~2014-06-11 8:16 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-28 18:45 [RFC v2] ARM VM System Specification Christoffer Dall
2014-03-28 18:45 ` Christoffer Dall
2014-03-30 22:10 ` Olof Johansson
2014-03-30 22:10 ` Olof Johansson
2014-03-30 22:10 ` Olof Johansson
2014-03-31 17:26 ` Christoffer Dall
2014-03-31 17:26 ` Christoffer Dall
2014-03-31 17:26 ` Christoffer Dall
2014-04-01 9:49 ` Ian Campbell
2014-04-01 9:49 ` Ian Campbell
2014-04-01 9:49 ` Ian Campbell
2014-04-01 9:57 ` Michael Casadevall
2014-04-01 9:57 ` Michael Casadevall
2014-04-01 9:57 ` Michael Casadevall
2014-04-01 10:16 ` Grant Likely
2014-04-01 10:16 ` Grant Likely
2014-04-01 10:16 ` Grant Likely
2014-04-29 14:42 ` Christoffer Dall
2014-04-29 14:42 ` Christoffer Dall
2014-04-29 14:42 ` Christoffer Dall
2014-04-30 8:14 ` Grant Likely
2014-04-30 8:14 ` Grant Likely
2014-04-30 8:14 ` Grant Likely
2014-06-10 14:42 ` Peter Maydell
2014-06-10 14:42 ` Peter Maydell
2014-06-10 14:42 ` Peter Maydell
2014-06-10 15:03 ` Ian Campbell
2014-06-10 15:03 ` Ian Campbell
2014-06-10 15:03 ` Ian Campbell
2014-06-10 17:00 ` Paolo Bonzini
2014-06-10 17:00 ` Paolo Bonzini
2014-06-10 17:00 ` Paolo Bonzini
2014-06-10 17:04 ` Christopher Covington
2014-06-10 17:04 ` Christopher Covington
2014-06-10 17:04 ` Christopher Covington
2014-06-10 18:08 ` Peter Maydell
2014-06-10 18:08 ` Peter Maydell
2014-06-10 18:08 ` Peter Maydell
2014-06-10 18:56 ` Paolo Bonzini
2014-06-10 18:56 ` Paolo Bonzini
2014-06-10 18:56 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-10 19:18 ` Paolo Bonzini
2014-06-11 6:54 ` Christoffer Dall
2014-06-11 6:54 ` Christoffer Dall
2014-06-11 6:54 ` Christoffer Dall
2014-06-11 8:16 ` Paolo Bonzini [this message]
2014-06-11 8:16 ` Paolo Bonzini
2014-06-11 8:16 ` Paolo Bonzini
2014-06-11 9:06 ` Arnd Bergmann
2014-06-11 9:06 ` Arnd Bergmann
2014-06-11 9:06 ` Arnd Bergmann
2014-06-30 16:19 ` Jon Masters
2014-06-30 16:19 ` Jon Masters
2014-06-30 16:19 ` Jon Masters
2014-06-30 20:46 ` Christoffer Dall
2014-06-30 20:46 ` Christoffer Dall
2014-06-30 21:14 ` Peter Maydell
2014-06-30 21:14 ` Peter Maydell
2014-06-30 21:14 ` Peter Maydell
2014-07-01 17:03 ` Stefano Stabellini
2014-07-01 17:03 ` Stefano Stabellini
2014-07-01 17:10 ` Peter Maydell
2014-07-01 17:10 ` Peter Maydell
2014-07-01 17:10 ` Peter Maydell
2014-07-02 10:13 ` Christoffer Dall
2014-07-02 10:13 ` Christoffer Dall
2014-07-02 10:13 ` Christoffer Dall
2014-07-01 17:03 ` Stefano Stabellini
2014-06-30 20:46 ` Christoffer Dall
2014-06-11 11:33 ` Grant Likely
2014-06-11 11:33 ` Grant Likely
2014-06-11 11:58 ` Arnd Bergmann
2014-06-11 11:58 ` Arnd Bergmann
2014-06-11 11:58 ` Arnd Bergmann
2014-06-11 12:02 ` Grant Likely
2014-06-11 12:02 ` Grant Likely
2014-06-11 12:02 ` Grant Likely
2014-06-11 14:14 ` Peter Maydell
2014-06-11 14:14 ` Peter Maydell
2014-06-11 14:14 ` Peter Maydell
2014-06-11 11:33 ` Grant Likely
2014-06-10 16:44 ` Claudio Fontana
2014-06-10 16:44 ` Claudio Fontana
2014-06-10 16:44 ` Claudio Fontana
2014-06-10 19:21 ` Arnd Bergmann
2014-06-10 19:21 ` Arnd Bergmann
2014-06-10 19:21 ` Arnd Bergmann
2014-06-11 9:50 ` Stefano Stabellini
2014-06-11 9:50 ` Stefano Stabellini
2014-06-11 9:50 ` Stefano Stabellini
2014-06-11 9:55 ` Christoffer Dall
2014-06-11 9:55 ` Christoffer Dall
2014-06-11 11:28 ` Grant Likely
2014-06-11 11:28 ` Grant Likely
2014-06-11 11:28 ` Grant Likely
2014-06-11 12:04 ` Christoffer Dall
2014-06-11 12:04 ` Christoffer Dall
2014-06-11 12:04 ` Christoffer Dall
2014-06-11 9:55 ` Christoffer Dall
2014-06-11 10:27 ` Arnd Bergmann
2014-06-11 10:27 ` Arnd Bergmann
2014-06-11 10:27 ` Arnd Bergmann
2014-06-11 11:22 ` Grant Likely
2014-06-11 11:22 ` Grant Likely
2014-06-11 11:22 ` Grant Likely
2014-03-28 18:45 Christoffer Dall
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