From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Christoffer Dall <christoffer.dall@linaro.org>,
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>
Subject: Re: [RFC v2] ARM VM System Specification
Date: Wed, 11 Jun 2014 11:06:45 +0200 [thread overview]
Message-ID: <9801429.iblEns5zC3@wuerfel> (raw)
In-Reply-To: <53981043.3010300@redhat.com>
On Wednesday 11 June 2014 10:16:03 Paolo Bonzini wrote:
>
> > 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).
Using the EFI RTC seems appropriate for ARM, as it's a reasonable
abstraction that should work with any hypervisor. I suspect the only
reason we don't use it on x86 is that we know which RTC hardware we
have and the kernel comes with a mandatory driver already.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC v2] ARM VM System Specification
Date: Wed, 11 Jun 2014 11:06:45 +0200 [thread overview]
Message-ID: <9801429.iblEns5zC3@wuerfel> (raw)
In-Reply-To: <53981043.3010300@redhat.com>
On Wednesday 11 June 2014 10:16:03 Paolo Bonzini wrote:
>
> > 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).
Using the EFI RTC seems appropriate for ARM, as it's a reasonable
abstraction that should work with any hypervisor. I suspect the only
reason we don't use it on x86 is that we know which RTC hardware we
have and the kernel comes with a mandatory driver already.
Arnd
next prev parent reply other threads:[~2014-06-11 9:07 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
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 [this message]
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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