From: Vladimir Murzin <vladimir.murzin@arm.com>
To: Christoffer Dall <christoffer.dall@linaro.org>
Cc: marc.zyngier@arm.com, andre.przywara@arm.com,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 7/7] ARM: KVM: Unlock vgic-v3 support
Date: Tue, 6 Sep 2016 14:23:16 +0100 [thread overview]
Message-ID: <57CEC344.7030706@arm.com> (raw)
In-Reply-To: <20160905112927.GL26366@cbox>
Sorry, missed this one
On 05/09/16 12:29, Christoffer Dall wrote:
>>
>> > +static bool __hyp_text __has_useable_gicv3_cpuif(void)
>> > +{
>> > + if (IS_ENABLED(CONFIG_ARM_GIC_V3) && (read_sysreg(ID_PFR1) >> 28))
> Do we have a define for bit 28 we could use?
I'll check it.
>
> Does this actually work on all v7 boards? The v7 ARM ARM seems to state
> that this bitfield is Reserved, UNK. Does that somehow mean 'is going
> to be zero'?
It is how v7ARM ARM I have defines UNK
An abbreviation indicating that software must treat a field as
containing an UNKNOWN value. Hardware must implement the bit as read as
0, or all 0s for a bit field. Software must not rely on the field
reading as zero.
It seems goes under 'is going to be zero' case, no?
Cheers
Vladimir
WARNING: multiple messages have this Message-ID (diff)
From: vladimir.murzin@arm.com (Vladimir Murzin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 7/7] ARM: KVM: Unlock vgic-v3 support
Date: Tue, 6 Sep 2016 14:23:16 +0100 [thread overview]
Message-ID: <57CEC344.7030706@arm.com> (raw)
In-Reply-To: <20160905112927.GL26366@cbox>
Sorry, missed this one
On 05/09/16 12:29, Christoffer Dall wrote:
>>
>> > +static bool __hyp_text __has_useable_gicv3_cpuif(void)
>> > +{
>> > + if (IS_ENABLED(CONFIG_ARM_GIC_V3) && (read_sysreg(ID_PFR1) >> 28))
> Do we have a define for bit 28 we could use?
I'll check it.
>
> Does this actually work on all v7 boards? The v7 ARM ARM seems to state
> that this bitfield is Reserved, UNK. Does that somehow mean 'is going
> to be zero'?
It is how v7ARM ARM I have defines UNK
An abbreviation indicating that software must treat a field as
containing an UNKNOWN value. Hardware must implement the bit as read as
0, or all 0s for a bit field. Software must not rely on the field
reading as zero.
It seems goes under 'is going to be zero' case, no?
Cheers
Vladimir
next prev parent reply other threads:[~2016-09-06 13:14 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-16 10:46 [PATCH v2 0/7] ARM: KVM: Support for vgic-v3 Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-08-16 10:46 ` [PATCH v2 1/7] arm64: KVM: Move GIC accessors to arch_gicv3.h Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:28 ` Christoffer Dall
2016-09-05 11:28 ` Christoffer Dall
2016-09-06 12:33 ` Vladimir Murzin
2016-09-06 12:33 ` Vladimir Murzin
2016-08-16 10:46 ` [PATCH v2 2/7] arm64: KVM: Move vgic-v3 save/restore to virt/kvm/arm/hyp Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-08-16 10:46 ` [PATCH v2 3/7] KVM: arm: vgic-new: improve compatibility with 32-bit Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:29 ` Christoffer Dall
2016-09-05 11:29 ` Christoffer Dall
2016-09-06 12:41 ` Vladimir Murzin
2016-09-06 12:41 ` Vladimir Murzin
2016-09-06 13:22 ` Christoffer Dall
2016-09-06 13:22 ` Christoffer Dall
2016-09-06 13:54 ` Vladimir Murzin
2016-09-06 13:54 ` Vladimir Murzin
2016-09-06 16:31 ` Christoffer Dall
2016-09-06 16:31 ` Christoffer Dall
2016-09-07 9:06 ` Vladimir Murzin
2016-09-07 9:06 ` Vladimir Murzin
2016-09-07 9:43 ` Christoffer Dall
2016-09-07 9:43 ` Christoffer Dall
2016-08-16 10:46 ` [PATCH v2 4/7] ARM: update MPIDR accessors macro Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:29 ` Christoffer Dall
2016-09-05 11:29 ` Christoffer Dall
2016-09-06 12:42 ` Vladimir Murzin
2016-09-06 12:42 ` Vladimir Murzin
2016-08-16 10:46 ` [PATCH v2 5/7] ARM: move system register accessors to asm/cp15.h Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:29 ` Christoffer Dall
2016-09-05 11:29 ` Christoffer Dall
2016-09-06 13:05 ` Vladimir Murzin
2016-09-06 13:05 ` Vladimir Murzin
2016-09-06 16:34 ` Christoffer Dall
2016-09-06 16:34 ` Christoffer Dall
2016-08-16 10:46 ` [PATCH v2 6/7] ARM: KVM: Get ready to use vgic-v3 Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:29 ` Christoffer Dall
2016-09-05 11:29 ` Christoffer Dall
2016-09-06 13:12 ` Vladimir Murzin
2016-09-06 13:12 ` Vladimir Murzin
2016-09-06 16:49 ` Christoffer Dall
2016-09-06 16:49 ` Christoffer Dall
2016-08-16 10:46 ` [PATCH v2 7/7] ARM: KVM: Unlock vgic-v3 support Vladimir Murzin
2016-08-16 10:46 ` Vladimir Murzin
2016-09-05 11:29 ` Christoffer Dall
2016-09-05 11:29 ` Christoffer Dall
2016-09-06 13:08 ` Marc Zyngier
2016-09-06 13:08 ` Marc Zyngier
2016-09-06 13:18 ` Vladimir Murzin
2016-09-06 13:18 ` Vladimir Murzin
2016-09-06 16:52 ` Christoffer Dall
2016-09-06 16:52 ` Christoffer Dall
2016-09-06 13:23 ` Vladimir Murzin [this message]
2016-09-06 13:23 ` Vladimir Murzin
2016-09-06 16:55 ` Christoffer Dall
2016-09-06 16:55 ` Christoffer Dall
2016-09-07 10:48 ` Vladimir Murzin
2016-09-07 10:48 ` Vladimir Murzin
2016-09-07 12:58 ` Christoffer Dall
2016-09-07 12:58 ` Christoffer Dall
2016-09-07 14:20 ` Peter Maydell
2016-09-07 14:20 ` Peter Maydell
2016-09-07 14:47 ` Christoffer Dall
2016-09-07 14:47 ` Christoffer Dall
2016-09-05 11:28 ` [PATCH v2 0/7] ARM: KVM: Support for vgic-v3 Christoffer Dall
2016-09-05 11:28 ` Christoffer Dall
2016-09-06 12:32 ` Vladimir Murzin
2016-09-06 12:32 ` Vladimir Murzin
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=57CEC344.7030706@arm.com \
--to=vladimir.murzin@arm.com \
--cc=andre.przywara@arm.com \
--cc=christoffer.dall@linaro.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=marc.zyngier@arm.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.