From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Alexander Graf <agraf@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>,
Paul Mackerras <paulus@samba.org>,
Alex Williamson <alex.williamson@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org
Subject: Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls
Date: Thu, 11 Jul 2013 12:56:17 +0000 [thread overview]
Message-ID: <51DEAB71.8020109@ozlabs.ru> (raw)
In-Reply-To: <4133424D-B105-4CB1-A72A-4F47A6184DC7@suse.de>
On 07/11/2013 10:51 PM, Alexander Graf wrote:
>
> On 11.07.2013, at 14:39, Benjamin Herrenschmidt wrote:
>
>> On Thu, 2013-07-11 at 13:15 +0200, Alexander Graf wrote:
>>> And that's bad. Jeez, seriously. Don't argue this case. We enable new
>>> features individually unless we're 100% sure we can keep everything
>>> working. In this case an ENABLE_CAP doesn't hurt at all, because user
>>> space still needs to handle the hypercalls if it wants them anyways.
>>> But you get debugging for free for example.
>>
>> An ENABLE_CAP is utterly pointless. More bloat. But you seem to like
>> it :-)
>
> I don't like bloat usually. But Alexey even had an #ifdef DEBUG in there
> to selectively disable in-kernel handling of multi-TCE. Not calling
> ENABLE_CAP would give him exactly that without ugly #ifdefs in the
> kernel.
No, it would not give m anithing. My ugly debug was to disable realmode
only and still leave virtual mode on, not to disable both real and virtual
modes. It is a lot easier to disable in kernel handling in QEMU.
--
Alexey
WARNING: multiple messages have this Message-ID (diff)
From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Alexander Graf <agraf@suse.de>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org,
Alex Williamson <alex.williamson@redhat.com>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls
Date: Thu, 11 Jul 2013 22:56:17 +1000 [thread overview]
Message-ID: <51DEAB71.8020109@ozlabs.ru> (raw)
In-Reply-To: <4133424D-B105-4CB1-A72A-4F47A6184DC7@suse.de>
On 07/11/2013 10:51 PM, Alexander Graf wrote:
>
> On 11.07.2013, at 14:39, Benjamin Herrenschmidt wrote:
>
>> On Thu, 2013-07-11 at 13:15 +0200, Alexander Graf wrote:
>>> And that's bad. Jeez, seriously. Don't argue this case. We enable new
>>> features individually unless we're 100% sure we can keep everything
>>> working. In this case an ENABLE_CAP doesn't hurt at all, because user
>>> space still needs to handle the hypercalls if it wants them anyways.
>>> But you get debugging for free for example.
>>
>> An ENABLE_CAP is utterly pointless. More bloat. But you seem to like
>> it :-)
>
> I don't like bloat usually. But Alexey even had an #ifdef DEBUG in there
> to selectively disable in-kernel handling of multi-TCE. Not calling
> ENABLE_CAP would give him exactly that without ugly #ifdefs in the
> kernel.
No, it would not give m anithing. My ugly debug was to disable realmode
only and still leave virtual mode on, not to disable both real and virtual
modes. It is a lot easier to disable in kernel handling in QEMU.
--
Alexey
WARNING: multiple messages have this Message-ID (diff)
From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Alexander Graf <agraf@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>,
Paul Mackerras <paulus@samba.org>,
Alex Williamson <alex.williamson@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org
Subject: Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls
Date: Thu, 11 Jul 2013 22:56:17 +1000 [thread overview]
Message-ID: <51DEAB71.8020109@ozlabs.ru> (raw)
In-Reply-To: <4133424D-B105-4CB1-A72A-4F47A6184DC7@suse.de>
On 07/11/2013 10:51 PM, Alexander Graf wrote:
>
> On 11.07.2013, at 14:39, Benjamin Herrenschmidt wrote:
>
>> On Thu, 2013-07-11 at 13:15 +0200, Alexander Graf wrote:
>>> And that's bad. Jeez, seriously. Don't argue this case. We enable new
>>> features individually unless we're 100% sure we can keep everything
>>> working. In this case an ENABLE_CAP doesn't hurt at all, because user
>>> space still needs to handle the hypercalls if it wants them anyways.
>>> But you get debugging for free for example.
>>
>> An ENABLE_CAP is utterly pointless. More bloat. But you seem to like
>> it :-)
>
> I don't like bloat usually. But Alexey even had an #ifdef DEBUG in there
> to selectively disable in-kernel handling of multi-TCE. Not calling
> ENABLE_CAP would give him exactly that without ugly #ifdefs in the
> kernel.
No, it would not give m anithing. My ugly debug was to disable realmode
only and still leave virtual mode on, not to disable both real and virtual
modes. It is a lot easier to disable in kernel handling in QEMU.
--
Alexey
next prev parent reply other threads:[~2013-07-11 12:56 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-06 15:06 [PATCH 0/8 v5] KVM: PPC: IOMMU in-kernel handling Alexey Kardashevskiy
2013-07-06 15:06 ` Alexey Kardashevskiy
2013-07-06 15:06 ` Alexey Kardashevskiy
2013-07-06 15:07 ` [PATCH 1/8] KVM: PPC: reserve a capability number for multitce support Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` [PATCH 2/8] KVM: PPC: reserve a capability and ioctl numbers for realmode VFIO Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` [PATCH 3/8] vfio: add external user support Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-08 21:52 ` Alex Williamson
2013-07-08 21:52 ` Alex Williamson
2013-07-08 21:52 ` Alex Williamson
2013-07-09 5:40 ` Alexey Kardashevskiy
2013-07-09 5:40 ` Alexey Kardashevskiy
2013-07-09 5:40 ` Alexey Kardashevskiy
2013-07-09 14:08 ` Alex Williamson
2013-07-09 14:08 ` Alex Williamson
2013-07-09 14:08 ` Alex Williamson
2013-07-06 15:07 ` [PATCH 4/8] powerpc: Prepare to support kernel handling of IOMMU map/unmap Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-08 1:33 ` Benjamin Herrenschmidt
2013-07-08 1:33 ` Benjamin Herrenschmidt
2013-07-08 1:33 ` Benjamin Herrenschmidt
2013-07-08 1:33 ` Benjamin Herrenschmidt
2013-07-09 15:54 ` Alexander Graf
2013-07-09 15:54 ` Alexander Graf
2013-07-09 15:54 ` Alexander Graf
2013-07-09 15:54 ` Alexander Graf
2013-07-06 15:07 ` [PATCH 5/8] powerpc: add real mode support for dma operations on powernv Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-08 4:44 ` [PATCH v2] " Alexey Kardashevskiy
2013-07-08 4:44 ` Alexey Kardashevskiy
2013-07-08 7:20 ` Benjamin Herrenschmidt
2013-07-08 7:20 ` Benjamin Herrenschmidt
2013-07-08 7:31 ` Alexey Kardashevskiy
2013-07-08 7:31 ` Alexey Kardashevskiy
2013-07-08 7:40 ` Benjamin Herrenschmidt
2013-07-08 7:40 ` Benjamin Herrenschmidt
2013-07-09 16:02 ` [PATCH 5/8] " Alexander Graf
2013-07-09 16:02 ` Alexander Graf
2013-07-09 16:02 ` Alexander Graf
2013-07-10 3:17 ` Alexey Kardashevskiy
2013-07-10 3:17 ` Alexey Kardashevskiy
2013-07-10 3:17 ` Alexey Kardashevskiy
2013-07-10 3:37 ` Benjamin Herrenschmidt
2013-07-10 3:37 ` Benjamin Herrenschmidt
2013-07-10 3:37 ` Benjamin Herrenschmidt
2013-07-06 15:07 ` [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-09 17:02 ` Alexander Graf
2013-07-09 17:02 ` Alexander Graf
2013-07-09 17:02 ` Alexander Graf
2013-07-10 5:00 ` Alexey Kardashevskiy
2013-07-10 5:00 ` Alexey Kardashevskiy
2013-07-10 5:00 ` Alexey Kardashevskiy
2013-07-10 10:05 ` Alexander Graf
2013-07-10 10:05 ` Alexander Graf
2013-07-10 10:05 ` Alexander Graf
2013-07-11 5:12 ` Alexey Kardashevskiy
2013-07-11 5:12 ` Alexey Kardashevskiy
2013-07-11 5:12 ` Alexey Kardashevskiy
2013-07-11 10:11 ` Alexander Graf
2013-07-11 10:11 ` Alexander Graf
2013-07-11 10:11 ` Alexander Graf
2013-07-11 10:54 ` Alexey Kardashevskiy
2013-07-11 10:54 ` Alexey Kardashevskiy
2013-07-11 10:54 ` Alexey Kardashevskiy
2013-07-11 11:15 ` Alexander Graf
2013-07-11 11:15 ` Alexander Graf
2013-07-11 11:15 ` Alexander Graf
2013-07-11 12:39 ` Benjamin Herrenschmidt
2013-07-11 12:39 ` Benjamin Herrenschmidt
2013-07-11 12:39 ` Benjamin Herrenschmidt
2013-07-11 12:51 ` Alexander Graf
2013-07-11 12:51 ` Alexander Graf
2013-07-11 12:51 ` Alexander Graf
2013-07-11 12:56 ` Alexey Kardashevskiy [this message]
2013-07-11 12:56 ` Alexey Kardashevskiy
2013-07-11 12:56 ` Alexey Kardashevskiy
2013-07-11 12:58 ` Benjamin Herrenschmidt
2013-07-11 12:58 ` Benjamin Herrenschmidt
2013-07-11 12:58 ` Benjamin Herrenschmidt
2013-07-11 13:13 ` Alexey Kardashevskiy
2013-07-11 13:13 ` Alexey Kardashevskiy
2013-07-11 13:13 ` Alexey Kardashevskiy
2013-07-11 13:21 ` Alexander Graf
2013-07-11 13:21 ` Alexander Graf
2013-07-11 13:21 ` Alexander Graf
2013-07-11 12:40 ` Benjamin Herrenschmidt
2013-07-11 12:40 ` Benjamin Herrenschmidt
2013-07-11 12:40 ` Benjamin Herrenschmidt
2013-07-11 12:38 ` Benjamin Herrenschmidt
2013-07-11 12:38 ` Benjamin Herrenschmidt
2013-07-11 12:38 ` Benjamin Herrenschmidt
2013-07-11 12:33 ` Benjamin Herrenschmidt
2013-07-11 12:33 ` Benjamin Herrenschmidt
2013-07-11 12:33 ` Benjamin Herrenschmidt
2013-07-11 13:11 ` Alexander Graf
2013-07-11 13:11 ` Alexander Graf
2013-07-11 13:11 ` Alexander Graf
2013-07-06 15:07 ` [PATCH 7/8] KVM: PPC: Add support for IOMMU in-kernel handling Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-09 17:06 ` Alexander Graf
2013-07-09 17:06 ` Alexander Graf
2013-07-09 17:06 ` Alexander Graf
2013-07-06 15:07 ` [PATCH 8/8] KVM: PPC: Add hugepage " Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-06 15:07 ` Alexey Kardashevskiy
2013-07-09 17:32 ` Alexander Graf
2013-07-09 17:32 ` Alexander Graf
2013-07-09 17:32 ` Alexander Graf
2013-07-09 23:29 ` Alexey Kardashevskiy
2013-07-09 23:29 ` Alexey Kardashevskiy
2013-07-09 23:29 ` Alexey Kardashevskiy
2013-07-10 10:33 ` Alexander Graf
2013-07-10 10:33 ` Alexander Graf
2013-07-10 10:33 ` Alexander Graf
2013-07-10 10:39 ` Benjamin Herrenschmidt
2013-07-10 10:39 ` Benjamin Herrenschmidt
2013-07-10 10:39 ` Benjamin Herrenschmidt
2013-07-10 10:40 ` Alexander Graf
2013-07-10 10:40 ` Alexander Graf
2013-07-10 10:40 ` Alexander Graf
2013-07-10 10:42 ` Alexander Graf
2013-07-10 10:42 ` Alexander Graf
2013-07-10 10:42 ` Alexander Graf
2013-07-11 8:57 ` Alexey Kardashevskiy
2013-07-11 8:57 ` Alexey Kardashevskiy
2013-07-11 8:57 ` Alexey Kardashevskiy
2013-07-11 9:52 ` Alexander Graf
2013-07-11 9:52 ` Alexander Graf
2013-07-11 9:52 ` Alexander Graf
2013-07-11 12:37 ` Benjamin Herrenschmidt
2013-07-11 12:37 ` Benjamin Herrenschmidt
2013-07-11 12:37 ` Benjamin Herrenschmidt
2013-07-11 12:50 ` Alexander Graf
2013-07-11 12:50 ` Alexander Graf
2013-07-11 12:50 ` Alexander Graf
2013-07-11 12:56 ` Benjamin Herrenschmidt
2013-07-11 12:56 ` Benjamin Herrenschmidt
2013-07-11 12:56 ` Benjamin Herrenschmidt
2013-07-11 13:41 ` chandrashekar shastri
2013-07-11 13:53 ` chandrashekar shastri
2013-07-11 13:41 ` chandrashekar shastri
2013-07-11 13:44 ` Alexander Graf
2013-07-11 13:44 ` Alexander Graf
2013-07-11 13:44 ` Alexander Graf
2013-07-11 13:46 ` Alexey Kardashevskiy
2013-07-11 13:46 ` Alexey Kardashevskiy
2013-07-11 13:46 ` Alexey Kardashevskiy
-- strict thread matches above, loose matches on Subject: below --
2013-06-27 5:02 [PATCH 0/8 v4] KVM: PPC: " Alexey Kardashevskiy
2013-06-27 5:02 ` [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls Alexey Kardashevskiy
2013-06-27 5:02 ` Alexey Kardashevskiy
2013-06-27 5:02 ` Alexey Kardashevskiy
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=51DEAB71.8020109@ozlabs.ru \
--to=aik@ozlabs.ru \
--cc=agraf@suse.de \
--cc=alex.williamson@redhat.com \
--cc=benh@kernel.crashing.org \
--cc=david@gibson.dropbear.id.au \
--cc=kvm-ppc@vger.kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=paulus@samba.org \
/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.