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From: Alexander Graf <agraf@suse.de>
To: Scott Wood <scottwood@freescale.com>
Cc: KVM list <kvm@vger.kernel.org>,
	kvm-ppc@vger.kernel.org, Dan Hettena <danh@ghs.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Hollis Blanchard <hollis@penguinppc.org>
Subject: Re: [PATCH 27/27] KVM: PPC: Add Documentation about PV interface
Date: Sun, 4 Jul 2010 11:02:16 +0200	[thread overview]
Message-ID: <02965CC4-D0E5-4689-8F39-0F9636B88B07@suse.de> (raw)
In-Reply-To: <20100702141003.75302a9a@schlenkerla.am.freescale.net>


On 02.07.2010, at 21:10, Scott Wood wrote:

> On Fri, 2 Jul 2010 20:47:44 +0200
> Alexander Graf <agraf@suse.de> wrote:
>=20
>>=20
>> On 02.07.2010, at 19:59, Hollis Blanchard wrote:
>>=20
>>> [Resending...]
>>>=20
>>> Please reconcile this with
>>> http://www.linux-kvm.org/page/PowerPC_Hypercall_ABI, which has been
>>> discussed in the (admittedly closed) Power.org embedded hypervisor
>>> working group. Bear in mind that other hypervisors are already
>>> implementing the documented ABI, so if you have concerns, you should
>>> probably raise them with that audience...
>>=20
>> We can not use sc with LV=3D1 because that would break the KVM in
>> something else case which is KVM's strong point on PPC.
>=20
> The current proposal involves the hypervisor specifying the hcall =
opcode
> sequence in the device tree -- to allow either "sc 1" or "sc 0 plus
> magic GPR" depending on whether you've got the hardware hypervisor
> feature (hereafter HHV).

Ah right, so you can still trap a hypercall with HHV. Makes sense.

>=20
> With HHV, "sc 0 plus magic GPR" just doesn't work, since it won't trap
> to the hypervisor.  "sc 1 plus magic GPR" might be problematic on some
> non-HHV implementations, especially if you *do* have HHV but the
> non-HHV hypervisor is running as an HHV guest.

Yes, that's why I need sc 0 plus magic GPR in r0 and r3 - to accomodate =
for all the non-HHV cases. And it would be clever to have a way to =
expose the same functionality when we do use the HHV features.

So, is that draft available anywhere? The wiki page Hollis pointed to is =
very vague.


Alex

  reply	other threads:[~2010-07-04  9:02 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-01 10:42 [PATCH 00/27] KVM PPC PV framework Alexander Graf
2010-07-01 10:42 ` [PATCH 01/27] KVM: PPC: Introduce shared page Alexander Graf
2010-07-01 10:42 ` [PATCH 02/27] KVM: PPC: Convert MSR to " Alexander Graf
2010-07-01 10:42 ` [PATCH 03/27] KVM: PPC: Convert DSISR " Alexander Graf
2010-07-01 10:42 ` [PATCH 04/27] KVM: PPC: Convert DAR " Alexander Graf
2010-07-01 10:42 ` [PATCH 05/27] KVM: PPC: Convert SRR0 and SRR1 " Alexander Graf
2010-07-01 10:42 ` [PATCH 06/27] KVM: PPC: Convert SPRG[0-4] " Alexander Graf
2010-07-01 10:42 ` [PATCH 07/27] KVM: PPC: Implement hypervisor interface Alexander Graf
2010-07-01 10:42 ` [PATCH 08/27] KVM: PPC: Add PV guest critical sections Alexander Graf
2010-07-01 10:42 ` [PATCH 09/27] KVM: PPC: Add PV guest scratch registers Alexander Graf
2010-07-01 10:42 ` [PATCH 10/27] KVM: PPC: Tell guest about pending interrupts Alexander Graf
2010-07-01 10:42 ` [PATCH 11/27] KVM: PPC: Make RMO a define Alexander Graf
2010-07-02 16:23   ` Segher Boessenkool
2010-07-01 10:42 ` [PATCH 12/27] KVM: PPC: First magic page steps Alexander Graf
2010-07-01 10:42 ` [PATCH 13/27] KVM: PPC: Magic Page Book3s support Alexander Graf
2010-07-02 15:37   ` Alexander Graf
2010-07-04  9:42     ` Avi Kivity
2010-07-01 10:42 ` [PATCH 14/27] KVM: PPC: Magic Page BookE support Alexander Graf
2010-07-01 11:18   ` Josh Boyer
2010-07-01 12:25     ` Alexander Graf
2010-07-12 11:24   ` Liu Yu-B13201
2010-07-01 10:42 ` [PATCH 15/27] KVM: PPC: Expose magic page support to guest Alexander Graf
2010-07-01 10:42 ` [PATCH 16/27] KVM: Move kvm_guest_init out of generic code Alexander Graf
2010-07-02  7:41   ` Geert Uytterhoeven
2010-07-02  7:44     ` Alexander Graf
2010-07-01 10:42 ` [PATCH 17/27] KVM: PPC: Generic KVM PV guest support Alexander Graf
2010-07-01 10:42 ` [PATCH 18/27] KVM: PPC: KVM PV guest stubs Alexander Graf
2010-07-01 10:42 ` [PATCH 19/27] KVM: PPC: PV instructions to loads and stores Alexander Graf
2010-07-01 10:42 ` [PATCH 20/27] KVM: PPC: PV tlbsync to nop Alexander Graf
2010-07-01 10:42 ` [PATCH 21/27] KVM: PPC: Introduce kvm_tmp framework Alexander Graf
2010-07-01 10:42 ` [PATCH 22/27] KVM: PPC: Introduce branch patching helper Alexander Graf
2010-07-01 10:42 ` [PATCH 23/27] KVM: PPC: PV assembler helpers Alexander Graf
2010-07-01 10:42 ` [PATCH 24/27] KVM: PPC: PV mtmsrd L=1 Alexander Graf
2010-07-01 10:43 ` [PATCH 25/27] KVM: PPC: PV mtmsrd L=0 and mtmsr Alexander Graf
2010-07-01 10:43 ` [PATCH 26/27] KVM: PPC: PV wrteei Alexander Graf
2010-07-01 10:43 ` [PATCH 27/27] KVM: PPC: Add Documentation about PV interface Alexander Graf
2010-07-02 16:27   ` Segher Boessenkool
2010-07-02 18:41     ` Alexander Graf
2010-07-03 22:42       ` Benjamin Herrenschmidt
2010-07-04  9:04         ` Alexander Graf
2010-07-03 22:41     ` Benjamin Herrenschmidt
2010-07-04  9:04       ` Alexander Graf
2010-07-04  9:10         ` Avi Kivity
2010-07-04  9:17           ` Alexander Graf
2010-07-04  9:30             ` Alexander Graf
2010-07-04  9:41               ` Avi Kivity
2010-07-04  9:37             ` Avi Kivity
2010-07-02 17:59   ` Hollis Blanchard
2010-07-02 18:47     ` Alexander Graf
2010-07-02 19:10       ` Scott Wood
2010-07-04  9:02         ` Alexander Graf [this message]
2010-07-09  9:11   ` MJ embd
2010-07-09  9:15     ` Alexander Graf
2010-07-02 16:22 ` [PATCH 00/27] KVM PPC PV framework Segher Boessenkool
2010-07-02 16:59   ` Alexander Graf
2010-07-09  4:57 ` MJ embd
2010-07-09  6:33   ` Alexander Graf

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