From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: kvm-ppc@vger.kernel.org,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Alexander Graf <agraf@suse.de>, KVM list <kvm@vger.kernel.org>
Subject: Re: [PATCH 27/27] KVM: PPC: Add Documentation about PV interface
Date: Sun, 04 Jul 2010 08:41:49 +1000 [thread overview]
Message-ID: <1278196909.4200.389.camel@pasglop> (raw)
In-Reply-To: <EB2E1C5B-118B-481B-83D6-44CFAA2E55D3@kernel.crashing.org>
On Fri, 2010-07-02 at 18:27 +0200, Segher Boessenkool wrote:
> > +To find out if we're running on KVM or not, we overlay the PVR
> > register. Usually
> > +the PVR register contains an id that identifies your CPU type. If,
> > however, you
> > +pass KVM_PVR_PARA in the register that you want the PVR result in,
> > the register
> > +still contains KVM_PVR_PARA after the mfpvr call.
> > +
> > + LOAD_REG_IMM(r5, KVM_PVR_PARA)
> > + mfpvr r5
> > + [r5 still contains KVM_PVR_PARA]
>
> I love this part :-)
Me not :-)
It should be in the device-tree instead, or something like that. Enough
games with PVR...
Ben.
> > + __u64 scratch3;
> > + __u64 critical; /* Guest may not get interrupts if == r1 */
> > + __u64 sprg0;
> > + __u64 sprg1;
> > + __u64 sprg2;
> > + __u64 sprg3;
> > + __u64 srr0;
> > + __u64 srr1;
> > + __u64 dar;
> > + __u64 msr;
> > + __u32 dsisr;
> > + __u32 int_pending; /* Tells the guest if we have an interrupt */
> > +};
> > +
> > +Additions to the page must only occur at the end. Struct fields
> > are always 32
> > +bit aligned.
>
> The u64s are 64-bit aligned, should they always be?
>
> > +The "ld" and "std" instructions are transormed to "lwz" and "stw"
> > instructions
> > +respectively on 32 bit systems with an added offset of 4 to
> > accomodate for big
> > +endianness.
>
> Will this add never overflow? Is there anything that checks for it?
>
> > +mtmsrd rX, 0 b <special mtmsr section>
> > +mtmsr b <special mtmsr section>
>
> mtmsr rX
>
>
> Segher
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
next prev parent reply other threads:[~2010-07-03 22:42 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 [this message]
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
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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