From: Alexander Graf <agraf@suse.de>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
KVM list <kvm@vger.kernel.org>,
kvm-ppc@vger.kernel.org
Subject: Re: [PATCH 27/27] KVM: PPC: Add Documentation about PV interface
Date: Fri, 2 Jul 2010 20:41:40 +0200 [thread overview]
Message-ID: <A98DA9FC-DC42-452E-BD44-5F86D1707BF0@suse.de> (raw)
In-Reply-To: <EB2E1C5B-118B-481B-83D6-44CFAA2E55D3@kernel.crashing.org>
On 02.07.2010, at 18:27, 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]
>=20
> I love this part :-)
:)
>=20
>> + __u64 scratch3;
>> + __u64 critical; /* Guest may not get interrupts if =3D=3D =
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.
>=20
> The u64s are 64-bit aligned, should they always be?
That's obvious, isn't it? And the ABI only specifies u64s to be 32 bit =
aligned, no? At least that's what ld and std specify.
>=20
>> +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.
>=20
> Will this add never overflow? Is there anything that checks for it?
It basically means that to access dar, we either do
ld rX, DAR(0)
or
lwz rX, DAR+4(0)
>=20
>> +mtmsrd rX, 0 b <special mtmsr section>
>> +mtmsr b <special mtmsr section>
>=20
> mtmsr rX
Nod.
Alex
next prev parent reply other threads:[~2010-07-02 18:41 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 [this message]
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
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
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=A98DA9FC-DC42-452E-BD44-5F86D1707BF0@suse.de \
--to=agraf@suse.de \
--cc=kvm-ppc@vger.kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=segher@kernel.crashing.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).