From: Thomas Huth <thuth@redhat.com>
To: BALATON Zoltan <balaton@eik.bme.hu>, Greg Kurz <groug@kaod.org>
Cc: lvivier@redhat.com, qemu-devel@nongnu.org, paulus@samba.org,
clg@kaod.org, qemu-ppc@nongnu.org, philmd@redhat.com,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH v2 02/10] ppc: Remove stub of PPC970 HID4 implementation
Date: Wed, 8 Jan 2020 09:29:56 +0100 [thread overview]
Message-ID: <d4211f26-0b85-aebb-9ce6-53411a3c0992@redhat.com> (raw)
In-Reply-To: <alpine.BSF.2.21.99999.352.2001071900510.93471@zero.eik.bme.hu>
On 07/01/2020 19.05, BALATON Zoltan wrote:
> On Tue, 7 Jan 2020, Greg Kurz wrote:
>> On Tue, 7 Jan 2020 18:32:15 +0100
>> Greg Kurz <groug@kaod.org> wrote:
>>
>>> On Tue, 7 Jan 2020 15:48:19 +1100
>>> David Gibson <david@gibson.dropbear.id.au> wrote:
>>>
>>>> The PowerPC 970 CPU was a cut-down POWER4, which had hypervisor
>>>> capability.
>>>> However, it can be (and often was) strapped into "Apple mode", where
>>>> the
>>>> hypervisor capabilities were disabled (essentially putting it always in
>>>> hypervisor mode).
>>
>> Isn't it supervisor mode instead of hypervisor mode ?
>
> By the way, do you know if this strapping is hardware or software based?
> So is it the firmware that disables it on Apple hardware or is it some
> CPU pin connected somewhere on the motherboard or it's within the CPU
> and cannot be changed? I wonder if it's theoretically possible to
> re-enable it on an Apple G5 or we would likely never see a PowerPC 970
> with HV enabled?
I don't know how Apple disabled it, but you can buy a used Terrasoft YDL
PowerStation if you want to see it in action.
Thomas
next prev parent reply other threads:[~2020-01-08 8:33 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-07 4:48 [PATCH v2 00/10] target/ppc: Correct some errors with real mode handling David Gibson
2020-01-07 4:48 ` [PATCH v2 01/10] ppc: Drop PPC_EMULATE_32BITS_HYPV stub David Gibson
2020-01-07 12:52 ` Cédric Le Goater
2020-01-07 17:05 ` Greg Kurz
2020-01-07 4:48 ` [PATCH v2 02/10] ppc: Remove stub of PPC970 HID4 implementation David Gibson
2020-01-07 12:51 ` Cédric Le Goater
2020-01-07 17:32 ` Greg Kurz
2020-01-07 17:36 ` Greg Kurz
2020-01-07 18:05 ` BALATON Zoltan
2020-01-08 1:09 ` David Gibson
2020-01-08 8:29 ` Thomas Huth [this message]
2020-01-08 1:08 ` David Gibson
2020-01-08 8:11 ` Greg Kurz
2020-01-08 2:17 ` Paul Mackerras
2020-01-08 13:35 ` Greg Kurz
2020-01-07 4:48 ` [PATCH v2 03/10] target/ppc: Correct handling of real mode accesses with vhyp on hash MMU David Gibson
2020-01-14 10:22 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 04/10] target/ppc: Introduce ppc_hash64_use_vrma() helper David Gibson
2020-01-07 13:24 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 05/10] spapr, ppc: Remove VPM0/RMLS hacks for POWER9 David Gibson
2020-01-07 14:35 ` Cédric Le Goater
2020-01-09 7:33 ` Alexey Kardashevskiy
2020-01-13 3:38 ` David Gibson
2020-01-07 4:48 ` [PATCH v2 06/10] target/ppc: Remove RMOR register from POWER9 & POWER10 David Gibson
2020-01-07 13:39 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 07/10] target/ppc: Use class fields to simplify LPCR masking David Gibson
2020-01-07 13:41 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 08/10] target/ppc: Streamline calculation of RMA limit from LPCR[RMLS] David Gibson
2020-01-07 13:43 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 09/10] target/ppc: Correct RMLS table David Gibson
2020-01-07 14:21 ` Cédric Le Goater
2020-01-08 1:06 ` David Gibson
2020-01-08 8:29 ` Cédric Le Goater
2020-01-09 7:46 ` Alexey Kardashevskiy
2020-01-13 3:46 ` David Gibson
2020-01-08 8:28 ` Cédric Le Goater
2020-01-07 4:48 ` [PATCH v2 10/10] target/ppc: Only calculate RMLS derived RMA limit on demand David Gibson
2020-01-08 8:31 ` Cédric Le Goater
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