From: David Gibson <david@gibson.dropbear.id.au>
To: "Cédric Le Goater" <clg@kaod.org>
Cc: lvivier@redhat.com, aik@ozlabs.ru,
Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
qemu-devel@nongnu.org, groug@kaod.org, qemu-ppc@nongnu.org,
paulus@samba.org, philmd@redhat.com
Subject: Re: [PATCH v2 09/10] target/ppc: Correct RMLS table
Date: Wed, 8 Jan 2020 12:06:04 +1100 [thread overview]
Message-ID: <20200108010604.GI2137@umbus.fritz.box> (raw)
In-Reply-To: <b4f4b0f9-759d-637d-9b40-d0fd3c0c21f6@kaod.org>
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On Tue, Jan 07, 2020 at 03:21:42PM +0100, Cédric Le Goater wrote:
> On 1/7/20 5:48 AM, David Gibson wrote:
> > The table of RMA limits based on the LPCR[RMLS] field is slightly wrong.
> > We're missing the RMLS == 0 => 256 GiB RMA option, which is available on
> > POWER8, so add that.
>
> Where is this defined ?
It's in the Book4, so not easily available, unfortunately :(.
> > The comment that goes with the table is much more wrong. We *don't* filter
> > invalid RMLS values when writing the LPCR, and there's not really a
> > sensible way to do so. Furthermore, while in theory the set of RMLS values
> > is implementation dependent, it seems in practice the same set has been
> > available since around POWER4+ up until POWER8, the last model which
> > supports RMLS at all. So, correct that as well.
> >
> > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > ---
> > target/ppc/mmu-hash64.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
> > index bb9ebeaf48..e6f24be93e 100644
> > --- a/target/ppc/mmu-hash64.c
> > +++ b/target/ppc/mmu-hash64.c
> > @@ -760,12 +760,12 @@ static target_ulong rmls_limit(PowerPCCPU *cpu)
> > {
> > CPUPPCState *env = &cpu->env;
> > /*
> > - * This is the full 4 bits encoding of POWER8. Previous
> > - * CPUs only support a subset of these but the filtering
> > - * is done when writing LPCR
> > + * In theory the meanings of RMLS values are implementation
> > + * dependent. In practice, this seems to have been the set from
> > + * POWER4+..POWER8, and RMLS is no longer supported in POWER9.
> > */
> > const target_ulong rma_sizes[] = {
> > - [0] = 0,
> > + [0] = 256 * GiB,
> > [1] = 16 * GiB,
> > [2] = 1 * GiB,
> > [3] = 64 * MiB,
> >
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2020-01-08 2:06 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
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 [this message]
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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