From: "Cédric Le Goater" <clg@kaod.org>
To: David Gibson <david@gibson.dropbear.id.au>,
qemu-devel@nongnu.org, groug@kaod.org, philmd@redhat.com
Cc: aik@ozlabs.ru, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
qemu-ppc@nongnu.org, lvivier@redhat.com, paulus@samba.org
Subject: Re: [PATCH v2 09/10] target/ppc: Correct RMLS table
Date: Tue, 7 Jan 2020 15:21:42 +0100 [thread overview]
Message-ID: <b4f4b0f9-759d-637d-9b40-d0fd3c0c21f6@kaod.org> (raw)
In-Reply-To: <20200107044827.471355-10-david@gibson.dropbear.id.au>
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 ?
C.
>
> 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,
>
next prev parent reply other threads:[~2020-01-07 14:23 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 [this message]
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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