From: Richard Henderson <richard.henderson@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-devel@nongnu.org, qemu-arm@nongnu.org
Subject: Re: [PATCH v4 13/24] target/arm: Add ptw_idx to S1Translate
Date: Thu, 20 Oct 2022 13:16:35 +1000 [thread overview]
Message-ID: <e432447d-8a5e-4229-feab-582aa16f0f14@linaro.org> (raw)
In-Reply-To: <CAFEAcA_Vdc2Cxvwnd_tc7ik_-NMXk_z0URsV=r7eGYy3bqhstg@mail.gmail.com>
On 10/17/22 20:01, Peter Maydell wrote:
> On Tue, 11 Oct 2022 at 04:30, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> Hoist the computation of the mmu_idx for the ptw up to
>> get_phys_addr_with_struct and get_phys_addr_twostage.
>> This removes the duplicate check for stage2 disabled
>> from the middle of the walk, performing it only once.
>>
>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>> ---
>> + if (!nstable) {
>> + /* Stage2_S -> Stage2 or Phys_S -> Phys_NS */
>> + ptw->in_ptw_idx &= ~1;
>> + ptw->in_secure = false;
>> + }
>
> I feel like this bitwise manipulation of the mmuidx values
> is leaving a landmine for any future re-organization of
> our mmuidx use. Can we do this just using the symbolic
> constant values?
I can't think of a way with just symbolic values,
but I can add BUILD_BUG_ON to validate expectations,
so that it's not a *hidden* landmine. :-)
r~
next prev parent reply other threads:[~2022-10-20 3:23 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-11 3:18 [PATCH v4 00/24] target/arm: Implement FEAT_HAFDBS Richard Henderson
2022-10-11 3:18 ` [PATCH v4 01/24] target/arm: Enable TARGET_PAGE_ENTRY_EXTRA Richard Henderson
2022-10-11 3:18 ` [PATCH v4 02/24] target/arm: Use probe_access_full for MTE Richard Henderson
2022-10-11 3:18 ` [PATCH v4 03/24] target/arm: Use probe_access_full for BTI Richard Henderson
2022-10-11 3:18 ` [PATCH v4 04/24] target/arm: Add ARMMMUIdx_Phys_{S,NS} Richard Henderson
2022-10-11 3:18 ` [PATCH v4 05/24] target/arm: Move ARMMMUIdx_Stage2 to a real tlb mmu_idx Richard Henderson
2022-10-14 18:09 ` Peter Maydell
2022-10-11 3:18 ` [PATCH v4 06/24] target/arm: Restrict tlb flush from vttbr_write to vmid change Richard Henderson
2022-10-14 18:12 ` Peter Maydell
2022-10-11 3:18 ` [PATCH v4 07/24] target/arm: Split out S1Translate type Richard Henderson
2022-10-17 9:53 ` Peter Maydell
2022-10-11 3:18 ` [PATCH v4 08/24] target/arm: Plumb debug into S1Translate Richard Henderson
2022-10-11 3:18 ` [PATCH v4 09/24] target/arm: Move be test for regime into S1TranslateResult Richard Henderson
2022-10-11 3:18 ` [PATCH v4 10/24] target/arm: Use softmmu tlbs for page table walking Richard Henderson
2022-10-11 3:18 ` [PATCH v4 11/24] target/arm: Split out get_phys_addr_twostage Richard Henderson
2022-10-11 3:18 ` [PATCH v4 12/24] target/arm: Use bool consistently for get_phys_addr subroutines Richard Henderson
2022-10-11 3:19 ` [PATCH v4 13/24] target/arm: Add ptw_idx to S1Translate Richard Henderson
2022-10-17 10:01 ` Peter Maydell
2022-10-20 3:16 ` Richard Henderson [this message]
2022-10-11 3:19 ` [PATCH v4 14/24] target/arm: Add isar predicates for FEAT_HAFDBS Richard Henderson
2022-10-11 3:19 ` [PATCH v4 15/24] target/arm: Extract HA and HD in aa64_va_parameters Richard Henderson
2022-10-11 3:19 ` [PATCH v4 16/24] target/arm: Move S1_ptw_translate outside arm_ld[lq]_ptw Richard Henderson
2022-10-11 3:19 ` [PATCH v4 17/24] target/arm: Add ARMFault_UnsuppAtomicUpdate Richard Henderson
2022-10-11 3:19 ` [PATCH v4 18/24] target/arm: Remove loop from get_phys_addr_lpae Richard Henderson
2022-10-11 3:19 ` [PATCH v4 19/24] target/arm: Fix fault reporting in get_phys_addr_lpae Richard Henderson
2022-10-11 3:19 ` [PATCH v4 20/24] target/arm: Don't shift attrs " Richard Henderson
2022-10-11 3:19 ` [PATCH v4 21/24] target/arm: Consider GP an attribute " Richard Henderson
2022-10-11 3:19 ` [PATCH v4 22/24] target/arm: Implement FEAT_HAFDBS, access flag portion Richard Henderson
2022-10-17 10:45 ` Peter Maydell
2022-10-11 3:19 ` [PATCH v4 23/24] target/arm: Implement FEAT_HAFDBS, dirty bit portion Richard Henderson
2022-10-17 11:01 ` Peter Maydell
2022-10-11 3:19 ` [PATCH v4 24/24] target/arm: Use the max page size in a 2-stage ptw Richard Henderson
2022-10-17 12:49 ` [PATCH v4 00/24] target/arm: Implement FEAT_HAFDBS Peter Maydell
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