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 10/10] target/ppc: Only calculate RMLS derived RMA limit on demand
Date: Wed, 8 Jan 2020 09:31:21 +0100 [thread overview]
Message-ID: <01aa0955-570e-7e7b-c773-2d05611f62c1@kaod.org> (raw)
In-Reply-To: <20200107044827.471355-11-david@gibson.dropbear.id.au>
On 1/7/20 5:48 AM, David Gibson wrote:
> When the LPCR is written, we update the env->rmls field with the RMA limit
> it implies. Simplify things by just calculating the value directly from
> the LPCR value when we need it.
>
> It's possible this is a little slower, but it's unlikely to be significant,
> since this is only for real mode accesses in a translation configuration
> that's not used very often, and the whole thing is behind the qemu TLB
> anyway. Therefore, keeping the number of state variables down and not
> having to worry about making sure it's always in sync seems the better
> option.
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
> ---
> target/ppc/cpu.h | 1 -
> target/ppc/mmu-hash64.c | 8 +++++---
> 2 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> index 2de9e2fa2b..2a79b97bd8 100644
> --- a/target/ppc/cpu.h
> +++ b/target/ppc/cpu.h
> @@ -1075,7 +1075,6 @@ struct CPUPPCState {
> uint64_t insns_flags2;
> #if defined(TARGET_PPC64)
> ppc_slb_t vrma_slb;
> - target_ulong rmls;
> #endif
>
> int error_code;
> diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
> index e6f24be93e..170a78bd2e 100644
> --- a/target/ppc/mmu-hash64.c
> +++ b/target/ppc/mmu-hash64.c
> @@ -842,8 +842,10 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
>
> goto skip_slb_search;
> } else {
> + target_ulong limit = rmls_limit(cpu);
> +
> /* Emulated old-style RMO mode, bounds check against RMLS */
> - if (raddr >= env->rmls) {
> + if (raddr >= limit) {
> if (rwx == 2) {
> ppc_hash64_set_isi(cs, SRR1_PROTFAULT);
> } else {
> @@ -1005,8 +1007,9 @@ hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
> return -1;
> }
> } else {
> + target_ulong limit = rmls_limit(cpu);
> /* Emulated old-style RMO mode, bounds check against RMLS */
> - if (raddr >= env->rmls) {
> + if (raddr >= limit) {
> return -1;
> }
> return raddr | env->spr[SPR_RMOR];
> @@ -1096,7 +1099,6 @@ void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
> CPUPPCState *env = &cpu->env;
>
> env->spr[SPR_LPCR] = val & pcc->lpcr_mask;
> - env->rmls = rmls_limit(cpu);
> ppc_hash64_update_vrma(cpu);
> }
>
>
prev parent reply other threads:[~2020-01-08 8:32 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
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 [this message]
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