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From: Richard Henderson <rth@twiddle.net>
To: "Alex Bennée" <alex.bennee@linaro.org>,
	mttcg@greensocs.com, qemu-devel@nongnu.org,
	fred.konrad@greensocs.com, a.rigo@virtualopensystems.com,
	cota@braap.org, bobby.prani@gmail.com, nikunj@linux.vnet.ibm.com
Cc: mark.burton@greensocs.com, pbonzini@redhat.com,
	jan.kiszka@siemens.com, serge.fdrv@gmail.com,
	peter.maydell@linaro.org, claudio.fontana@huawei.com,
	bamvor.zhangjian@linaro.org,
	Peter Crosthwaite <crosthwaite.peter@gmail.com>
Subject: Re: [Qemu-devel] [PATCH v8 19/25] cputlb: introduce tlb_flush_*_all_cpus[_synced]
Date: Tue, 31 Jan 2017 15:35:10 -0800	[thread overview]
Message-ID: <960d0eec-03ec-1c8e-bb64-c80a60ca8149@twiddle.net> (raw)
In-Reply-To: <20170127103922.19658-20-alex.bennee@linaro.org>

On 01/27/2017 02:39 AM, Alex Bennée wrote:
> This introduces support to the cputlb API for flushing all CPUs TLBs
> with one call. This avoids the need for target helpers to iterate
> through the vCPUs themselves.
>
> An additional variant of the API (_synced) do not return from the
> caller and will cause the work to be scheduled as "safe work". The
> result will be all the flush operations will be complete by the time
> the originating vCPU starts executing again. It is up to the caller to
> ensure enough state has been saved so execution can be restarted at
> the next appropriate instruction.
>
> Some guest architectures can defer completion of flush operations
> until later. If they later schedule work using the async_safe_work
> mechanism they can be sure other vCPUs will have flushed their TLBs by
> the point execution returns from the safe work.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: Richard Henderson <rth@twiddle.net>


r~

  reply	other threads:[~2017-01-31 23:35 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-27 10:38 [Qemu-devel] [PATCH v8 00/25] Remaining MTTCG Base patches and ARM enablement Alex Bennée
2017-01-27 10:38 ` [Qemu-devel] [PATCH v8 01/25] docs: new design document multi-thread-tcg.txt Alex Bennée
2017-01-27 10:38 ` [Qemu-devel] [PATCH v8 02/25] mttcg: translate-all: Enable locking debug in a debug build Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 03/25] mttcg: Add missing tb_lock/unlock() in cpu_exec_step() Alex Bennée
2017-01-31 19:13   ` Richard Henderson
2017-02-01 10:57     ` Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 04/25] tcg: move TCG_MO/BAR types into own file Alex Bennée
2017-01-29 20:55   ` Pranith Kumar
2017-01-30  9:57     ` Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 05/25] tcg: add options for enabling MTTCG Alex Bennée
2017-01-29 20:37   ` Pranith Kumar
2017-01-31 14:50     ` Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 06/25] tcg: add kick timer for single-threaded vCPU emulation Alex Bennée
2017-01-29 21:00   ` Pranith Kumar
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 07/25] tcg: rename tcg_current_cpu to tcg_current_rr_cpu Alex Bennée
2017-01-29 21:04   ` Pranith Kumar
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 08/25] tcg: drop global lock during TCG code execution Alex Bennée
2017-01-29 21:33   ` Pranith Kumar
2017-01-30  9:57     ` Alex Bennée
2017-01-30 16:52       ` Richard Henderson
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 09/25] tcg: remove global exit_request Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 10/25] tcg: enable tb_lock() for SoftMMU Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 11/25] tcg: enable thread-per-vCPU Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 12/25] tcg: handle EXCP_ATOMIC exception for system emulation Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 13/25] cputlb: add assert_cpu_is_self checks Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 14/25] cputlb: tweak qemu_ram_addr_from_host_nofail reporting Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 15/25] cputlb: introduce tlb_flush_* async work Alex Bennée
2017-01-31 20:04   ` Richard Henderson
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 16/25] cputlb and arm/sparc targets: convert mmuidx flushes from varg to bitmap Alex Bennée
2017-01-31 23:09   ` Richard Henderson
2017-02-01  7:42     ` Alex Bennée
2017-02-01 11:03     ` Alex Bennée
2017-02-01 18:03       ` Richard Henderson
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 17/25] cputlb: add tlb_flush_by_mmuidx async routines Alex Bennée
2017-01-31 23:12   ` Richard Henderson
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 18/25] cputlb: atomically update tlb fields used by tlb_reset_dirty Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 19/25] cputlb: introduce tlb_flush_*_all_cpus[_synced] Alex Bennée
2017-01-31 23:35   ` Richard Henderson [this message]
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 20/25] target-arm/powerctl: defer cpu reset work to CPU context Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 21/25] target-arm: don't generate WFE/YIELD calls for MTTCG Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 22/25] target-arm/cpu.h: make ARM_CP defined consistent Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 23/25] target-arm: introduce ARM_CP_EXIT_PC Alex Bennée
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 24/25] target-arm: ensure all cross vCPUs TLB flushes complete Alex Bennée
2017-01-31 23:37   ` Richard Henderson
2017-01-27 10:39 ` [Qemu-devel] [PATCH v8 25/25] tcg: enable MTTCG by default for ARM on x86 hosts Alex Bennée
2017-01-31 23:39   ` Richard Henderson
2017-02-01  7:44     ` Alex Bennée
2017-01-29 23:05 ` [Qemu-devel] [PATCH v8 00/25] Remaining MTTCG Base patches and ARM enablement Pranith Kumar
2017-01-31 23:44 ` Richard Henderson
     [not found] <20170127103505.18606-1-alex.bennee@linaro.org>
2017-01-27 10:34 ` [Qemu-devel] [PATCH v8 19/25] cputlb: introduce tlb_flush_*_all_cpus[_synced] Alex Bennée

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