From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>,
Alvise Rigo <a.rigo@virtualopensystems.com>
Cc: mttcg@listserver.greensocs.com,
"Claudio Fontana" <claudio.fontana@huawei.com>,
"Mark Burton" <mark.burton@greensocs.com>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Jani Kokkonen" <jani.kokkonen@huawei.com>,
"tech@virtualopensystems.com" <tech@virtualopensystems.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"KONRAD Frédéric" <fred.konrad@greensocs.com>
Subject: Re: [Qemu-devel] [mttcg] cputlb: Use async tlb_flush_by_mmuidx
Date: Mon, 29 Feb 2016 14:50:04 +0100 [thread overview]
Message-ID: <56D44C8C.3050800@redhat.com> (raw)
In-Reply-To: <CAFEAcA-q83jYc3atGjxRWuvEYXf3r6d8Q_wbYK4KCcuDj8Qi5g@mail.gmail.com>
On 29/02/2016 14:21, Peter Maydell wrote:
> On 29 February 2016 at 13:16, Alvise Rigo <a.rigo@virtualopensystems.com> wrote:
>> > As in the case of tlb_flush(), also tlb_flush_by_mmuidx has to query the
>> > TLB flush if it targets another VCPU. To accomplish this, a new async
>> > work has been added, together with a new TLBFlushByMMUIdxParams. A
>> > bitmap is used to track the MMU indexes to flush.
>> >
>> > This patch applies to the multi_tcg_v8 branch.
> What's the API for a target CPU emulation to say "and now I must
> wait for the TLB op to finish" before completing this guest
> instruction?
My proposal has been for a while for DMB to put the CPU in a halted
state (remote TLB callbacks then can decrement a counter and signal
cpu_halt_cond when it's zero), but no one has implemented this.
Paolo
next prev parent reply other threads:[~2016-02-29 13:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 13:16 [Qemu-devel] [mttcg] cputlb: Use async tlb_flush_by_mmuidx Alvise Rigo
2016-02-29 13:21 ` Peter Maydell
2016-02-29 13:50 ` Paolo Bonzini [this message]
2016-02-29 13:55 ` Peter Maydell
2016-02-29 14:02 ` alvise rigo
2016-02-29 14:06 ` Paolo Bonzini
2016-02-29 14:18 ` alvise rigo
2016-03-04 14:28 ` alvise rigo
2016-03-07 20:18 ` Alex Bennée
2016-03-07 21:18 ` Paolo Bonzini
2016-03-11 11:08 ` alvise rigo
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