From: Paolo Bonzini <pbonzini@redhat.com>
To: "Claudio Fontana" <cfontana@suse.de>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
"Pavel Dovgalyuk" <dovgaluk@ispras.ru>
Cc: Laurent Vivier <lvivier@redhat.com>,
Thomas Huth <thuth@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
qemu-devel@nongnu.org, Roman Bolshakov <r.bolshakov@yadro.com>,
haxm-team@intel.com, Wenchao Wang <wenchao.wang@intel.com>,
Sunil Muthuswamy <sunilmut@microsoft.com>,
Richard Henderson <rth@twiddle.net>,
Colin Xu <colin.xu@intel.com>
Subject: Re: [RFC v3 1/8] cpu-timers, icount: new modules
Date: Tue, 4 Aug 2020 10:23:41 +0200 [thread overview]
Message-ID: <5b34dad3-9868-c773-4ce0-0063837e17a2@redhat.com> (raw)
In-Reply-To: <910286a7-805d-3b62-a3b0-aeb5d0a9606e@suse.de>
On 04/08/20 10:13, Claudio Fontana wrote:
>> - if (mem && use_icount && dbs->dir == DMA_DIRECTION_FROM_DEVICE) {
>> + if (mem && icount_enabled() && dbs->dir == DMA_DIRECTION_FROM_DEVICE) {
>
>
>
> In this specific case, where dma_blk_cb() changes its behaviour to be more deterministic
> if icount_enabled(),
>
> do you think that if qtest_enabled() we should also follow the more deterministic path,
> or should we go through the "normal" path instead, as this patch does?
>
> Tests pass in any case, but I wonder what would be the best behavior for qtest accel in this case.
> (Maybe Pavel?)
No, qtests simply should not use SG lists that cause the problematic
nondeterminism. We don't have that luxury for guests.
Paolo
next prev parent reply other threads:[~2020-08-04 8:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-03 9:05 [RFC v3 0/8] QEMU cpus.c refactoring part2 Claudio Fontana
2020-08-03 9:05 ` [RFC v3 1/8] cpu-timers, icount: new modules Claudio Fontana
2020-08-04 8:13 ` Claudio Fontana
2020-08-04 8:23 ` Paolo Bonzini [this message]
2020-08-03 9:05 ` [RFC v3 2/8] cpus: prepare new CpusAccel cpu accelerator interface Claudio Fontana
2020-08-05 8:40 ` Claudio Fontana
2020-08-05 8:47 ` Paolo Bonzini
2020-08-05 8:50 ` Claudio Fontana
2020-08-11 8:59 ` Roman Bolshakov
2020-08-11 10:57 ` Claudio Fontana
2020-08-20 8:17 ` Claudio Fontana
2020-08-30 13:34 ` Claudio Fontana
2020-08-30 16:41 ` Paolo Bonzini
2020-08-03 9:05 ` [RFC v3 3/8] cpus: extract out TCG-specific code to accel/tcg Claudio Fontana
2020-08-03 9:05 ` [RFC v3 4/8] cpus: extract out qtest-specific code to accel/qtest Claudio Fontana
2020-08-03 9:05 ` [RFC v3 5/8] cpus: extract out kvm-specific code to accel/kvm Claudio Fontana
2020-08-03 9:05 ` [RFC v3 6/8] cpus: extract out hax-specific code to target/i386/ Claudio Fontana
2020-08-03 9:05 ` [RFC v3 7/8] cpus: extract out whpx-specific " Claudio Fontana
2020-08-03 9:05 ` [RFC v3 8/8] cpus: extract out hvf-specific code to target/i386/hvf/ Claudio Fontana
2020-08-11 9:00 ` Roman Bolshakov
2020-08-11 13:42 ` Claudio Fontana
2020-08-11 14:28 ` Claudio Fontana
2020-08-03 9:40 ` [RFC v3 0/8] QEMU cpus.c refactoring part2 Paolo Bonzini
2020-08-03 11:48 ` Alex Bennée
2020-08-05 17:03 ` Claudio Fontana
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