From: Paolo Bonzini <pbonzini@redhat.com>
To: Maxime Villard <max@m00nbsd.net>
Cc: peter.maydell@linaro.org, ehabkost@redhat.com, slp@redhat.com,
qemu-devel@nongnu.org, jmcneill@invisible.ca,
Kamil Rytarowski <n54@gmx.com>,
philmd@redhat.com, rth <rth@twiddle.net>
Subject: Re: [PATCH v4 3/4] Introduce the NVMM impl
Date: Wed, 11 Mar 2020 21:42:22 +0100 [thread overview]
Message-ID: <050cacce-41fc-db89-ded9-5cdf6c20a2de@redhat.com> (raw)
In-Reply-To: <f48f9c36-5104-1346-cb91-d52c2887097b@m00nbsd.net>
On 11/03/20 21:14, Maxime Villard wrote:
>> The problem is that qcpu->stop is checked _before_ entering the
>> hypervisor and not after, so there is a small race window.
> Ok. I don't understand what's supposed to be the race here. If we get an
> IPI between the check and the call to nvmm_vcpu_run() then we'll just do
> one run and stop in the next iteration, because the IPI will have set
> qcpu->stop. Is this extra iteration undesired?
Yes, you don't know how long that run would take. I don't know about
NVMM but for KVM it may even never leave if the guest is in HLT state.
Paolo
next prev parent reply other threads:[~2020-03-11 20:43 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200107124903.16505-1-n54@gmx.com>
2020-01-28 14:09 ` [PATCH v2 0/4] Implements the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-01-28 14:09 ` [PATCH v2 1/4] Add the NVMM vcpu API Kamil Rytarowski
2020-02-03 11:42 ` Philippe Mathieu-Daudé
2020-01-28 14:09 ` [PATCH v2 2/4] Add the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-02-03 11:41 ` Philippe Mathieu-Daudé
2020-02-03 11:56 ` Kamil Rytarowski
2020-02-03 12:10 ` Philippe Mathieu-Daudé
2020-03-02 17:12 ` Paolo Bonzini
2020-03-02 18:05 ` Kamil Rytarowski
2020-03-02 19:14 ` Maxime Villard
2020-03-02 19:40 ` Paolo Bonzini
2020-03-02 21:10 ` Kamil Rytarowski
2020-03-02 22:45 ` Paolo Bonzini
2020-03-02 17:11 ` Paolo Bonzini
2020-03-02 18:09 ` Kamil Rytarowski
2020-01-28 14:09 ` [PATCH v2 3/4] Introduce the NVMM impl Kamil Rytarowski
2020-02-03 11:51 ` Philippe Mathieu-Daudé
2020-02-05 17:22 ` Kamil Rytarowski
2020-02-05 17:47 ` Maxime Villard
2020-01-28 14:09 ` [PATCH v2 4/4] Add the NVMM acceleration enlightenments Kamil Rytarowski
2020-02-03 11:54 ` Philippe Mathieu-Daudé
2020-02-06 10:24 ` Kamil Rytarowski
2020-02-06 12:18 ` Philippe Mathieu-Daudé
2020-02-06 13:06 ` Markus Armbruster
2020-02-06 13:09 ` Philippe Mathieu-Daudé
2020-02-06 13:31 ` Kamil Rytarowski
2020-02-06 14:13 ` Markus Armbruster
2020-02-06 15:38 ` Kamil Rytarowski
2020-02-06 16:07 ` Philippe Mathieu-Daudé
2020-02-06 16:59 ` Kamil Rytarowski
2020-02-03 9:52 ` [PATCH v2 0/4] Implements the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-02-06 11:57 ` [PATCH v3 " Kamil Rytarowski
2020-02-06 11:57 ` [PATCH v3 1/4] Add the NVMM vcpu API Kamil Rytarowski
2020-02-06 21:06 ` Jared McNeill
2020-02-06 11:57 ` [PATCH v3 2/4] Add the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-02-06 21:06 ` Jared McNeill
2020-02-06 11:57 ` [PATCH v3 3/4] Introduce the NVMM impl Kamil Rytarowski
2020-02-06 21:07 ` Jared McNeill
2020-02-06 11:57 ` [PATCH v3 4/4] Add the NVMM acceleration enlightenments Kamil Rytarowski
2020-02-06 21:07 ` Jared McNeill
2020-02-06 13:13 ` [PATCH v3 0/4] Implements the NetBSD Virtual Machine Monitor accelerator no-reply
2020-02-06 13:21 ` Kamil Rytarowski
2020-02-06 16:01 ` Philippe Mathieu-Daudé
2020-02-06 21:32 ` [PATCH v4 " Kamil Rytarowski
2020-02-06 21:32 ` [PATCH v4 1/4] Add the NVMM vcpu API Kamil Rytarowski
2020-08-11 12:47 ` [PATCH v5 " Kamil Rytarowski
2020-08-11 12:47 ` [PATCH v5 2/4] Add the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-08-11 12:47 ` [PATCH v5 3/4] Introduce the NVMM impl Kamil Rytarowski
2020-08-11 12:47 ` [PATCH v5 4/4] Add the NVMM acceleration enlightenments Kamil Rytarowski
2020-08-11 13:01 ` [PATCH v5 1/4] Add the NVMM vcpu API Kamil Rytarowski
2020-08-11 13:01 ` [PATCH v5 2/4] Add the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-08-11 13:01 ` [PATCH v5 3/4] Introduce the NVMM impl Kamil Rytarowski
2020-08-11 13:01 ` [PATCH v5 4/4] Add the NVMM acceleration enlightenments Kamil Rytarowski
2020-09-04 23:28 ` [PATCH v5 1/4] Add the NVMM vcpu API Kamil Rytarowski
2020-02-06 21:32 ` [PATCH v4 2/4] Add the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-02-06 21:32 ` [PATCH v4 3/4] Introduce the NVMM impl Kamil Rytarowski
2020-02-06 23:28 ` [PATCH v4 3/4 FIXUP] " Kamil Rytarowski
2020-03-02 18:13 ` [PATCH v4 3/4] " Paolo Bonzini
2020-03-02 19:28 ` Maxime Villard
2020-03-02 19:35 ` Paolo Bonzini
2020-03-10 6:45 ` Maxime Villard
2020-03-10 10:15 ` Kamil Rytarowski
2020-03-10 10:58 ` Paolo Bonzini
2020-03-10 19:14 ` Maxime Villard
2020-03-11 18:03 ` Paolo Bonzini
2020-03-11 20:14 ` Maxime Villard
2020-03-11 20:42 ` Paolo Bonzini [this message]
2020-03-11 21:21 ` Maxime Villard
2020-03-11 21:22 ` Kamil Rytarowski
2020-03-11 21:44 ` Paolo Bonzini
2020-03-12 7:08 ` Maxime Villard
2020-07-21 13:42 ` Kamil Rytarowski
2020-02-06 21:32 ` [PATCH v4 4/4] Add the NVMM acceleration enlightenments Kamil Rytarowski
2020-02-17 9:07 ` [PATCH v4 0/4] Implements the NetBSD Virtual Machine Monitor accelerator Kamil Rytarowski
2020-02-24 15:17 ` Kamil Rytarowski
2020-03-02 17:02 ` Kamil Rytarowski
2020-03-02 17:10 ` Eduardo Habkost
2020-03-02 17:10 ` Kamil Rytarowski
2020-03-02 17:22 ` Eduardo Habkost
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