From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Peter Maydell <peter.maydell@linaro.org>,
Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
Qemu-block <qemu-block@nongnu.org>,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
Alberto Garcia <berto@igalia.com>,
Eduardo Habkost <ehabkost@redhat.com>,
kvm-devel <kvm@vger.kernel.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Michael Roth <mdroth@linux.vnet.ibm.com>,
Markus Armbruster <armbru@redhat.com>,
"Denis V. Lunev" <den@openvz.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH 3/3] i386/kvm: initialize struct at full before ioctl call
Date: Tue, 30 Jul 2019 19:09:56 +0200 [thread overview]
Message-ID: <515f23a7-c520-5474-e03b-4344a06bea2f@de.ibm.com> (raw)
In-Reply-To: <CAFEAcA_M7kTA-tmdNdP4-pVjKkdzHFXuSeR3wKYSohK+W38m+Q@mail.gmail.com>
On 30.07.19 18:46, Peter Maydell wrote:
> On Tue, 30 Jul 2019 at 17:05, Andrey Shinkevich
> <andrey.shinkevich@virtuozzo.com> wrote:
>>
>> Not the whole structure is initialized before passing it to the KVM.
>> Reduce the number of Valgrind reports.
>>
>> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
>
> Does it even make sense to try to valgrind a KVM-enabled run
> of QEMU? As soon as we run the guest it will make modifications
> to memory which Valgrind can't track; and I don't think
> Valgrind supports the KVM_RUN ioctl anyway...
As long as we do not care about the guest memory, it does make sense
and it does find bugs.
See also
https://www.linux-kvm.org/page/KVM_Forum_2014
https://www.linux-kvm.org/images/d/d2/03x07-Valgrind.pdf
Unfortunately I wasnt able to follow up on those.
next prev parent reply other threads:[~2019-07-30 17:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 16:01 [PATCH 0/3] Reduce the number of Valgrind reports in unit tests Andrey Shinkevich
2019-07-30 16:01 ` [PATCH 1/3] test-throttle: Fix uninitialized use of burst_length Andrey Shinkevich
2019-08-13 12:19 ` Alberto Garcia
2019-07-30 16:01 ` [PATCH 2/3] tests: Fix uninitialized byte in test_visitor_in_fuzz Andrey Shinkevich
2019-07-30 16:01 ` [PATCH 3/3] i386/kvm: initialize struct at full before ioctl call Andrey Shinkevich
2019-07-30 16:44 ` [Qemu-devel] " Philippe Mathieu-Daudé
2019-07-30 17:05 ` Christian Borntraeger
2019-07-30 17:14 ` Philippe Mathieu-Daudé
2019-07-30 17:47 ` Christian Borntraeger
2019-07-31 9:05 ` Christophe de Dinechin
2019-07-31 12:32 ` Paolo Bonzini
2019-07-31 14:10 ` Andrey Shinkevich
2019-07-30 19:22 ` Paolo Bonzini
2019-07-30 16:46 ` Peter Maydell
2019-07-30 17:09 ` Christian Borntraeger [this message]
2019-07-30 19:20 ` Paolo Bonzini
2019-07-31 7:24 ` Christian Borntraeger
2019-07-31 12:04 ` Andrey Shinkevich
2019-07-31 12:28 ` Christian Borntraeger
2019-07-31 12:43 ` Christian Borntraeger
2019-07-31 13:03 ` Paolo Bonzini
2019-07-31 14:11 ` Andrey Shinkevich
2019-08-13 12:02 ` [PATCH 0/3] Reduce the number of Valgrind reports in unit tests Andrey Shinkevich
2019-08-13 12:05 ` Paolo Bonzini
2019-08-13 12:08 ` Andrey Shinkevich
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