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Tue, 3 Dec 2024 10:06:00 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.37]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 061F71956089; Tue, 3 Dec 2024 10:05:57 +0000 (UTC) Date: Tue, 3 Dec 2024 10:05:53 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Cc: qemu-devel@nongnu.org, Paolo Bonzini , Thomas Huth Subject: Re: [PATCH v3] system: Select HVF by default when no other accelerator is available Message-ID: References: <20241203094232.62232-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20241203094232.62232-1-philmd@linaro.org> User-Agent: Mutt/2.2.13 (2024-03-09) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.996, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue, Dec 03, 2024 at 10:42:32AM +0100, Philippe Mathieu-Daudé wrote: > When testing with a HVF-only binary, we get: > > 3/12 qemu:func-quick+func-aarch64 / func-aarch64-version ERROR 0.29s exit status 1 > stderr: > Traceback (most recent call last): > File "tests/functional/test_version.py", line 22, in test_qmp_human_info_version > self.vm.launch() > File "machine/machine.py", line 461, in launch > raise VMLaunchFailure( > qemu.machine.machine.VMLaunchFailure: ConnectError: Failed to establish session: EOFError > Exit code: 1 > Command: build/qemu-system-aarch64 -display none -vga none -chardev socket,id=mon,fd=5 -mon chardev=mon,mode=control -machine none -nodefaults > Output: qemu-system-aarch64: No accelerator selected and no default accelerator available > > Fix by checking for HVF in configure_accelerators() and using > it by default when no other accelerator is available. > > Signed-off-by: Philippe Mathieu-Daudé > --- > v2 was https://lore.kernel.org/qemu-devel/20241203091036.59898-1-philmd@linaro.org/ > --- > system/vl.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/system/vl.c b/system/vl.c > index 54998fdbc7e..2f855d83fbb 100644 > --- a/system/vl.c > +++ b/system/vl.c > @@ -2362,6 +2362,7 @@ static void configure_accelerators(const char *progname) > /* Select the default accelerator */ > bool have_tcg = accel_find("tcg"); > bool have_kvm = accel_find("kvm"); > + bool have_hvf = accel_find("hvf"); > > if (have_tcg && have_kvm) { > if (g_str_has_suffix(progname, "kvm")) { > @@ -2374,6 +2375,8 @@ static void configure_accelerators(const char *progname) > accelerators = "kvm"; > } else if (have_tcg) { > accelerators = "tcg"; > + } else if (have_hvf) { > + accelerators = "hvf"; > } else { > error_report("No accelerator selected and" > " no default accelerator available"); Reviewed-by: Daniel P. Berrangé This is a no-brainer first step IMHO, given it passes all functional tests. I think we should subsequently consider whether to even rank HVF above TCG, on the basis that HW acceleration is faster and should provide a host<->guest security boundary that we don't claim for TCG With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|