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Mon, 27 Jul 2020 12:43:52 +0000 (UTC) Date: Mon, 27 Jul 2020 14:43:50 +0200 From: Cornelia Huck To: Thiago Jung Bauermann Subject: Re: [RFC PATCH v3 8/8] target/s390x: Use start-powered-off CPUState property Message-ID: <20200727144350.47abd7e7.cohuck@redhat.com> In-Reply-To: <20200723025657.644724-9-bauerman@linux.ibm.com> References: <20200723025657.644724-1-bauerman@linux.ibm.com> <20200723025657.644724-9-bauerman@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=cohuck@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/27 00:16:29 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Aleksandar Rikalo , Eduardo Habkost , Aleksandar Markovic , Alex =?UTF-8?B?QmVubsOpZQ==?= , David Hildenbrand , Mark Cave-Ayland , qemu-devel@nongnu.org, Greg Kurz , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, Artyom Tarasenko , Thomas Huth , Paolo Bonzini , Richard Henderson , Philippe =?UTF-8?B?TWF0aGlldS1EYXVkw6k=?= , Aurelien Jarno , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 22 Jul 2020 23:56:57 -0300 Thiago Jung Bauermann wrote: > Instead of setting CPUState::halted to 1 in s390_cpu_initfn(), use the > start-powered-off property which makes cpu_common_reset() initialize it > to 1 in common code. > > Note that this changes behavior by setting cs->halted to 1 on reset, which > didn't happen before. I think that should be fine, as we change the cpu state to STOPPED in the reset function, which sets halted to 1. > > Signed-off-by: Thiago Jung Bauermann > --- > target/s390x/cpu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > NB: I was only able to test that this patch builds. I wasn't able to > run it. No noticeable difference under kvm, but running under tcg seems a bit more sluggish than usual, and I saw some pausing on reboot (after the bios handover to the kernel). Not sure if it were just flukes on my laptop, would appreciate if someone else could give it a go. > > diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c > index 08eb674d22..73d7d6007e 100644 > --- a/target/s390x/cpu.c > +++ b/target/s390x/cpu.c > @@ -291,7 +291,7 @@ static void s390_cpu_initfn(Object *obj) > S390CPU *cpu = S390_CPU(obj); > > cpu_set_cpustate_pointers(cpu); > - cs->halted = 1; > + cs->start_powered_off = true; > cs->exception_index = EXCP_HLT; > #if !defined(CONFIG_USER_ONLY) > object_property_add(obj, "crash-information", "GuestPanicInformation", >