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Tue, 21 Jan 2020 16:48:35 +0000 (UTC) Received: from [10.36.118.56] (unknown [10.36.118.56]) by smtp.corp.redhat.com (Postfix) with ESMTP id 22A0F5D9E2; Tue, 21 Jan 2020 16:48:33 +0000 (UTC) Subject: Re: [PATCH v4] target/s390x/kvm: Enable adapter interruption suppression again To: Thomas Huth , Cornelia Huck , qemu-devel@nongnu.org References: <20200121163338.21704-1-thuth@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= mQINBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABtCREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT6JAlgEEwEIAEICGwMFCQlmAYAGCwkIBwMCBhUI AgkKCwQWAgMBAh4BAheAFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl3pImkCGQEACgkQTd4Q 9wD/g1o+VA//SFvIHUAvul05u6wKv/pIR6aICPdpF9EIgEU448g+7FfDgQwcEny1pbEzAmiw zAXIQ9H0NZh96lcq+yDLtONnXk/bEYWHHUA014A1wqcYNRY8RvY1+eVHb0uu0KYQoXkzvu+s Dncuguk470XPnscL27hs8PgOP6QjG4jt75K2LfZ0eAqTOUCZTJxA8A7E9+XTYuU0hs7QVrWJ jQdFxQbRMrYz7uP8KmTK9/Cnvqehgl4EzyRaZppshruKMeyheBgvgJd5On1wWq4ZUV5PFM4x II3QbD3EJfWbaJMR55jI9dMFa+vK7MFz3rhWOkEx/QR959lfdRSTXdxs8V3zDvChcmRVGN8U Vo93d1YNtWnA9w6oCW1dnDZ4kgQZZSBIjp6iHcA08apzh7DPi08jL7M9UQByeYGr8KuR4i6e RZI6xhlZerUScVzn35ONwOC91VdYiQgjemiVLq1WDDZ3B7DIzUZ4RQTOaIWdtXBWb8zWakt/ ztGhsx0e39Gvt3391O1PgcA7ilhvqrBPemJrlb9xSPPRbaNAW39P8ws/UJnzSJqnHMVxbRZC Am4add/SM+OCP0w3xYss1jy9T+XdZa0lhUvJfLy7tNcjVG/sxkBXOaSC24MFPuwnoC9WvCVQ ZBxouph3kqc4Dt5X1EeXVLeba+466P1fe1rC8MbcwDkoUo65Ag0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAGJAiUEGAECAA8FAlXLn5ECGwwFCQlmAYAACgkQTd4Q 9wD/g1qA6w/+M+ggFv+JdVsz5+ZIc6MSyGUozASX+bmIuPeIecc9UsFRatc91LuJCKMkD9Uv GOcWSeFpLrSGRQ1Z7EMzFVU//qVs6uzhsNk0RYMyS0B6oloW3FpyQ+zOVylFWQCzoyyf227y GW8HnXunJSC+4PtlL2AY4yZjAVAPLK2l6mhgClVXTQ/S7cBoTQKP+jvVJOoYkpnFxWE9pn4t H5QIFk7Ip8TKr5k3fXVWk4lnUi9MTF/5L/mWqdyIO1s7cjharQCstfWCzWrVeVctpVoDfJWp 4LwTuQ5yEM2KcPeElLg5fR7WB2zH97oI6/Ko2DlovmfQqXh9xWozQt0iGy5tWzh6I0JrlcxJ ileZWLccC4XKD1037Hy2FLAjzfoWgwBLA6ULu0exOOdIa58H4PsXtkFPrUF980EEibUp0zFz GotRVekFAceUaRvAj7dh76cToeZkfsjAvBVb4COXuhgX6N4pofgNkW2AtgYu1nUsPAo+NftU CxrhjHtLn4QEBpkbErnXQyMjHpIatlYGutVMS91XTQXYydCh5crMPs7hYVsvnmGHIaB9ZMfB njnuI31KBiLUks+paRkHQlFcgS2N3gkRBzH7xSZ+t7Re3jvXdXEzKBbQ+dC3lpJB0wPnyMcX FOTT3aZT7IgePkt5iC/BKBk3hqKteTnJFeVIT7EC+a6YUFg= Organization: Red Hat GmbH Message-ID: <9a63bec5-6b01-c1aa-65cd-44005acae8ef@redhat.com> Date: Tue, 21 Jan 2020 17:48:33 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: <20200121163338.21704-1-thuth@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-MC-Unique: Bt_yC1jHMMeRptSPYWANdg-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 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: Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, Matthew Rosato Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 21.01.20 17:33, Thomas Huth wrote: > The AIS feature has been disabled late in the v2.10 development cycle since > there were some issues with migration (see commit 3f2d07b3b01ea61126b - > "s390x/ais: for 2.10 stable: disable ais facility"). We originally wanted > to enable it again for newer machine types, but apparently we forgot to do > this so far. Let's do it for the new s390-ccw-virtio-5.0 machine now. > > While at it, also add a more verbose comment why we need the *_allowed() > wrappers in s390-virtio-ccw.c. > > Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1756946 > Reviewed-by: David Hildenbrand > Tested-by: Matthew Rosato > Signed-off-by: Thomas Huth > --- > v4: Use kvm_kernel_irqchip_allowed() for avoiding problems when running > with -machine s390-ccw-virtio,kernel_irqchip=off > > hw/s390x/s390-virtio-ccw.c | 20 +++++++++++++++++--- > include/hw/s390x/s390-virtio-ccw.h | 3 +++ > target/s390x/kvm.c | 9 ++++++--- > 3 files changed, 26 insertions(+), 6 deletions(-) > > diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c > index e0e28139a2..76254e8447 100644 > --- a/hw/s390x/s390-virtio-ccw.c > +++ b/hw/s390x/s390-virtio-ccw.c > @@ -452,6 +452,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data) > s390mc->cpu_model_allowed = true; > s390mc->css_migration_enabled = true; > s390mc->hpage_1m_allowed = true; > + s390mc->kvm_ais_allowed = true; > mc->init = ccw_init; > mc->reset = s390_machine_reset; > mc->hot_add_cpu = s390_hot_add_cpu; > @@ -505,6 +506,14 @@ static inline void machine_set_dea_key_wrap(Object *obj, bool value, > > static S390CcwMachineClass *current_mc; > > +/* > + * Get the class of the s390-ccw-virtio machine that is currently in use. > + * Note: libvirt is using the "none" machine to probe for the features of the > + * host CPU, so in case this is called with the "none" machine, the function > + * returns the TYPE_S390_CCW_MACHINE base class. In this base class, all the > + * various "*_allowed" variables are enabled, so that the *_allowed() wrappers > + * below return the correct default value for the "none" machine. > + */ > static S390CcwMachineClass *get_machine_class(void) > { > if (unlikely(!current_mc)) { > @@ -521,22 +530,24 @@ static S390CcwMachineClass *get_machine_class(void) > > bool ri_allowed(void) > { > - /* for "none" machine this results in true */ > return get_machine_class()->ri_allowed; > } > > bool cpu_model_allowed(void) > { > - /* for "none" machine this results in true */ > return get_machine_class()->cpu_model_allowed; > } > > bool hpage_1m_allowed(void) > { > - /* for "none" machine this results in true */ > return get_machine_class()->hpage_1m_allowed; > } > > +bool kvm_ais_allowed(void) > +{ > + return get_machine_class()->kvm_ais_allowed; > +} > + > static char *machine_get_loadparm(Object *obj, Error **errp) > { > S390CcwMachineState *ms = S390_CCW_MACHINE(obj); > @@ -658,8 +669,11 @@ static void ccw_machine_4_2_instance_options(MachineState *machine) > > static void ccw_machine_4_2_class_options(MachineClass *mc) > { > + S390CcwMachineClass *s390mc = S390_MACHINE_CLASS(mc); > + > ccw_machine_5_0_class_options(mc); > compat_props_add(mc->compat_props, hw_compat_4_2, hw_compat_4_2_len); > + s390mc->kvm_ais_allowed = false; > } > DEFINE_CCW_MACHINE(4_2, "4.2", false); > > diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h > index 8aa27199c9..e3ba3b88b1 100644 > --- a/include/hw/s390x/s390-virtio-ccw.h > +++ b/include/hw/s390x/s390-virtio-ccw.h > @@ -40,6 +40,7 @@ typedef struct S390CcwMachineClass { > bool cpu_model_allowed; > bool css_migration_enabled; > bool hpage_1m_allowed; > + bool kvm_ais_allowed; > } S390CcwMachineClass; > > /* runtime-instrumentation allowed by the machine */ > @@ -48,6 +49,8 @@ bool ri_allowed(void); > bool cpu_model_allowed(void); > /* 1M huge page mappings allowed by the machine */ > bool hpage_1m_allowed(void); > +/* adapter-interrupt suppression allowed by the machine? */ > +bool kvm_ais_allowed(void); > > /** > * Returns true if (vmstate based) migration of the channel subsystem > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index 15260aeb9a..1602a2c33d 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -365,10 +365,13 @@ int kvm_arch_init(MachineState *ms, KVMState *s) > /* > * The migration interface for ais was introduced with kernel 4.13 > * but the capability itself had been active since 4.12. As migration > - * support is considered necessary let's disable ais in the 2.10 > - * machine. > + * support is considered necessary, we only try to enable this for > + * newer machine types if KVM_CAP_S390_AIS_MIGRATION is available. > */ > - /* kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0); */ > + if (kvm_ais_allowed() && kvm_kernel_irqchip_allowed() && > + kvm_check_extension(s, KVM_CAP_S390_AIS_MIGRATION)) { > + kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0); > + } I just remembered that the availability of CPU features should in general not depend on the selected machine. We only have compat handling for pre-cpu-model-support machines (e.g., vx). The issue is, that the probed host cpu model is otherwise not guaranteed to run om a selected machine and you get misleading errors. Can someone remind me why we need kvm_ais_allowed() at all and cannot simply rely on cpu model checks to properly handle this (like all other features)? -- Thanks, David / dhildenb