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[2a02:8428:527:dd01:97e1:f7ae:2e2c:ffab]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-450d7fb0654sm173171075e9.21.2025.06.03.13.30.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Jun 2025 13:30:16 -0700 (PDT) Message-ID: <5248c4f1-923e-4f6b-9c3f-ac24666fea04@redhat.com> Date: Tue, 3 Jun 2025 22:30:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v11 3/4] hw/vfio/ap: Storing event information for an AP configuration change event To: Rorie Reyes , qemu-devel@nongnu.org, qemu-s390x@nongnu.org Cc: pbonzini@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com, jjherne@linux.ibm.com, borntraeger@linux.ibm.com, alex.williamson@redhat.com, thuth@redhat.com, akrowiak@linux.ibm.com References: <20250523160338.41896-1-rreyes@linux.ibm.com> <20250523160338.41896-4-rreyes@linux.ibm.com> <66ad7451-b7a6-4112-8f20-1af06d5b482a@redhat.com> <834be7a8-922a-4e39-8453-6c9a1957d3ac@linux.ibm.com> <1a896c28-783b-4a1e-9cf5-6b8abfe8d7e4@redhat.com> Content-Language: en-US, fr From: =?UTF-8?Q?C=C3=A9dric_Le_Goater?= Autocrypt: addr=clg@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.128, 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_H5=0.001, RCVD_IN_MSPIKE_WL=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=unavailable 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 6/3/25 20:01, Rorie Reyes wrote: > > On 6/3/25 10:21 AM, Cédric Le Goater wrote: >> On 6/3/25 14:58, Rorie Reyes wrote: >>> Hey Cedric, >>> >>> You mentioned the following in my v9 patches >>> >>> "In that case, let's keep it simple (no mutex) and add a assert(bql_locked()) >>> statement where we think the bql should be protecting access to shared >>> resources. " >>> >>> Does this still apply down bellow? >> >> Anthony replied : >> >> https://lore.kernel.org/qemu-devel/ed2a2aa3-68a7-480c-a6a4-a8219af12d7b@linux.ibm.com/ >> >> Thanks, >> >> C. >> > So we'll still use WITH_QEMU_LOCK_GUARD? If a lock is needed to protect the list, then ap_chsc_sei_nt0_have_event() should lock/unlock too. WITH_QEMU_LOCK_GUARD() is just a pratical way to do so. Thanks, C. >>> >>> On 5/26/25 4:40 AM, Cédric Le Goater wrote: >>>> On 5/23/25 18:03, Rorie Reyes wrote: >>>>> These functions can be invoked by the function that handles interception >>>>> of the CHSC SEI instruction for requests indicating the accessibility of >>>>> one or more adjunct processors has changed. >>>>> >>>>> Signed-off-by: Rorie Reyes >>>>> --- >>>>>   hw/vfio/ap.c                 | 53 ++++++++++++++++++++++++++++++++++++ >>>>>   include/hw/s390x/ap-bridge.h | 39 ++++++++++++++++++++++++++ >>>>>   2 files changed, 92 insertions(+) >>>>> >>>>> diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c >>>>> index fc435f5c5b..97a42a575a 100644 >>>>> --- a/hw/vfio/ap.c >>>>> +++ b/hw/vfio/ap.c >>>>> @@ -10,6 +10,7 @@ >>>>>    * directory. >>>>>    */ >>>>>   +#include >>>>>   #include "qemu/osdep.h" >>>>>   #include CONFIG_DEVICES /* CONFIG_IOMMUFD */ >>>>>   #include >>>>> @@ -48,6 +49,8 @@ typedef struct APConfigChgEvent { >>>>>   static QTAILQ_HEAD(, APConfigChgEvent) cfg_chg_events = >>>>>       QTAILQ_HEAD_INITIALIZER(cfg_chg_events); >>>>>   +static QemuMutex cfg_chg_events_lock; >>>>> + >>>>>   OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE) >>>>>     static void vfio_ap_compute_needs_reset(VFIODevice *vdev) >>>>> @@ -96,6 +99,49 @@ static void vfio_ap_cfg_chg_notifier_handler(void *opaque) >>>>>     } >>>>>   +int ap_chsc_sei_nt0_get_event(void *res) >>>>> +{ >>>>> +    ChscSeiNt0Res *nt0_res  = (ChscSeiNt0Res *)res; >>>>> +    APConfigChgEvent *cfg_chg_event; >>>>> + >>>>> +    qemu_mutex_lock(&cfg_chg_events_lock); >>>> >>>> please consider using WITH_QEMU_LOCK_GUARD() >>>> >>> See note above about bql_locked >>>>> +    if (!ap_chsc_sei_nt0_have_event()) { >>>>> +        qemu_mutex_unlock(&cfg_chg_events_lock); >>>>> +        return EVENT_INFORMATION_NOT_STORED; >>>>> +    } >>>>> + >>>>> +    cfg_chg_event = QTAILQ_FIRST(&cfg_chg_events); >>>>> +    QTAILQ_REMOVE(&cfg_chg_events, cfg_chg_event, next); >>>>> + >>>>> +    qemu_mutex_unlock(&cfg_chg_events_lock); >>>>> + >>>>> +    memset(nt0_res, 0, sizeof(*nt0_res)); >>>>> +    g_free(cfg_chg_event); >>>>> + >>>>> +    /* >>>>> +     * If there are any AP configuration change events in the queue, >>>>> +     * indicate to the caller that there is pending event info in >>>>> +     * the response block >>>>> +     */ >>>>> +    if (ap_chsc_sei_nt0_have_event()) { >>>>> +        nt0_res->flags |= PENDING_EVENT_INFO_BITMASK; >>>>> +    } >>>>> + >>>>> +    nt0_res->length = sizeof(ChscSeiNt0Res); >>>>> +    nt0_res->code = NT0_RES_RESPONSE_CODE; >>>>> +    nt0_res->nt = NT0_RES_NT_DEFAULT; >>>>> +    nt0_res->rs = NT0_RES_RS_AP_CHANGE; >>>>> +    nt0_res->cc = NT0_RES_CC_AP_CHANGE; >>>>> + >>>>> +    return EVENT_INFORMATION_STORED; >>>>> +} >>>>> + >>>>> +bool ap_chsc_sei_nt0_have_event(void) >>>> >>>> hmm, no locking ? >>>> >>> See not above for bql_locked >>>>> +{ >>>>> +    return !QTAILQ_EMPTY(&cfg_chg_events); >>>>> +} >>>>> + >>>>>   static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev, >>>>>                                             unsigned int irq, Error **errp) >>>>>   { >>>>> @@ -192,6 +238,13 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp) >>>>>       VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); >>>>>       VFIODevice *vbasedev = &vapdev->vdev; >>>>>   +    static bool lock_initialized; >>>>> + >>>>> +    if (!lock_initialized) { >>>>> +        qemu_mutex_init(&cfg_chg_events_lock); >>>>> +        lock_initialized = true; >>>>> +    } >>>> >>>> this could be replaced with a constructor routine. See hyperv. >>>> >>>> >>>> Thanks, >>>> >>>> C. >>>> >>> Noted >>>> >>>> >>>>>       if (!vfio_device_get_name(vbasedev, errp)) { >>>>>           return; >>>>>       } >>>>> diff --git a/include/hw/s390x/ap-bridge.h b/include/hw/s390x/ap-bridge.h >>>>> index 470e439a98..7efc52928d 100644 >>>>> --- a/include/hw/s390x/ap-bridge.h >>>>> +++ b/include/hw/s390x/ap-bridge.h >>>>> @@ -16,4 +16,43 @@ >>>>>     void s390_init_ap(void); >>>>>   +typedef struct ChscSeiNt0Res { >>>>> +    uint16_t length; >>>>> +    uint16_t code; >>>>> +    uint8_t reserved1; >>>>> +    uint16_t reserved2; >>>>> +    uint8_t nt; >>>>> +#define PENDING_EVENT_INFO_BITMASK 0x80; >>>>> +    uint8_t flags; >>>>> +    uint8_t reserved3; >>>>> +    uint8_t rs; >>>>> +    uint8_t cc; >>>>> +} QEMU_PACKED ChscSeiNt0Res; >>>>> + >>>>> +#define NT0_RES_RESPONSE_CODE 1 >>>>> +#define NT0_RES_NT_DEFAULT    0 >>>>> +#define NT0_RES_RS_AP_CHANGE  5 >>>>> +#define NT0_RES_CC_AP_CHANGE  3 >>>>> + >>>>> +#define EVENT_INFORMATION_NOT_STORED 1 >>>>> +#define EVENT_INFORMATION_STORED     0 >>>>> + >>>>> +/** >>>>> + * ap_chsc_sei_nt0_get_event - Retrieve the next pending AP config >>>>> + * change event >>>>> + * @res: Pointer to a ChscSeiNt0Res struct to be filled with event >>>>> + * data >>>>> + * >>>>> + * This function checks for any pending AP config change events and, >>>>> + * if present, populates the provided response structure with the >>>>> + * appropriate SEI NT0 fields. >>>>> + * >>>>> + * Return: >>>>> + *   EVENT_INFORMATION_STORED - An event was available and written to @res >>>>> + *   EVENT_INFORMATION_NOT_STORED - No event was available >>>>> + */ >>>>> +int ap_chsc_sei_nt0_get_event(void *res); >>>>> + >>>>> +bool ap_chsc_sei_nt0_have_event(void); >>>>> +>   #endif >>>> >>> >> >