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Wed, 8 Dec 2021 12:59:17 +0000 (GMT) Received: from [9.171.54.177] (unknown [9.171.54.177]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 8 Dec 2021 12:59:17 +0000 (GMT) Message-ID: <2a5ec1f1-a0f4-9c55-38df-c48dfe9234f7@linux.ibm.com> Date: Wed, 8 Dec 2021 13:59:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH 06/32] s390/airq: allow for airq structure that uses an input vector Content-Language: en-US To: Matthew Rosato , linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20211207205743.150299-1-mjrosato@linux.ibm.com> <20211207205743.150299-7-mjrosato@linux.ibm.com> From: Christian Borntraeger In-Reply-To: <20211207205743.150299-7-mjrosato@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: O0E25g8EFfYFOGfwJlLLldFUlYMRmlk- X-Proofpoint-GUID: YHMG5Sn74x3c_OLc-6WQ-9EgbMV5m5Xp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-08_04,2021-12-08_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 impostorscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112080080 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 07.12.21 um 21:57 schrieb Matthew Rosato: > When doing device passthrough where interrupts are being forwarded > from host to guest, we wish to use a pinned section of guest memory > as the vector (the same memory used by the guest as the vector). > > Signed-off-by: Matthew Rosato > --- > arch/s390/include/asm/airq.h | 4 +++- > arch/s390/pci/pci_irq.c | 8 ++++---- > drivers/s390/cio/airq.c | 10 +++++++--- > drivers/s390/virtio/virtio_ccw.c | 2 +- > 4 files changed, 15 insertions(+), 9 deletions(-) > > diff --git a/arch/s390/include/asm/airq.h b/arch/s390/include/asm/airq.h > index 7918a7d09028..e82e5626e139 100644 > --- a/arch/s390/include/asm/airq.h > +++ b/arch/s390/include/asm/airq.h > @@ -47,8 +47,10 @@ struct airq_iv { > #define AIRQ_IV_PTR 4 /* Allocate the ptr array */ > #define AIRQ_IV_DATA 8 /* Allocate the data array */ > #define AIRQ_IV_CACHELINE 16 /* Cacheline alignment for the vector */ > +#define AIRQ_IV_GUESTVEC 32 /* Vector is a pinned guest page */ > > -struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags); > +struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags, > + unsigned long *vec); > void airq_iv_release(struct airq_iv *iv); > unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num); > void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num); > diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c > index 880bcd73f11a..dfd4f3276a6d 100644 > --- a/arch/s390/pci/pci_irq.c > +++ b/arch/s390/pci/pci_irq.c > @@ -296,7 +296,7 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) > zdev->aisb = bit; > > /* Create adapter interrupt vector */ > - zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); > + zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK, 0); > if (!zdev->aibv) > return -ENOMEM; > > @@ -421,7 +421,7 @@ static int __init zpci_directed_irq_init(void) > union zpci_sic_iib iib = {{0}}; > unsigned int cpu; > > - zpci_sbv = airq_iv_create(num_possible_cpus(), 0); > + zpci_sbv = airq_iv_create(num_possible_cpus(), 0, 0); For a pointer use NULL? Also in other places. With the indentation fix this looks sane.