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Date: Thu, 12 Jul 2018 16:36:15 +0200 From: Tony Krowiak <akrowiak@...ux.ibm.com> To: Halil Pasic <pasic@...ux.ibm.com>, Tony Krowiak <akrowiak@...ux.vnet.ibm.com>, linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Cc: freude@...ibm.com, schwidefsky@...ibm.com, heiko.carstens@...ibm.com, borntraeger@...ibm.com, cohuck@...hat.com, kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com, alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com, alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com, jjherne@...ux.vnet.ibm.com, thuth@...hat.com, pasic@...ux.vnet.ibm.com, berrange@...hat.com, fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com Subject: Re: [PATCH v6 15/21] s390: vfio-ap: configure the guest's AP matrix On 07/12/2018 01:22 AM, Halil Pasic wrote: > > > On 06/29/2018 11:11 PM, Tony Krowiak wrote: >> From: Tony Krowiak <akrowiak@...ux.ibm.com> >> >> Configures the AP adapters, usage domains and control domains for the >> KVM guest from the matrix configured via the mediated matrix device's >> sysfs attribute files. >> > [..] >> + >> +static void kvm_ap_set_crycb_masks(struct ap_matrix_mdev *matrix_mdev) >> +{ >> + int nbytes; >> + unsigned long *apm, *aqm, *adm; >> + >> + kvm_ap_clear_crycb_masks(matrix_mdev); >> + >> + apm = kvm_ap_get_crycb_apm(matrix_mdev); >> + aqm = kvm_ap_get_crycb_aqm(matrix_mdev); >> + adm = kvm_ap_get_crycb_adm(matrix_mdev); >> + >> + nbytes = KVM_AP_MASK_BYTES(matrix_mdev->matrix.apm_max + 1); >> + memcpy(apm, matrix_mdev->matrix.apm, nbytes); >> + >> + nbytes = KVM_AP_MASK_BYTES(matrix_mdev->matrix.aqm_max + 1); >> + memcpy(aqm, matrix_mdev->matrix.aqm, nbytes); >> + >> + /* >> + * Merge the AQM and ADM since the ADM is a superset of the >> + * AQM by agreed-upon convention. >> + */ >> + bitmap_or(adm, matrix_mdev->matrix.adm, matrix_mdev->matrix.aqm, >> + matrix_mdev->matrix.adm_max + 1); > > Are you sure this or works as expected? E.g. if adm_max == 15 the bitmaps > include the least significant 2 bytes but you want the other two. Since test system has only 15 domains defined this has never been a problem. I'll write a function rather than using the bitmap_or(). > > >> +}
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