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<9519c98b6f681aac58201ffef389e2da86111272.camel@linux.ibm.com> Subject: Re: [PATCH v2 1/6] iommu/s390: add initial fields to track table size From: Niklas Schnelle To: Matthew Rosato , joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com Cc: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, borntraeger@linux.ibm.com, clegoate@redhat.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Date: Wed, 05 Feb 2025 16:08:44 +0100 In-Reply-To: <20250124201826.348848-2-mjrosato@linux.ibm.com> References: <20250124201826.348848-1-mjrosato@linux.ibm.com> <20250124201826.348848-2-mjrosato@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; keydata=mQINBGHm3M8BEAC+MIQkfoPIAKdjjk84OSQ8erd2OICj98+GdhMQpIjHXn/RJdCZLa58k /ay5x0xIHkWzx1JJOm4Lki7WEzRbYDexQEJP0xUia0U+4Yg7PJL4Dg/W4Ho28dRBROoJjgJSLSHwc 3/1pjpNlSaX/qg3ZM8+/EiSGc7uEPklLYu3gRGxcWV/944HdUyLcnjrZwCn2+gg9ncVJjsimS0ro/ 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impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502050117 On Fri, 2025-01-24 at 15:18 -0500, Matthew Rosato wrote: > In preparation for allowing for additional table levels, add the > necessary information to the zdev and s390 domain to track table > type. For now, these values will always be set to signify a > region third table which is what s390-iommu always uses today. >=20 > Signed-off-by: Matthew Rosato > --- > arch/s390/include/asm/pci.h | 2 ++ > drivers/iommu/s390-iommu.c | 17 +++++++++++------ > 2 files changed, 13 insertions(+), 6 deletions(-) >=20 > diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h > index 474e1f8d1d3c..8f8ebaeec60a 100644 > --- a/arch/s390/include/asm/pci.h > +++ b/arch/s390/include/asm/pci.h > @@ -189,6 +189,8 @@ struct zpci_dev { > struct kvm_zdev *kzdev; > struct mutex kzdev_lock; > spinlock_t dom_lock; /* protect s390_domain change */ > + u64 max_table_size; > + u8 origin_type; I think ideally we would keep the origin_type in the struct s390_domain only. For max_table_size I think we could just have an inline helper returning the max table size given its origin_type, especially in struct zpci_dev it feels wasteful to use 8 bytes in an already large struct for something we can recalculate and that doesn't even change often.