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Wed, 07 Aug 2024 05:09:15 -0700 (PDT) Received: from ziepe.ca ([128.77.69.90]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-451c87314b3sm4325031cf.42.2024.08.07.05.09.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Aug 2024 05:09:14 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1sbfTd-001jVl-L5; Wed, 07 Aug 2024 09:09:13 -0300 Date: Wed, 7 Aug 2024 09:09:13 -0300 From: Jason Gunthorpe To: Baolu Lu Cc: Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/7] iommu/vt-d: Always reserve a domain ID for identity setup Message-ID: <20240807120913.GC8473@ziepe.ca> References: <20240806023941.93454-1-baolu.lu@linux.intel.com> <20240806023941.93454-4-baolu.lu@linux.intel.com> <20240806170653.GL676757@ziepe.ca> <59eb2544-1c85-4fde-87be-4d97e1f0a246@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <59eb2544-1c85-4fde-87be-4d97e1f0a246@linux.intel.com> On Wed, Aug 07, 2024 at 02:19:57PM +0800, Baolu Lu wrote: > On 2024/8/7 1:06, Jason Gunthorpe wrote: > > On Tue, Aug 06, 2024 at 10:39:37AM +0800, Lu Baolu wrote: > > > We will use a global static identity domain. Reserve a static domain ID > > > for it. > > > > > > Signed-off-by: Lu Baolu > > > --- > > > drivers/iommu/intel/iommu.c | 6 +++--- > > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > > > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > > > index 723ea9f3f501..c019fb3b3e78 100644 > > > --- a/drivers/iommu/intel/iommu.c > > > +++ b/drivers/iommu/intel/iommu.c > > > @@ -1440,10 +1440,10 @@ static int iommu_init_domains(struct intel_iommu *iommu) > > > * entry for first-level or pass-through translation modes should > > > * be programmed with a domain id different from those used for > > > * second-level or nested translation. We reserve a domain id for > > > - * this purpose. > > > + * this purpose. This domain id is also used for identity domain > > > + * in legacy mode. > > > */ > > > - if (sm_supported(iommu)) > > > - set_bit(FLPT_DEFAULT_DID, iommu->domain_ids); > > > + set_bit(FLPT_DEFAULT_DID, iommu->domain_ids); > > That should probablyturn into an IDA someday, it would likely be more > > memory efficient than bitmap_zalloc() > > I have tried to. But I failed to find a suitable ida interface to > calculate the count of allocated domain IDs to replace bitmap_weight() > in below code. For something debugging like that just use idr_for_each_entry() count++; It is a weird thing to put in sysfs in the first place... Jason