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Wed, 12 Aug 2026 05:30:34 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wu86L-000000030Ox-0KWD; Wed, 12 Aug 2026 09:30:33 -0300 Date: Wed, 12 Aug 2026 09:30:33 -0300 From: Jason Gunthorpe To: Yu Zhang Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, iommu@lists.linux.dev, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org, wei.liu@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, decui@microsoft.com, longli@microsoft.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, bhelgaas@google.com, kwilczynski@kernel.org, lpieralisi@kernel.org, mani@kernel.org, robh@kernel.org, arnd@arndb.de, mhklinux@outlook.com, jacob.pan@linux.microsoft.com, tgopinath@linux.microsoft.com, easwar.hariharan@linux.microsoft.com, mrathor@linux.microsoft.com, baolu.lu@linux.intel.com, suravee.suthikulpanit@amd.com, vasant.hegde@amd.com Subject: Re: [PATCH v3 3/5] iommu/x86: Share the architectural MSI reserved range Message-ID: <20260812123033.GB662699@ziepe.ca> References: <20260811155022.108148-1-zhangyu1@linux.microsoft.com> <20260811155022.108148-4-zhangyu1@linux.microsoft.com> <20260811162124.GK544626@ziepe.ca> Precedence: bulk X-Mailing-List: linux-pci@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: On Wed, Aug 12, 2026 at 04:58:28PM +0800, Yu Zhang wrote: > Thank you, Jason! > Do you mean something like below? > > -#define X86_IOMMU_MSI_RANGE_START 0xfee00000 > -#define X86_IOMMU_MSI_RANGE_END 0xfeefffff > +static inline struct iommu_resv_region * > +iommu_alloc_resv_x86_msi_region(void) > +{ > + return iommu_alloc_resv_region(0xfee00000, SZ_1M, 0, > + IOMMU_RESV_MSI, GFP_KERNEL); > +} Yeah something like that. Jason