From: Jason Gunthorpe <jgg@ziepe.ca>
To: Yu Zhang <zhangyu1@linux.microsoft.com>
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
Date: Tue, 11 Aug 2026 13:21:24 -0300 [thread overview]
Message-ID: <20260811162124.GK544626@ziepe.ca> (raw)
In-Reply-To: <20260811155022.108148-4-zhangyu1@linux.microsoft.com>
On Tue, Aug 11, 2026 at 11:50:19PM +0800, Yu Zhang wrote:
> @@ -50,8 +50,6 @@
> #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
>
> /* Reserved IOVA ranges */
> -#define MSI_RANGE_START (0xfee00000)
> -#define MSI_RANGE_END (0xfeefffff)
> #define HT_RANGE_START (0xfd00000000ULL)
> #define HT_RANGE_END (0xffffffffffULL)
>
> @@ -3097,8 +3095,9 @@ static void amd_iommu_get_resv_regions(struct device *dev,
> list_add_tail(®ion->list, head);
> }
>
> - region = iommu_alloc_resv_region(MSI_RANGE_START,
> - MSI_RANGE_END - MSI_RANGE_START + 1,
> + region = iommu_alloc_resv_region(X86_IOMMU_MSI_RANGE_START,
> + X86_IOMMU_MSI_RANGE_END -
> + X86_IOMMU_MSI_RANGE_START + 1,
> 0, IOMMU_RESV_MSI, GFP_KERNEL);
Maybe instead of adding constants you should add a
iommu_alloc_resv_x86_msi_region()
That is just an inline doing the above?
Jason
next prev parent reply other threads:[~2026-08-11 16:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-11 15:50 [PATCH v3 0/5] Hyper-V: Add para-virtualized IOMMU support for Linux guests Yu Zhang
2026-08-11 15:50 ` [PATCH v3 1/5] hyperv: Introduce new hypercall interfaces used by Hyper-V guest IOMMU Yu Zhang
2026-08-11 15:50 ` [PATCH v3 2/5] Drivers: hv: Add logical device ID registry for vPCI devices Yu Zhang
2026-08-11 15:50 ` [PATCH v3 3/5] iommu/x86: Share the architectural MSI reserved range Yu Zhang
2026-08-11 16:21 ` Jason Gunthorpe [this message]
2026-08-11 15:50 ` [PATCH v3 4/5] iommu/hyperv: Add para-virtualized IOMMU support for Hyper-V guest Yu Zhang
2026-08-11 15:50 ` [PATCH v3 5/5] iommu/hyperv: Add page-selective IOTLB flush support Yu Zhang
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