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: Wed, 12 Aug 2026 09:30:33 -0300 [thread overview]
Message-ID: <20260812123033.GB662699@ziepe.ca> (raw)
In-Reply-To: <obiixds667qdhv5upqdpxmgrvrvp3bl5gfbpingvog2vzbexhg@b7n4fpfbkff5>
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
next prev parent reply other threads:[~2026-08-12 12:30 UTC|newest]
Thread overview: 10+ 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
2026-08-12 18:08 ` Jacob Pan
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
2026-08-12 8:58 ` Yu Zhang
2026-08-12 12:30 ` 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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