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b=KDSOdCapyD9dyejwgJuyqWgj8y/L5sgmWAOZfV5ATwLYJbSEBSI8VfC91FlUDc4IfQ7p5V8VFHPlGe3LPPUGuSh8augzPH0XDBuXsRHRK0CuZNwDO9HcQqV1Ir/PKRqF1qmbR5tzOzRlDh2ydNYwU+9neS5WkWZ0x2RmI8hs9XzH5F6GQx1Q0gyNQX5Zy2ZyhgXO0YxY3jOpdZ8uVmWoFngeGmUBhzOSdjh1dal88Q9fzMKachhW2hHCz+/luCL639698r9w/xffICyU5XBKdLLlx7uZ5vtaWYm161NnPDD0Old3q7FzZxcxlb1TCu4hTrnxcNkr4PealEF3yr4BIQ== From: Milan Djokic To: "xen-devel@lists.xenproject.org" CC: Rahul Singh , Bertrand Marquis , Stefano Stabellini , Julien Grall , Michal Orzel , Volodymyr Babchuk , Milan Djokic Subject: [PATCH v2 03/23] xen/arm: smmuv3: Alloc io_domain for each device Thread-Topic: [PATCH v2 03/23] xen/arm: smmuv3: Alloc io_domain for each device Thread-Index: AQHcuxeQDJJ467Fpv0mX/F/Xkhss4A== Date: Mon, 23 Mar 2026 22:51:20 +0000 Message-ID: <213efdf828034e421b79cd8ae203b081b839663e.1774305918.git.milan_djokic@epam.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=epam.com; 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charset="utf-8" From: Rahul Singh In current implementation io_domain is allocated once for each xen domain as Stage2 translation is common for all devices in same xen domain. Nested stage supports S1 and S2 configuration at the same time. Stage1 translation will be different for each device as linux kernel will allocate page-table for each device. Alloc io_domain for each device so that each device can have different Stage-1 and Stage-2 configuration structure. Signed-off-by: Rahul Singh Signed-off-by: Milan Djokic --- xen/drivers/passthrough/arm/smmu-v3.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/xen/drivers/passthrough/arm/smmu-v3.c b/xen/drivers/passthroug= h/arm/smmu-v3.c index f9c6837919..19e55b6c9b 100644 --- a/xen/drivers/passthrough/arm/smmu-v3.c +++ b/xen/drivers/passthrough/arm/smmu-v3.c @@ -2809,11 +2809,13 @@ static struct arm_smmu_device *arm_smmu_get_by_dev(= const struct device *dev) static struct iommu_domain *arm_smmu_get_domain(struct domain *d, struct device *dev) { + unsigned long flags; struct iommu_domain *io_domain; struct arm_smmu_domain *smmu_domain; struct iommu_fwspec *fwspec =3D dev_iommu_fwspec_get(dev); struct arm_smmu_xen_domain *xen_domain =3D dom_iommu(d)->arch.priv; struct arm_smmu_device *smmu =3D arm_smmu_get_by_dev(fwspec->iommu_dev); + struct arm_smmu_master *master; =20 if (!smmu) return NULL; @@ -2824,8 +2826,15 @@ static struct iommu_domain *arm_smmu_get_domain(stru= ct domain *d, */ list_for_each_entry(io_domain, &xen_domain->contexts, list) { smmu_domain =3D to_smmu_domain(io_domain); - if (smmu_domain->smmu =3D=3D smmu) - return io_domain; + + spin_lock_irqsave(&smmu_domain->devices_lock, flags); + list_for_each_entry(master, &smmu_domain->devices, domain_head) { + if (master->dev =3D=3D dev) { + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); + return io_domain; + } + } + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); } return NULL; } --=20 2.43.0