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Wed, 11 Aug 2021 06:03:58 -0700 (PDT) From: Oleksandr Andrushchenko To: sstabellini@kernel.org, julien@xen.org, Volodymyr_Babchuk@epam.com, xen-devel@lists.xenproject.org Cc: Oleksandr Andrushchenko , Oleksandr Tyshchenko Subject: [PATCH] xen/arm: smmu: Set/clear IOMMU domain for device Date: Wed, 11 Aug 2021 16:03:56 +0300 Message-Id: <20210811130356.1143743-1-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1628687070006100001 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko When a device is assigned/de-assigned it is required to properly set IOMMU domain used to protect the device. This assignment was missing, thus it was not possible to de-assign the device: (XEN) Deassigning device 0000:03:00.0 from dom2 (XEN) smmu: 0000:03:00.0: not attached to domain 2 (XEN) d2: deassign (0000:03:00.0) failed (-3) Fix this by assigning IOMMU domain on arm_smmu_assign_dev and reset it to NULL on arm_smmu_deassign_dev. Signed-off-by: Oleksandr Andrushchenko Signed-off-by: Oleksandr Tyshchenko Reviewed-by: Rahul Singh --- xen/drivers/passthrough/arm/smmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/a= rm/smmu.c index c234ad9c7f1e..373d9d4d123a 100644 --- a/xen/drivers/passthrough/arm/smmu.c +++ b/xen/drivers/passthrough/arm/smmu.c @@ -2768,6 +2768,7 @@ static int arm_smmu_assign_dev(struct domain *d, u8 d= evfn, arm_smmu_destroy_iommu_domain(domain); } else { atomic_inc(&domain->ref); + dev_iommu_domain(dev) =3D domain; } =20 out: @@ -2794,7 +2795,10 @@ static int arm_smmu_deassign_dev(struct domain *d, s= truct device *dev) atomic_dec(&domain->ref); =20 if (domain->ref.counter =3D=3D 0) + { arm_smmu_destroy_iommu_domain(domain); + dev_iommu_domain(dev) =3D NULL; + } =20 spin_unlock(&xen_domain->lock); =20 --=20 2.25.1