[AMD Public Use] + Felix, Christian
> -----Original Message----- > From: Joerg Roedel <j...@8bytes.org> > Sent: Monday, August 24, 2020 6:54 AM > To: io...@lists.linux-foundation.org > Cc: Joerg Roedel <j...@8bytes.org>; jroe...@suse.de; Lendacky, Thomas > <thomas.lenda...@amd.com>; Suthikulpanit, Suravee > <suravee.suthikulpa...@amd.com>; Deucher, Alexander > <alexander.deuc...@amd.com>; linux-kernel@vger.kernel.org > Subject: [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when > SME is active > > From: Joerg Roedel <jroe...@suse.de> > > When memory encryption is active the device is likely not in a direct mapped > domain. Forbid using IOMMUv2 functionality for now until finer grained > checks for this have been implemented. > > Signed-off-by: Joerg Roedel <jroe...@suse.de> > --- > drivers/iommu/amd/iommu_v2.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/iommu/amd/iommu_v2.c > b/drivers/iommu/amd/iommu_v2.c index c259108ab6dd..0d175aed1d92 > 100644 > --- a/drivers/iommu/amd/iommu_v2.c > +++ b/drivers/iommu/amd/iommu_v2.c > @@ -737,6 +737,13 @@ int amd_iommu_init_device(struct pci_dev *pdev, > int pasids) > > might_sleep(); > > + /* > + * When memory encryption is active the device is likely not in a > + * direct-mapped domain. Forbid using IOMMUv2 functionality for > now. > + */ > + if (mem_encrypt_active()) > + return -ENODEV; > + > if (!amd_iommu_v2_supported()) > return -ENODEV; > > -- > 2.28.0
