From: Lu Baolu <baolu.lu@linux.intel.com> To: Ning Sun <ning.sun@intel.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Will Deacon <will@kernel.org>, Joerg Roedel <joro@8bytes.org> Cc: Ashok Raj <ashok.raj@intel.com>, x86@kernel.org, tboot-devel@lists.sourceforge.net, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>, Adrian Huang <ahuang12@lenovo.com> Subject: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on Date: Wed, 25 Nov 2020 09:41:24 +0800 [thread overview] Message-ID: <20201125014124.4070776-1-baolu.lu@linux.intel.com> (raw) After commit 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA domain"), swiotbl could also be used for direct memory access if IOMMU is enabled but a device is configured to pass through the DMA translation. Keep swiotlb when IOMMU is forced on, otherwise, some devices won't work if "iommu=pt" kernel parameter is used. Fixes: 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA domain") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=210237 Reported-and-tested-by: Adrian Huang <ahuang12@lenovo.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- arch/x86/kernel/tboot.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 420be871d9d4..ae64f98ec2ab 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -514,13 +514,10 @@ int tboot_force_iommu(void) if (!tboot_enabled()) return 0; - if (no_iommu || swiotlb || dmar_disabled) + if (no_iommu || dmar_disabled) pr_warn("Forcing Intel-IOMMU to enabled\n"); dmar_disabled = 0; -#ifdef CONFIG_SWIOTLB - swiotlb = 0; -#endif no_iommu = 0; return 1; -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com> To: Ning Sun <ning.sun@intel.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Will Deacon <will@kernel.org>, Joerg Roedel <joro@8bytes.org> Cc: Ashok Raj <ashok.raj@intel.com>, x86@kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, tboot-devel@lists.sourceforge.net, Adrian Huang <ahuang12@lenovo.com> Subject: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on Date: Wed, 25 Nov 2020 09:41:24 +0800 [thread overview] Message-ID: <20201125014124.4070776-1-baolu.lu@linux.intel.com> (raw) After commit 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA domain"), swiotbl could also be used for direct memory access if IOMMU is enabled but a device is configured to pass through the DMA translation. Keep swiotlb when IOMMU is forced on, otherwise, some devices won't work if "iommu=pt" kernel parameter is used. Fixes: 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA domain") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=210237 Reported-and-tested-by: Adrian Huang <ahuang12@lenovo.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- arch/x86/kernel/tboot.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 420be871d9d4..ae64f98ec2ab 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -514,13 +514,10 @@ int tboot_force_iommu(void) if (!tboot_enabled()) return 0; - if (no_iommu || swiotlb || dmar_disabled) + if (no_iommu || dmar_disabled) pr_warn("Forcing Intel-IOMMU to enabled\n"); dmar_disabled = 0; -#ifdef CONFIG_SWIOTLB - swiotlb = 0; -#endif no_iommu = 0; return 1; -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next reply other threads:[~2020-11-25 1:48 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-25 1:41 Lu Baolu [this message] 2020-11-25 1:41 ` [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on Lu Baolu 2020-11-25 14:05 ` Will Deacon 2020-11-25 14:05 ` Will Deacon 2020-11-25 15:41 ` Konrad Rzeszutek Wilk 2020-11-25 15:41 ` Konrad Rzeszutek Wilk 2020-11-25 15:51 ` Will Deacon 2020-11-25 15:51 ` Will Deacon 2020-11-25 16:25 ` Konrad Rzeszutek Wilk 2020-11-25 16:25 ` Konrad Rzeszutek Wilk
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