From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Anshuman Khandual <anshuman.linux@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christoph Hellwig <hch@lst.de>,
Michael Ellerman <mpe@ellerman.id.au>,
Mike Anderson <andmike@linux.ibm.com>,
Paul Mackerras <paulus@samba.org>, Ram Pai <linuxram@us.ibm.com>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: [RFC PATCH 05/11] powerpc/svm: Don't release SWIOTLB buffers on secure guests
Date: Fri, 24 Aug 2018 13:25:29 -0300 [thread overview]
Message-ID: <20180824162535.22798-6-bauerman@linux.ibm.com> (raw)
In-Reply-To: <20180824162535.22798-1-bauerman@linux.ibm.com>
From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Even though SWIOTLB slab gets allocated and initialized on each powerpc
platform with swiotlb_init(), it gets released away again on all server
platforms because ppc_swiotlb_enable variable never gets set. Secure
guests would require SWIOTLB DMA API support for virtio bounce buffering
purpose. Hence retain the allocated buffer by setting ppc_swiotlb_enable
variable for secure guests on Ultravisor platforms.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
arch/powerpc/kernel/svm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/kernel/svm.c b/arch/powerpc/kernel/svm.c
index eab2a64d8643..891db2de8c04 100644
--- a/arch/powerpc/kernel/svm.c
+++ b/arch/powerpc/kernel/svm.c
@@ -16,6 +16,7 @@ static int __init init_svm(void)
if (!is_svm_platform())
return 0;
+ ppc_swiotlb_enable = 1;
swiotlb_update_mem_attributes();
return 0;
next prev parent reply other threads:[~2018-08-24 16:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-24 16:25 [RFC PATCH 00/11] Secure Virtual Machine Enablement Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 01/11] powerpc/svm: Detect Secure Virtual Machine (SVM) platform Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 02/11] powerpc/svm: Select CONFIG_DMA_DIRECT_OPS and CONFIG_SWIOTLB Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 03/11] powerpc/svm: Add memory conversion (shared/secure) helper functions Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 04/11] powerpc/svm: Convert SWIOTLB buffers to shared memory Thiago Jung Bauermann
2018-08-24 16:25 ` Thiago Jung Bauermann [this message]
2018-08-24 16:25 ` [RFC PATCH 06/11] powerpc/svm: Use SWIOTLB DMA API for all virtio devices Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 07/11] powerpc/svm: Use shared memory for Debug Trace Log (DTL) Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 08/11] powerpc: Add and use LPPACA_SIZE constant Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 09/11] powerpc/svm: Use shared memory for LPPACA structures Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 10/11] powerpc/svm: Force the use of bounce buffers Thiago Jung Bauermann
2018-08-24 16:25 ` [RFC PATCH 11/11] powerpc/svm: Increase SWIOTLB buffer size Thiago Jung Bauermann
2018-08-24 17:16 ` Randy Dunlap
[not found] ` <45561478-ee75-ee62-52d6-a96d60132669-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-08-25 0:38 ` Thiago Jung Bauermann
2018-08-27 18:18 ` Konrad Rzeszutek Wilk
2018-08-24 16:33 ` [RFC PATCH 00/11] Secure Virtual Machine Enablement Christoph Hellwig
2018-08-24 18:16 ` Ram Pai
2019-09-04 2:48 ` Sukadev Bhattiprolu
-- strict thread matches above, loose matches on Subject: below --
2018-08-24 2:59 Thiago Jung Bauermann
2018-08-24 2:59 ` [RFC PATCH 05/11] powerpc/svm: Don't release SWIOTLB buffers on secure guests Thiago Jung Bauermann
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