[lkml]   [2018]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[RFC PATCH 05/11] powerpc/svm: Don't release SWIOTLB buffers on secure guests
From: Anshuman Khandual <>

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 <>
Signed-off-by: Thiago Jung Bauermann <>
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;

return 0;
 \ /
  Last update: 2018-08-24 18:27    [W:0.109 / U:5.580 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site