Messages in this thread Patch in this message | | | From | Tianyu Lan <> | Subject | [PATCH V2 2/2] x86/hyperv: Make swiotlb bounce buffer allocation not just from low pages | Date | Wed, 9 Feb 2022 07:23:02 -0500 |
| |
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
In Hyper-V Isolation VM, swiotlb bnounce buffer size maybe 1G at most and there maybe no enough memory from 0 to 4G according to memory layout. Devices in Isolation VM can use memory above 4G as DMA memory and call swiotlb_alloc_from_low_pages() to allocate swiotlb bounce buffer not limit from 0 to 4G.
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com> --- arch/x86/kernel/cpu/mshyperv.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 5a99f993e639..50ba4622c650 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -343,6 +343,7 @@ static void __init ms_hyperv_init_platform(void) * use swiotlb bounce buffer for dma transaction. */ swiotlb_force = SWIOTLB_FORCE; + swiotlb_set_alloc_from_low_pages(false); #endif } -- 2.25.1
| |