* [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed
@ 2018-06-06 2:18 Zhen Lei
[not found] ` <1528251526-11408-1-git-send-email-thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-07-06 11:21 ` Joerg Roedel
0 siblings, 2 replies; 4+ messages in thread
From: Zhen Lei @ 2018-06-06 2:18 UTC (permalink / raw)
To: Joerg Roedel, iommu, linux-kernel; +Cc: Zhen Lei, Robin Murphy
Although the mapping has already been removed in the page table, it maybe
still exist in TLB. Suppose the freed IOVAs is reused by others before the
flush operation completed, the new user can not correctly access to its
meomory.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
drivers/iommu/amd_iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 8fb8c73..93aa389 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2402,9 +2402,9 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
}
if (amd_iommu_unmap_flush) {
- dma_ops_free_iova(dma_dom, dma_addr, pages);
domain_flush_tlb(&dma_dom->domain);
domain_flush_complete(&dma_dom->domain);
+ dma_ops_free_iova(dma_dom, dma_addr, pages);
} else {
pages = __roundup_pow_of_two(pages);
queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0);
--
1.8.3
^ permalink raw reply related [flat|nested] 4+ messages in thread[parent not found: <1528251526-11408-1-git-send-email-thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>]
* Re: [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed
2018-06-06 2:18 [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed Zhen Lei
@ 2018-06-21 6:08 ` Leizhen (ThunderTown)
2018-07-06 11:21 ` Joerg Roedel
1 sibling, 0 replies; 4+ messages in thread
From: Leizhen (ThunderTown) @ 2018-06-21 6:08 UTC (permalink / raw)
To: Joerg Roedel, iommu, linux-kernel
Hi Joerg:
Can you take a look at it?
On 2018/6/6 10:18, Zhen Lei wrote:
> Although the mapping has already been removed in the page table, it maybe
> still exist in TLB. Suppose the freed IOVAs is reused by others before the
> flush operation completed, the new user can not correctly access to its
> meomory.
>
> Signed-off-by: Zhen Lei <thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
> ---
> drivers/iommu/amd_iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 8fb8c73..93aa389 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -2402,9 +2402,9 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
> }
>
> if (amd_iommu_unmap_flush) {
> - dma_ops_free_iova(dma_dom, dma_addr, pages);
> domain_flush_tlb(&dma_dom->domain);
> domain_flush_complete(&dma_dom->domain);
> + dma_ops_free_iova(dma_dom, dma_addr, pages);
> } else {
> pages = __roundup_pow_of_two(pages);
> queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0);
> --
> 1.8.3
>
>
>
> .
>
--
Thanks!
BestRegards
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed
@ 2018-06-21 6:08 ` Leizhen (ThunderTown)
0 siblings, 0 replies; 4+ messages in thread
From: Leizhen (ThunderTown) @ 2018-06-21 6:08 UTC (permalink / raw)
To: Joerg Roedel, iommu, linux-kernel; +Cc: Robin Murphy
Hi Joerg:
Can you take a look at it?
On 2018/6/6 10:18, Zhen Lei wrote:
> Although the mapping has already been removed in the page table, it maybe
> still exist in TLB. Suppose the freed IOVAs is reused by others before the
> flush operation completed, the new user can not correctly access to its
> meomory.
>
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> ---
> drivers/iommu/amd_iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 8fb8c73..93aa389 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -2402,9 +2402,9 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
> }
>
> if (amd_iommu_unmap_flush) {
> - dma_ops_free_iova(dma_dom, dma_addr, pages);
> domain_flush_tlb(&dma_dom->domain);
> domain_flush_complete(&dma_dom->domain);
> + dma_ops_free_iova(dma_dom, dma_addr, pages);
> } else {
> pages = __roundup_pow_of_two(pages);
> queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0);
> --
> 1.8.3
>
>
>
> .
>
--
Thanks!
BestRegards
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed
2018-06-06 2:18 [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed Zhen Lei
[not found] ` <1528251526-11408-1-git-send-email-thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
@ 2018-07-06 11:21 ` Joerg Roedel
1 sibling, 0 replies; 4+ messages in thread
From: Joerg Roedel @ 2018-07-06 11:21 UTC (permalink / raw)
To: Zhen Lei; +Cc: iommu, linux-kernel, Robin Murphy
On Wed, Jun 06, 2018 at 10:18:46AM +0800, Zhen Lei wrote:
> Although the mapping has already been removed in the page table, it maybe
> still exist in TLB. Suppose the freed IOVAs is reused by others before the
> flush operation completed, the new user can not correctly access to its
> meomory.
>
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> ---
> drivers/iommu/amd_iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-06-06 2:18 [PATCH 1/1] iommu/amd: make sure TLB to be flushed before IOVA freed Zhen Lei
[not found] ` <1528251526-11408-1-git-send-email-thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-06-21 6:08 ` Leizhen (ThunderTown)
2018-06-21 6:08 ` Leizhen (ThunderTown)
2018-07-06 11:21 ` Joerg Roedel
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