* [PATCH trivial] iommu/amd: Do not allocate io_pgtable_ops for passthrough domain
@ 2023-01-05 9:17 Vasant Hegde
2023-01-13 16:02 ` Joerg Roedel
0 siblings, 1 reply; 2+ messages in thread
From: Vasant Hegde @ 2023-01-05 9:17 UTC (permalink / raw)
To: iommu, joro; +Cc: suravee.suthikulpanit, Vasant Hegde
In passthrough mode we do not use IOMMU page table. Hence we don't need
to allocate io_pgtable_ops.
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
drivers/iommu/amd/iommu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index acc5e5e4f9e2..5aa54249387e 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2079,6 +2079,10 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
if (ret)
goto out_err;
+ /* No need to allocate io pgtable ops in passthrough mode */
+ if (type == IOMMU_DOMAIN_IDENTITY)
+ return domain;
+
pgtbl_ops = alloc_io_pgtable_ops(pgtable, &domain->iop.pgtbl_cfg, domain);
if (!pgtbl_ops) {
domain_id_free(domain->id);
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH trivial] iommu/amd: Do not allocate io_pgtable_ops for passthrough domain
2023-01-05 9:17 [PATCH trivial] iommu/amd: Do not allocate io_pgtable_ops for passthrough domain Vasant Hegde
@ 2023-01-13 16:02 ` Joerg Roedel
0 siblings, 0 replies; 2+ messages in thread
From: Joerg Roedel @ 2023-01-13 16:02 UTC (permalink / raw)
To: Vasant Hegde; +Cc: iommu, suravee.suthikulpanit
On Thu, Jan 05, 2023 at 09:17:28AM +0000, Vasant Hegde wrote:
> drivers/iommu/amd/iommu.c | 4 ++++
> 1 file changed, 4 insertions(+)
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-01-05 9:17 [PATCH trivial] iommu/amd: Do not allocate io_pgtable_ops for passthrough domain Vasant Hegde
2023-01-13 16:02 ` Joerg Roedel
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