linux-kernel - [PATCH] vfio: account iommu allocations

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Date:   Thu, 30 Nov 2023 20:09:00 +0000
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        pasha.tatashin@...een.com, alex.williamson@...hat.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] vfio: account iommu allocations

iommu allocations should be accounted in order to allow admins to
monitor and limit the amount of iommu memory.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 drivers/vfio/vfio_iommu_type1.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

This patch is spinned of from the series:
https://lore.kernel.org/all/20231128204938.1453583-1-pasha.tatashin@soleen.com

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index eacd6ec04de5..b2854d7939ce 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1436,7 +1436,7 @@ static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
 	list_for_each_entry(d, &iommu->domain_list, next) {
 		ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
 				npage << PAGE_SHIFT, prot | IOMMU_CACHE,
-				GFP_KERNEL);
+				GFP_KERNEL_ACCOUNT);
 		if (ret)
 			goto unwind;
 
@@ -1750,7 +1750,8 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
 			}
 
 			ret = iommu_map(domain->domain, iova, phys, size,
-					dma->prot | IOMMU_CACHE, GFP_KERNEL);
+					dma->prot | IOMMU_CACHE,
+					GFP_KERNEL_ACCOUNT);
 			if (ret) {
 				if (!dma->iommu_mapped) {
 					vfio_unpin_pages_remote(dma, iova,
@@ -1845,7 +1846,8 @@ static void vfio_test_domain_fgsp(struct vfio_domain *domain, struct list_head *
 			continue;
 
 		ret = iommu_map(domain->domain, start, page_to_phys(pages), PAGE_SIZE * 2,
-				IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE, GFP_KERNEL);
+				IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE,
+				GFP_KERNEL_ACCOUNT);
 		if (!ret) {
 			size_t unmapped = iommu_unmap(domain->domain, start, PAGE_SIZE);
 
-- 
2.43.0.rc2.451.g8631bc7472-goog