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

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Date:   Mon, 4 Dec 2023 17:00:52 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio: account iommu allocations

On Thu, 30 Nov 2023 20:09:00 +0000
Pasha Tatashin <pasha.tatashin@...een.com> wrote:

> 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);
>  

Applied to vfio next branch for v6.8.  Thanks,

Alex