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Fri, 07 Oct 2022 06:27:53 -0700 (PDT) From: Oleksandr Tyshchenko To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Oleksandr Tyshchenko , Stefano Stabellini , Juergen Gross , Xenia Ragiadakou Subject: [PATCH] xen/virtio: Handle cases when page offset > PAGE_SIZE properly Date: Fri, 7 Oct 2022 16:27:36 +0300 Message-Id: <20221007132736.2275574-1-olekstysh@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1665149298483100001 Content-Type: text/plain; charset="utf-8" From: Oleksandr Tyshchenko Passed to xen_grant_dma_map_page() offset in the page can be > PAGE_SIZE even if the guest uses the same page granularity as Xen (4KB). Before current patch, if such case happened we ended up providing grants for the whole region in xen_grant_dma_map_page() which was really unnecessary. The more, we ended up not releasing all grants which represented that region in xen_grant_dma_unmap_page(). Current patch updates the code to be able to deal with such cases. Signed-off-by: Oleksandr Tyshchenko Reviewed-by: Juergen Gross --- Cc: Juergen Gross Cc: Xenia Ragiadakou Depens on: https://lore.kernel.org/xen-devel/20221005174823.1800761-1-olekstysh@gmail.= com/ Should go in only after that series. --- drivers/xen/grant-dma-ops.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c index c66f56d24013..1385f0e686fe 100644 --- a/drivers/xen/grant-dma-ops.c +++ b/drivers/xen/grant-dma-ops.c @@ -168,7 +168,9 @@ static dma_addr_t xen_grant_dma_map_page(struct device = *dev, struct page *page, unsigned long attrs) { struct xen_grant_dma_data *data; - unsigned int i, n_pages =3D PFN_UP(offset + size); + unsigned long dma_offset =3D offset_in_page(offset), + gfn_offset =3D PFN_DOWN(offset); + unsigned int i, n_pages =3D PFN_UP(dma_offset + size); grant_ref_t grant; dma_addr_t dma_handle; =20 @@ -187,10 +189,10 @@ static dma_addr_t xen_grant_dma_map_page(struct devic= e *dev, struct page *page, =20 for (i =3D 0; i < n_pages; i++) { gnttab_grant_foreign_access_ref(grant + i, data->backend_domid, - xen_page_to_gfn(page) + i, dir =3D=3D DMA_TO_DEVICE); + xen_page_to_gfn(page) + i + gfn_offset, dir =3D=3D DMA_TO_DEVICE); } =20 - dma_handle =3D grant_to_dma(grant) + offset; + dma_handle =3D grant_to_dma(grant) + dma_offset; =20 return dma_handle; } --=20 2.25.1