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authorOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>2022-10-25 19:20:03 +0300
committerJuergen Gross <jgross@suse.com>2022-12-05 14:59:49 +0300
commit035e3a4321f73c352b6408ec2153fa5bc3feb459 (patch)
treeb4316270fadbeb589707275cbd607dda71a70e1d /arch/arm
parent76dcd734eca23168cb008912c0f69ff408905235 (diff)
downloadlinux-035e3a4321f73c352b6408ec2153fa5bc3feb459.tar.xz
xen/virtio: Optimize the setup of "xen-grant-dma" devices
This is needed to avoid having to parse the same device-tree several times for a given device. For this to work we need to install the xen_virtio_restricted_mem_acc callback in Arm's xen_guest_init() which is same callback as x86's PV and HVM modes already use and remove the manual assignment in xen_setup_dma_ops(). Also we need to split the code to initialize backend_domid into a separate function. Prior to current patch we parsed the device-tree three times: 1. xen_setup_dma_ops()->...->xen_is_dt_grant_dma_device() 2. xen_setup_dma_ops()->...->xen_dt_grant_init_backend_domid() 3. xen_virtio_mem_acc()->...->xen_is_dt_grant_dma_device() With current patch we parse the device-tree only once in xen_virtio_restricted_mem_acc()->...->xen_dt_grant_init_backend_domid() Other benefits are: - Not diverge from x86 when setting up Xen grant DMA ops - Drop several global functions Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Xenia Ragiadakou <burzalodowa@gmail.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20221025162004.8501-2-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/xen/enlighten.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 93c8ccbf2982..7d59765aef22 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -445,7 +445,7 @@ static int __init xen_guest_init(void)
return 0;
if (IS_ENABLED(CONFIG_XEN_VIRTIO))
- virtio_set_mem_acc_cb(xen_virtio_mem_acc);
+ virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc);
if (!acpi_disabled)
xen_acpi_guest_init();