From 035e3a4321f73c352b6408ec2153fa5bc3feb459 Mon Sep 17 00:00:00 2001 From: Oleksandr Tyshchenko Date: Tue, 25 Oct 2022 19:20:03 +0300 Subject: 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 Reviewed-by: Xenia Ragiadakou Reviewed-by: Stefano Stabellini Link: https://lore.kernel.org/r/20221025162004.8501-2-olekstysh@gmail.com Signed-off-by: Juergen Gross --- arch/arm/xen/enlighten.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm') 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(); -- cgit v1.2.3-70-g09d2