From efaf30a3357872cf0fc7d555b1f9968ec71535d3 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 6 Jan 2014 10:40:36 -0500 Subject: xen/grant: Implement an grant frame array struct (v3). The 'xen_hvm_resume_frames' used to be an 'unsigned long' and contain the virtual address of the grants. That was OK for most architectures (PVHVM, ARM) were the grants are contiguous in memory. That however is not the case for PVH - in which case we will have to do a lookup for each virtual address for the PFN. Instead of doing that, lets make it a structure which will contain the array of PFNs, the virtual address and the count of said PFNs. Also provide a generic functions: gnttab_setup_auto_xlat_frames and gnttab_free_auto_xlat_frames to populate said structure with appropriate values for PVHVM and ARM. To round it off, change the name from 'xen_hvm_resume_frames' to a more descriptive one - 'xen_auto_xlat_grant_frames'. For PVH, in patch "xen/pvh: Piggyback on PVHVM for grant driver" we will populate the 'xen_auto_xlat_grant_frames' by ourselves. v2 moves the xen_remap in the gnttab_setup_auto_xlat_frames and also introduces xen_unmap for gnttab_free_auto_xlat_frames. Suggested-by: Stefano Stabellini Signed-off-by: Konrad Rzeszutek Wilk [v3: Based on top of 'asm/xen/page.h: remove redundant semicolon'] Acked-by: Stefano Stabellini --- arch/arm/xen/enlighten.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'arch/arm/xen/enlighten.c') diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 85501238b425..2162172c0ddc 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -208,6 +208,7 @@ static int __init xen_guest_init(void) const char *version = NULL; const char *xen_prefix = "xen,xen-"; struct resource res; + unsigned long grant_frames; node = of_find_compatible_node(NULL, NULL, "xen,xen"); if (!node) { @@ -224,10 +225,10 @@ static int __init xen_guest_init(void) } if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) return 0; - xen_hvm_resume_frames = res.start; + grant_frames = res.start; xen_events_irq = irq_of_parse_and_map(node, 0); pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n", - version, xen_events_irq, (xen_hvm_resume_frames >> PAGE_SHIFT)); + version, xen_events_irq, (grant_frames >> PAGE_SHIFT)); xen_domain_type = XEN_HVM_DOMAIN; xen_setup_features(); @@ -265,6 +266,10 @@ static int __init xen_guest_init(void) if (xen_vcpu_info == NULL) return -ENOMEM; + if (gnttab_setup_auto_xlat_frames(grant_frames)) { + free_percpu(xen_vcpu_info); + return -ENOMEM; + } gnttab_init(); if (!xen_initial_domain()) xenbus_probe(NULL); -- cgit v1.2.3