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arm/xen: Add support for 64KB page granularity

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The hypercall interface is always using 4KB page granularity. This is
requiring to use xen page definition macro when we deal with hypercall.

Note that pfn_to_gfn is working with a Xen pfn (i.e 4KB). We may want to
rename pfn_gfn to make this explicit.

We also allocate a 64KB page for the shared page even though only the
first 4KB is used. I don't think this is really important for now as it
helps to have the pointer 4KB aligned (XENMEM_add_to_physmap is taking a
Xen PFN).

Signed-off-by: Julien Grall <julien.grall@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Julien Grall 2015-05-05 16:36:56 +01:00 committed by David Vrabel
parent 5995a68a62
commit 250c9af3d8
2 changed files with 16 additions and 5 deletions
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15
arch/arm/include/asm/xen/page.h
View File

@ -28,6 +28,17 @@ typedef struct xpaddr {
#define INVALID_P2M_ENTRY (~0UL)
/*
* The pseudo-physical frame (pfn) used in all the helpers is always based
* on Xen page granularity (i.e 4KB).
*
* A Linux page may be split across multiple non-contiguous Xen page so we
* have to keep track with frame based on 4KB page granularity.
*
* PV drivers should never make a direct usage of those helpers (particularly
* pfn_to_gfn and gfn_to_pfn).
*/
unsigned long __pfn_to_mfn(unsigned long pfn);
extern struct rb_root phys_to_mach;
@ -64,8 +75,8 @@ static inline unsigned long bfn_to_pfn(unsigned long bfn)
#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
/* VIRT <-> GUEST conversion */
#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << PAGE_SHIFT))
#define virt_to_gfn(v) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
/* Only used in PV code. But ARM guests are always HVM. */
static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)

6
arch/arm/xen/enlighten.c
View File

@ -89,8 +89,8 @@ static void xen_percpu_init(void)
pr_info("Xen: initializing cpu%d\n", cpu);
vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
info.mfn = __pa(vcpup) >> PAGE_SHIFT;
info.offset = offset_in_page(vcpup);
info.mfn = virt_to_gfn(vcpup);
info.offset = xen_offset_in_page(vcpup);
err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
BUG_ON(err);
@ -213,7 +213,7 @@ static int __init xen_guest_init(void)
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
xatp.gpfn = virt_to_gfn(shared_info_page);
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();