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xen: allow privcmd for HVM guests 

This patch removes the "return -ENOSYS" for auto_translated_physmap
guests from privcmd_mmap, thus it allows ARM guests to issue privcmd
mmap calls. However privcmd mmap calls are still going to fail for HVM
and hybrid guests on x86 because the xen_remap_domain_mfn_range
implementation is currently PV only.

Changes in v2:

- better commit message;
- return -EINVAL from xen_remap_domain_mfn_range if
  auto_translated_physmap.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-08-22 17:20:16 +01:00 committed by Konrad Rzeszutek Wilk
parent bd3f79b71d
commit 1a1d43318a
2 changed files with 3 additions and 4 deletions
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3
arch/x86/xen/mmu.c
View File

@ -2310,6 +2310,9 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long range; unsigned long range;
int err = 0; int err = 0;
if (xen_feature(XENFEAT_auto_translated_physmap))
return -EINVAL;
prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP); prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_RESERVED | VM_IO)) == BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_RESERVED | VM_IO)) ==

4
drivers/xen/privcmd.c
View File

@ -380,10 +380,6 @@ static struct vm_operations_struct privcmd_vm_ops = {
static int privcmd_mmap(struct file *file, struct vm_area_struct *vma) static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
{ {
/* Unsupported for auto-translate guests. */
if (xen_feature(XENFEAT_auto_translated_physmap))
return -ENOSYS;
/* DONTCOPY is essential for Xen because copy_page_range doesn't know /* DONTCOPY is essential for Xen because copy_page_range doesn't know
* how to recreate these mappings */ * how to recreate these mappings */
vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY | VM_PFNMAP; vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY | VM_PFNMAP;