Commit ec4001c3 authored by Paul Durrant's avatar Paul Durrant Committed by Boris Ostrovsky

xen: support priv-mapping in an HVM tools domain

If the domain has XENFEAT_auto_translated_physmap then use of the PV-
specific HYPERVISOR_mmu_update hypercall is clearly incorrect.

This patch adds checks in xen_remap_domain_gfn_array() and
xen_unmap_domain_gfn_array() which call through to the approprate
xlate_mmu function if the feature is present. A check is also added
to xen_remap_domain_gfn_range() to fail with -EOPNOTSUPP since this
should not be used in an HVM tools domain.
Signed-off-by: default avatarPaul Durrant <paul.durrant@citrix.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 773aaadc
......@@ -172,6 +172,9 @@ int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
pgprot_t prot, unsigned domid,
struct page **pages)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return -EOPNOTSUPP;
return do_remap_gfn(vma, addr, &gfn, nr, NULL, prot, domid, pages);
}
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
......@@ -182,6 +185,10 @@ int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
int *err_ptr, pgprot_t prot,
unsigned domid, struct page **pages)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
prot, domid, pages);
/* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
* and the consequences later is quite hard to detect what the actual
* cause of "wrong memory was mapped in".
......@@ -193,9 +200,12 @@ EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
/* Returns: 0 success */
int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
int numpgs, struct page **pages)
int nr, struct page **pages)
{
if (!pages || !xen_feature(XENFEAT_auto_translated_physmap))
if (xen_feature(XENFEAT_auto_translated_physmap))
return xen_xlate_unmap_gfn_range(vma, nr, pages);
if (!pages)
return 0;
return -EINVAL;
......
......@@ -104,6 +104,8 @@ int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
struct page **pages);
int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
int numpgs, struct page **pages);
#ifdef CONFIG_XEN_AUTO_XLATE
int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
unsigned long addr,
xen_pfn_t *gfn, int nr,
......@@ -112,6 +114,28 @@ int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
struct page **pages);
int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
int nr, struct page **pages);
#else
/*
* These two functions are called from arch/x86/xen/mmu.c and so stubs
* are needed for a configuration not specifying CONFIG_XEN_AUTO_XLATE.
*/
static inline int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
unsigned long addr,
xen_pfn_t *gfn, int nr,
int *err_ptr, pgprot_t prot,
unsigned int domid,
struct page **pages)
{
return -EOPNOTSUPP;
}
static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
int nr, struct page **pages)
{
return -EOPNOTSUPP;
}
#endif
int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
unsigned long nr_grant_frames);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment