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| author |   David Vrabel <david.vrabel@citrix.com> | 2015-07-22 14:50:37 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-10-23 14:20:31 +0100 |
| commit | 4a69c909deb0dd3cae653d14ac0ff52d5440a19c (patch) | |
| tree | 13c9a6a80d575d706e8b689604047d0591ffad91 /drivers/xen | |
| parent | x86/xen: export xen_alloc_p2m_entry() (diff) | |
| download | linux-dev-4a69c909deb0dd3cae653d14ac0ff52d5440a19c.tar.xz linux-dev-4a69c909deb0dd3cae653d14ac0ff52d5440a19c.zip | |
xen/balloon: pre-allocate p2m entries for ballooned pages
Pages returned by alloc_xenballooned_pages() will be used for grant
mapping which will call set_phys_to_machine() (in PV guests).
Ballooned pages are set as INVALID_P2M_ENTRY in the p2m and thus may
be using the (shared) missing tables and a subsequent
set_phys_to_machine() will need to allocate new tables.
Since the grant mapping may be done from a context that cannot sleep,
the p2m entries must already be allocated.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/balloon.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 25fd1bd949d8..f56662324a47 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -602,6 +602,11 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages) page = balloon_retrieve(true); if (page) { pages[pgno++] = page; +#ifdef CONFIG_XEN_HAVE_PVMMU + ret = xen_alloc_p2m_entry(page_to_pfn(page)); + if (ret < 0) + goto out_undo; +#endif } else { ret = add_ballooned_pages(nr_pages - pgno); if (ret < 0) |