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arm/xen: Add misuse warning to virt_to_gfn

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As virt_to_gfn uses virt_to_phys, it will return invalid addresses when
used with vmalloc'd addresses. This patch introduces a warning, when
virt_to_gfn is used in this way.

Signed-off-by: Simon Leiner <simon@leiner.me>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20200825093153.35500-2-simon@leiner.me
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Simon Leiner 2020-08-25 11:31:53 +02:00 committed by Juergen Gross
parent d742db7003
commit 9d3004bf7b
1 changed files with 5 additions and 1 deletions
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6
include/xen/arm/page.h
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@ -76,7 +76,11 @@ 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_phys(v) >> XEN_PAGE_SHIFT))
#define virt_to_gfn(v) \
({ \
WARN_ON_ONCE(!virt_addr_valid(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. */