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| author | Simon Leiner <simon@leiner.me> | 2020-08-25 11:31:53 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2020-08-27 08:58:51 +0200 |
| commit | 9d3004bf7ba32c89873bb8422671d52b4bb52ce1 (patch) | |
| tree | 3abe4c81ebdcb3f1b167489e4e3466675814e202 | |
| parent | d742db70033c745e410523e00522ee0cfe2aa416 (diff) | |
| download | linux-stable-9d3004bf7ba32c89873bb8422671d52b4bb52ce1.tar.gz linux-stable-9d3004bf7ba32c89873bb8422671d52b4bb52ce1.tar.bz2 linux-stable-9d3004bf7ba32c89873bb8422671d52b4bb52ce1.zip | |
arm/xen: Add misuse warning to virt_to_gfn
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>
| -rw-r--r-- | include/xen/arm/page.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/xen/arm/page.h b/include/xen/arm/page.h index d7f6af50e200..39df751d0dc4 100644 --- a/include/xen/arm/page.h +++ b/include/xen/arm/page.h @@ -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. */ |