diff options
| author | Claudio Imbrenda | 2023-07-05 13:19:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-08-03 10:23:48 +0200 |
| commit | 017f686bcb536ff23d49c143fdf9d1fd89a9a924 (patch) | |
| tree | c8fb37b755e60ded13babdcbd543fbcfe2be9ac5 | |
| parent | e8df129860665d49bff61a97de55b37c4bd33146 (diff) | |
KVM: s390: pv: fix index value of replaced ASCE
[ Upstream commit c2fceb59bbda16468bda82b002383bff59de89ab ]
The index field of the struct page corresponding to a guest ASCE should
be 0. When replacing the ASCE in s390_replace_asce(), the index of the
new ASCE should also be set to 0.
Having the wrong index might lead to the wrong addresses being passed
around when notifying pte invalidations, and eventually to validity
intercepts (VM crash) if the prefix gets unmapped and the notifier gets
called with the wrong address.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Fixes: faa2f72cb356 ("KVM: s390: pv: leak the topmost page table when destroy fails")
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20230705111937.33472-3-imbrenda@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/s390/mm/gmap.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 02d15c8dc92e..243f673fa651 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2843,6 +2843,7 @@ int s390_replace_asce(struct gmap *gmap) page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER); if (!page) return -ENOMEM; + page->index = 0; table = page_to_virt(page); memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT)); |