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| author |   Janis Schoetterl-Glausch <scgl@linux.ibm.com> | 2022-02-11 19:22:07 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@linux.ibm.com> | 2022-02-14 16:12:57 +0100 |
| commit | e613d83454d7da1c37d78edb278db9c20afb21a2 (patch) | |
| tree | 4663749ab29ab83935804622a3b960f1a8b6ee48 /arch/s390/include/asm/page.h | |
| parent | s390/uaccess: Add copy_from/to_user_key functions (diff) | |
| download | linux-dev-e613d83454d7da1c37d78edb278db9c20afb21a2.tar.xz linux-dev-e613d83454d7da1c37d78edb278db9c20afb21a2.zip | |
KVM: s390: Honor storage keys when accessing guest memory
Storage key checking had not been implemented for instructions emulated
by KVM. Implement it by enhancing the functions used for guest access,
in particular those making use of access_guest which has been renamed
to access_guest_with_key.
Accesses via access_guest_real should not be key checked.
For actual accesses, key checking is done by
copy_from/to_user_key (which internally uses MVCOS/MVCP/MVCS).
In cases where accessibility is checked without an actual access,
this is performed by getting the storage key and checking if the access
key matches. In both cases, if applicable, storage and fetch protection
override are honored.
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20220211182215.2730017-3-scgl@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/page.h')
| -rw-r--r-- | arch/s390/include/asm/page.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index d98d17a36c7b..cfc4d6fb2385 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -20,6 +20,8 @@ #define PAGE_SIZE _PAGE_SIZE #define PAGE_MASK _PAGE_MASK #define PAGE_DEFAULT_ACC 0 +/* storage-protection override */ +#define PAGE_SPO_ACC 9 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) #define HPAGE_SHIFT 20 |