bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 06:44:00 -04:00
Code Issues Packages Projects Releases Wiki Activity

KVM: s390: Honor storage keys when accessing guest memory

Browse Source 
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>
This commit is contained in:
Janis Schoetterl-Glausch
2022-02-11 19:22:07 +01:00
committed by Christian Borntraeger
parent 1a82f6ab23
commit e613d83454
6 changed files with 254 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/page.h
View File

@@ -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