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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/ctl_reg.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/ctl_reg.h')
| -rw-r--r-- | arch/s390/include/asm/ctl_reg.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ctl_reg.h b/arch/s390/include/asm/ctl_reg.h index 04dc65f8901d..c800199a376b 100644 --- a/arch/s390/include/asm/ctl_reg.h +++ b/arch/s390/include/asm/ctl_reg.h @@ -12,6 +12,8 @@ #define CR0_CLOCK_COMPARATOR_SIGN BIT(63 - 10) #define CR0_LOW_ADDRESS_PROTECTION BIT(63 - 35) +#define CR0_FETCH_PROTECTION_OVERRIDE BIT(63 - 38) +#define CR0_STORAGE_PROTECTION_OVERRIDE BIT(63 - 39) #define CR0_EMERGENCY_SIGNAL_SUBMASK BIT(63 - 49) #define CR0_EXTERNAL_CALL_SUBMASK BIT(63 - 50) #define CR0_CLOCK_COMPARATOR_SUBMASK BIT(63 - 52) |