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KVM: s390: gaccess: fix real-space designation asce handling for gmap shadows 

For real-space designation asces the asce origin part is only a token.
The asce token origin must not be used to generate an effective
address for storage references. This however is erroneously done
within kvm_s390_shadow_tables().

Furthermore within the same function the wrong parts of virtual
addresses are used to generate a corresponding real address
(e.g. the region second index is used as region first index).

Both of the above can result in incorrect address translations. Only
for real space designations with a token origin of zero and addresses
below one megabyte the translation was correct.

Furthermore replace a "!asce.r" statement with a "!*fake" statement to
make it more obvious that a specific condition has nothing to do with
the architecture, but with the fake handling of real space designations.

Fixes: 3218f7094b ("s390/mm: support real-space for gmap shadows")
Cc: David Hildenbrand <david@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Heiko Carstens 2017-06-19 08:02:28 +02:00 committed by Christian Borntraeger
parent 1ba15b24f0
commit addb63c18a
1 changed files with 6 additions and 9 deletions
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15
arch/s390/kvm/gaccess.c
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@ -977,11 +977,12 @@ static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,
ptr = asce.origin * 4096;
if (asce.r) {
*fake = 1;
ptr = 0;
asce.dt = ASCE_TYPE_REGION1;
}
switch (asce.dt) {
case ASCE_TYPE_REGION1:
if (vaddr.rfx01 > asce.tl && !asce.r)
if (vaddr.rfx01 > asce.tl && !*fake)
return PGM_REGION_FIRST_TRANS;
break;
case ASCE_TYPE_REGION2:
@ -1009,8 +1010,7 @@ static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,
union region1_table_entry rfte;
if (*fake) {
/* offset in 16EB guest memory block */
ptr = ptr + ((unsigned long) vaddr.rsx << 53UL);
ptr += (unsigned long) vaddr.rfx << 53;
rfte.val = ptr;
goto shadow_r2t;
}
@ -1036,8 +1036,7 @@ shadow_r2t:
union region2_table_entry rste;
if (*fake) {
/* offset in 8PB guest memory block */
ptr = ptr + ((unsigned long) vaddr.rtx << 42UL);
ptr += (unsigned long) vaddr.rsx << 42;
rste.val = ptr;
goto shadow_r3t;
}
@ -1064,8 +1063,7 @@ shadow_r3t:
union region3_table_entry rtte;
if (*fake) {
/* offset in 4TB guest memory block */
ptr = ptr + ((unsigned long) vaddr.sx << 31UL);
ptr += (unsigned long) vaddr.rtx << 31;
rtte.val = ptr;
goto shadow_sgt;
}
@ -1101,8 +1099,7 @@ shadow_sgt:
union segment_table_entry ste;
if (*fake) {
/* offset in 2G guest memory block */
ptr = ptr + ((unsigned long) vaddr.sx << 20UL);
ptr += (unsigned long) vaddr.sx << 20;
ste.val = ptr;
goto shadow_pgt;
}