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KVM: s390: fix shadow table handling for nested guests

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Some odd-ball cases (real-space designation ASCEs) are handled wrong
 for the shadow page tables. Fix it.
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Merge tag 'kvm-s390-master-4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux

KVM: s390: fix shadow table handling for nested guests

Some odd-ball cases (real-space designation ASCEs) are handled wrong
for the shadow page tables. Fix it.
This commit is contained in:
Radim Krčmář 2017-06-22 16:13:06 +02:00
commit d6aa07c169
1 changed files with 6 additions and 9 deletions
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15
arch/s390/kvm/gaccess.c
View File

@ -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;
}