OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

KVM: s390: fixes for cmma migration 

Two fixes for potential bitmap overruns in the cmma migration
 code.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.22 (GNU/Linux)
 
 iQIcBAABAgAGBQJaPRe7AAoJEBF7vIC1phx8ENMQAIfuqVSU0zK535O+6sEMSReG
 phfs/EG008n5/r7dURovjjAotlpBhiltcS+aePtMfZOhnZZ0/Sb5Meqc0R+U3KIu
 b4EH9Gdg8oM9dGNaYtvlAwCZCisDnhfugY187UIHn7wDURWA8PDvx4aBrsLTO2JW
 nuhY2he93S3qpB6lXVTIx6yCUB3Q7iBfb+PLzPEfiUlQ+ZFIciddpq0JwCDsEQtx
 wQqYfKDcBClTLvjpk4DNhXW21ssPkN1VUyn0Vqb+Fvz/LFs7O0DhOKngoTqZj65q
 4yJxQXNRDDF5gYqC6akjFloshd/HKdf28VcJ8QLIbV7ozT12KbMhDoVNkvC/WeqV
 URYDmyjimjaa+PlDDEUtgz6Bi9/VJcEtNFGa1sLjIzGuq8J4sLgDTCEDZ7SFQWje
 KKtQzc8cP34apSgSUhNBuPpQrb+1aVtEOBfC7KSy3c2YMuV0Ugdo32AkeZ7ErXv/
 922CvIPYSnNVtasumm84NgukJBwFVJqLAdXMvXKyopFOl/ah8uw+/934nZ35GK6l
 RzHkhzFt+MHuKr0fMAYwI6G/UC8eI98RcMHQiN7tnu0MsYGyL/JtVcjVPd80JdgQ
 wV6yOFHEsaH3rYlC4Z24h+IaGFhVxw9Y7xXTdLUU1XMR20nwyeH1KpVfhKd6hteW
 3JcmtScObUzKUe4YkUGs
 =7RKy
 -----END PGP SIGNATURE-----

Merge tag 'kvm-s390-master-4.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux

KVM: s390: fixes for cmma migration

Two fixes for potential bitmap overruns in the cmma migration
code.
This commit is contained in:
Radim Krčmář 2018-01-06 17:26:37 +01:00
parent 0cb5b30698 c2cf265d86
commit bb4945e60d
2 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/s390/kvm/kvm-s390.c
View File

@ -792,11 +792,12 @@ static int kvm_s390_vm_start_migration(struct kvm *kvm)
if (kvm->arch.use_cmma) {
/*
* Get the last slot. They should be sorted by base_gfn, so the
* last slot is also the one at the end of the address space.
* We have verified above that at least one slot is present.
* Get the first slot. They are reverse sorted by base_gfn, so
* the first slot is also the one at the end of the address
* space. We have verified above that at least one slot is
* present.
*/
ms = slots->memslots + slots->used_slots - 1;
ms = slots->memslots;
/* round up so we only use full longs */
ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
/* allocate enough bytes to store all the bits */

2
arch/s390/kvm/priv.c
View File

@ -1006,7 +1006,7 @@ static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
cbrlo[entries] = gfn << PAGE_SHIFT;
}
if (orc) {
if (orc && gfn < ms->bitmap_size) {
/* increment only if we are really flipping the bit to 1 */
if (!test_and_set_bit(gfn, ms->pgste_bitmap))
atomic64_inc(&ms->dirty_pages);