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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-06-26 16:06:39 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2012-07-03 14:55:35 -0300
commit0744426e28490357855aafd2ca76c819231851c5 (patch)
tree6051f189b36552e40e5bceb1453df9b47eb3bc14 /arch/s390
parent7ba26c482fcb42b01785ee1f39871fcc636ab3fe (diff)
downloadlinux-linaro-stable-0744426e28490357855aafd2ca76c819231851c5.tar.gz
KVM: s390: fix sigp set prefix status stored cases
If an invalid parameter is passed or the addressed cpu is in an incorrect state sigp set prefix will store a status. This status must only have bits set as defined by the architecture. The current kvm implementation missed to clear bits and also did not set the intended status bit ("and" instead of "or" operation). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/sigp.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index caccc0ee9cee..ca544d53557e 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -207,6 +207,7 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
address = address & 0x7fffe000u;
if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
+ *reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INVALID_PARAMETER;
return 1; /* invalid parameter */
}
@@ -220,8 +221,9 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
li = fi->local_int[cpu_addr];
if (li == NULL) {
+ *reg &= 0xffffffff00000000UL;
+ *reg |= SIGP_STATUS_INCORRECT_STATE;
rc = 1; /* incorrect state */
- *reg &= SIGP_STATUS_INCORRECT_STATE;
kfree(inti);
goto out_fi;
}
@@ -229,8 +231,9 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
spin_lock_bh(&li->lock);
/* cpu must be in stopped state */
if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
+ *reg &= 0xffffffff00000000UL;
+ *reg |= SIGP_STATUS_INCORRECT_STATE;
rc = 1; /* incorrect state */
- *reg &= SIGP_STATUS_INCORRECT_STATE;
kfree(inti);
goto out_li;
}