From: Heiko Carstens <[email protected]> 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 <[email protected]> Signed-off-by: Cornelia Huck <[email protected]> --- arch/s390/kvm/sigp.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index caccc0e..ca544d5 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; } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
