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KVM: s390: Fixed CC of SIGP SET_PREFIX handler

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When SIGP SET_PREFIX is called with an illegal CPU id, it must return
the condition code 3 ("not operational") instead of 1. Also fixed the
order in which the checks are done - CC3 has a higher priority than CC1.
And while we're at it, this patch also get rid of the floating interrupt
lock here by using kvm_get_vcpu() to get the local_int struct of the
destination CPU.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Thomas Huth 2014-01-27 12:06:19 +01:00 committed by Christian Borntraeger
parent ff520a6327
commit 13b191ae4a
1 changed files with 8 additions and 16 deletions
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24
arch/s390/kvm/sigp.c
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@ -249,12 +249,18 @@ static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
u64 *reg)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
struct kvm_s390_local_interrupt *li = NULL;
struct kvm_s390_local_interrupt *li;
struct kvm_vcpu *dst_vcpu = NULL;
struct kvm_s390_interrupt_info *inti;
int rc;
u8 tmp;
if (cpu_addr < KVM_MAX_VCPUS)
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
if (!dst_vcpu)
return SIGP_CC_NOT_OPERATIONAL;
li = &dst_vcpu->arch.local_int;
/* make sure that the new value is valid memory */
address = address & 0x7fffe000u;
if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
@ -268,18 +274,6 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
if (!inti)
return SIGP_CC_BUSY;
spin_lock(&fi->lock);
if (cpu_addr < KVM_MAX_VCPUS)
li = fi->local_int[cpu_addr];
if (li == NULL) {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INCORRECT_STATE;
rc = SIGP_CC_STATUS_STORED;
kfree(inti);
goto out_fi;
}
spin_lock_bh(&li->lock);
/* cpu must be in stopped state */
if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
@ -302,8 +296,6 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
out_li:
spin_unlock_bh(&li->lock);
out_fi:
spin_unlock(&fi->lock);
return rc;
}