Commit 13b191ae authored by Thomas Huth's avatar Thomas Huth Committed by Christian Borntraeger
Browse files

KVM: s390: Fixed CC of SIGP SET_PREFIX handler 



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: default avatarThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent ff520a63

arch/s390/kvm/sigp.c

+8 −16
Original line number Diff line number Diff line
@@ -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;

}

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