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KVM: s390: Fix for running nested uner z/VM

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There are circumstances when running nested under z/VM that would trigger a
 WARN_ON_ONCE. Remove the WARN_ON_ONCE. Long term we certainly want to make this
 code more robust and flexible, but just returning instead of WARNING makes
 guest bootable again.
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Merge tag 'kvm-s390-master-5.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: Fix for running nested uner z/VM

There are circumstances when running nested under z/VM that would trigger a
WARN_ON_ONCE. Remove the WARN_ON_ONCE. Long term we certainly want to make this
code more robust and flexible, but just returning instead of WARNING makes
guest bootable again.
This commit is contained in:
Paolo Bonzini 2020-05-06 08:09:17 -04:00
commit 2673cb6849
1 changed files with 3 additions and 1 deletions
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4
arch/s390/kvm/priv.c
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@ -626,10 +626,12 @@ static int handle_pqap(struct kvm_vcpu *vcpu)
* available for the guest are AQIC and TAPQ with the t bit set
* since we do not set IC.3 (FIII) we currently will only intercept
* the AQIC function code.
* Note: running nested under z/VM can result in intercepts for other
* function codes, e.g. PQAP(QCI). We do not support this and bail out.
*/
reg0 = vcpu->run->s.regs.gprs[0];
fc = (reg0 >> 24) & 0xff;
if (WARN_ON_ONCE(fc != 0x03))
if (fc != 0x03)
return -EOPNOTSUPP;
/* PQAP instruction is allowed for guest kernel only */