[RFC,18/37] KVM: s390: protvirt: Handle spec exception loops
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Message ID 20191024114059.102802-19-frankja@linux.ibm.com
State New
Headers show
Series
  • KVM: s390: Add support for protected VMs
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Commit Message

Janosch Frank Oct. 24, 2019, 11:40 a.m. UTC
SIE intercept code 8 is used only on exception loops for protected
guests. That means we need stop the guest when we see it.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/intercept.c | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Thomas Huth Nov. 14, 2019, 2:22 p.m. UTC | #1
On 24/10/2019 13.40, Janosch Frank wrote:
> SIE intercept code 8 is used only on exception loops for protected
> guests. That means we need stop the guest when we see it.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  arch/s390/kvm/intercept.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
> index acc1710fc472..b013a9c88d43 100644
> --- a/arch/s390/kvm/intercept.c
> +++ b/arch/s390/kvm/intercept.c
> @@ -231,6 +231,13 @@ static int handle_prog(struct kvm_vcpu *vcpu)
>  
>  	vcpu->stat.exit_program_interruption++;
>  
> +	/*
> +	 * Intercept 8 indicates a loop of specification exceptions
> +	 * for protected guests
> +	 */
> +	if (kvm_s390_pv_is_protected(vcpu->kvm))
> +		return -EOPNOTSUPP;
> +
>  	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
>  		rc = kvm_s390_handle_per_event(vcpu);
>  		if (rc)

Reviewed-by: Thomas Huth <thuth@redhat.com>

Patch
diff mbox series

diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index acc1710fc472..b013a9c88d43 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -231,6 +231,13 @@  static int handle_prog(struct kvm_vcpu *vcpu)
 
 	vcpu->stat.exit_program_interruption++;
 
+	/*
+	 * Intercept 8 indicates a loop of specification exceptions
+	 * for protected guests
+	 */
+	if (kvm_s390_pv_is_protected(vcpu->kvm))
+		return -EOPNOTSUPP;
+
 	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
 		rc = kvm_s390_handle_per_event(vcpu);
 		if (rc)