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KVM: s390: interface to clear CRYCB masks 

Introduces a new KVM function to clear the APCB0 and APCB1 in the guest's
CRYCB. This effectively clears all bits of the APM, AQM and ADM masks
configured for the guest. The VCPUs are taken out of SIE to ensure the
VCPUs do not get out of sync.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Farhan Ali <alifm@linux.ibm.com>
Tested-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20180925231641.4954-11-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Tony Krowiak 2018-09-25 19:16:25 -04:00 committed by Christian Borntraeger
parent 81b2b4b76a
commit 42104598ef
2 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/kvm_host.h
View File

@ -859,6 +859,8 @@ void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
void kvm_arch_crypto_clear_masks(struct kvm *kvm);
extern int sie64a(struct kvm_s390_sie_block *, u64 *);
extern char sie_exit;

15
arch/s390/kvm/kvm-s390.c
View File

@ -2033,6 +2033,21 @@ static void kvm_s390_set_crycb_format(struct kvm *kvm)
kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}
void kvm_arch_crypto_clear_masks(struct kvm *kvm)
{
mutex_lock(&kvm->lock);
kvm_s390_vcpu_block_all(kvm);
memset(&kvm->arch.crypto.crycb->apcb0, 0,
sizeof(kvm->arch.crypto.crycb->apcb0));
memset(&kvm->arch.crypto.crycb->apcb1, 0,
sizeof(kvm->arch.crypto.crycb->apcb1));
kvm_s390_vcpu_unblock_all(kvm);
mutex_unlock(&kvm->lock);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
static u64 kvm_s390_get_initial_cpuid(void)
{
struct cpuid cpuid;