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KVM: s390: mechanism to enable guest zPCI Interpretation

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The guest must have access to certain facilities in order to allow
interpretive execution of zPCI instructions and adapter event
notifications.  However, there are some cases where a guest might
disable interpretation -- provide a mechanism via which we can defer
enabling the associated zPCI interpretation facilities until the guest
indicates it wishes to use them.

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20220606203325.110625-15-mjrosato@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Matthew Rosato 2022-06-06 16:33:18 -04:00 committed by Christian Borntraeger
parent 73f91b0043
commit 3f4bbb4342
3 changed files with 52 additions and 0 deletions
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4
arch/s390/include/asm/kvm_host.h
View File

@ -254,7 +254,10 @@ struct kvm_s390_sie_block {
#define ECB2_IEP 0x20
#define ECB2_PFMFI 0x08
#define ECB2_ESCA 0x04
#define ECB2_ZPCI_LSI 0x02
__u8 ecb2; /* 0x0062 */
#define ECB3_AISI 0x20
#define ECB3_AISII 0x10
#define ECB3_DEA 0x08
#define ECB3_AES 0x04
#define ECB3_RI 0x01
@ -940,6 +943,7 @@ struct kvm_arch{
int use_cmma;
int use_pfmfi;
int use_skf;
int use_zpci_interp;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;

38
arch/s390/kvm/kvm-s390.c
View File

@ -1031,6 +1031,42 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
return 0;
}
static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
{
/* Only set the ECB bits after guest requests zPCI interpretation */
if (!vcpu->kvm->arch.use_zpci_interp)
return;
vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
}
void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
unsigned long i;
lockdep_assert_held(&kvm->lock);
if (!kvm_s390_pci_interp_allowed())
return;
/*
* If host is configured for PCI and the necessary facilities are
* available, turn on interpretation for the life of this guest
*/
kvm->arch.use_zpci_interp = 1;
kvm_s390_vcpu_block_all(kvm);
kvm_for_each_vcpu(i, vcpu, kvm) {
kvm_s390_vcpu_pci_setup(vcpu);
kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
}
kvm_s390_vcpu_unblock_all(kvm);
}
static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
unsigned long cx;
@ -3336,6 +3372,8 @@ static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
kvm_s390_vcpu_crypto_setup(vcpu);
kvm_s390_vcpu_pci_setup(vcpu);
mutex_lock(&vcpu->kvm->lock);
if (kvm_s390_pv_is_protected(vcpu->kvm)) {
rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);

10
arch/s390/kvm/kvm-s390.h
View File

@ -507,6 +507,16 @@ void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
*/
void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
/**
* kvm_s390_vcpu_pci_enable_interp
*
* Set the associated PCI attributes for each vcpu to allow for zPCI Load/Store
* interpretation as well as adapter interruption forwarding.
*
* @kvm: the KVM guest
*/
void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm);
/**
* diag9c_forwarding_hz
*