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6742eefc93
We haven't yet implemented the fairly involved handshaking that will be needed to migrate PEF protected guests. For now, just use a migration blocker so we get a meaningful error if someone attempts this (this is the same approach used by AMD SEV). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org>
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/*
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* PEF (Protected Execution Facility) for POWER support
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*
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* Copyright Red Hat.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qom/object_interfaces.h"
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#include "sysemu/kvm.h"
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#include "migration/blocker.h"
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#include "exec/confidential-guest-support.h"
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#include "hw/ppc/pef.h"
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#define TYPE_PEF_GUEST "pef-guest"
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OBJECT_DECLARE_SIMPLE_TYPE(PefGuest, PEF_GUEST)
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typedef struct PefGuest PefGuest;
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typedef struct PefGuestClass PefGuestClass;
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struct PefGuestClass {
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ConfidentialGuestSupportClass parent_class;
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};
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/**
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* PefGuest:
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*
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* The PefGuest object is used for creating and managing a PEF
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* guest.
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*
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* # $QEMU \
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* -object pef-guest,id=pef0 \
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* -machine ...,confidential-guest-support=pef0
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*/
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struct PefGuest {
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ConfidentialGuestSupport parent_obj;
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};
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static int kvmppc_svm_init(Error **errp)
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{
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#ifdef CONFIG_KVM
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static Error *pef_mig_blocker;
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if (!kvm_check_extension(kvm_state, KVM_CAP_PPC_SECURE_GUEST)) {
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error_setg(errp,
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"KVM implementation does not support Secure VMs (is an ultravisor running?)");
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return -1;
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} else {
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int ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_PPC_SECURE_GUEST, 0, 1);
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if (ret < 0) {
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error_setg(errp,
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"Error enabling PEF with KVM");
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return -1;
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}
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}
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/* add migration blocker */
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error_setg(&pef_mig_blocker, "PEF: Migration is not implemented");
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/* NB: This can fail if --only-migratable is used */
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migrate_add_blocker(pef_mig_blocker, &error_fatal);
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return 0;
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#else
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g_assert_not_reached();
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#endif
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}
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/*
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* Don't set error if KVM_PPC_SVM_OFF ioctl is invoked on kernels
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* that don't support this ioctl.
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*/
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static int kvmppc_svm_off(Error **errp)
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{
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#ifdef CONFIG_KVM
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int rc;
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rc = kvm_vm_ioctl(KVM_STATE(current_accel()), KVM_PPC_SVM_OFF);
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if (rc && rc != -ENOTTY) {
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error_setg_errno(errp, -rc, "KVM_PPC_SVM_OFF ioctl failed");
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return rc;
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}
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return 0;
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#else
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g_assert_not_reached();
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#endif
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}
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int pef_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
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{
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if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) {
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return 0;
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}
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if (!kvm_enabled()) {
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error_setg(errp, "PEF requires KVM");
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return -1;
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}
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return kvmppc_svm_init(errp);
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}
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int pef_kvm_reset(ConfidentialGuestSupport *cgs, Error **errp)
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{
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if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) {
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return 0;
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}
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/*
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* If we don't have KVM we should never have been able to
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* initialize PEF, so we should never get this far
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*/
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assert(kvm_enabled());
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return kvmppc_svm_off(errp);
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}
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OBJECT_DEFINE_TYPE_WITH_INTERFACES(PefGuest,
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pef_guest,
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PEF_GUEST,
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CONFIDENTIAL_GUEST_SUPPORT,
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{ TYPE_USER_CREATABLE },
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{ NULL })
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static void pef_guest_class_init(ObjectClass *oc, void *data)
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{
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}
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static void pef_guest_init(Object *obj)
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{
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}
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static void pef_guest_finalize(Object *obj)
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{
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}
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