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KVM: SEV: Lock all vCPUs for the duration of SEV-ES VMSA synchronization

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Lock and unlock all vCPUs in a single batch when synchronizing SEV-ES VMSAs
during launch finish, partly to dedup the code by a tiny amount, but mostly
so that sev_launch_update_vmsa() uses the same logic/flow as all other SEV
ioctls that lock all vCPUs.

Link: https://patch.msgid.link/20260310234829.2608037-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-03-10 16:48:14 -07:00
parent cb923ee6a8
commit 8075360f3b
1 changed files with 7 additions and 8 deletions
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15
arch/x86/kvm/svm/sev.c
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@ -1037,19 +1037,18 @@ static int sev_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (kvm_is_vcpu_creation_in_progress(kvm))
return -EBUSY;
ret = kvm_lock_all_vcpus(kvm);
if (ret)
return ret;
kvm_for_each_vcpu(i, vcpu, kvm) {
ret = mutex_lock_killable(&vcpu->mutex);
if (ret)
return ret;
ret = __sev_launch_update_vmsa(kvm, vcpu, &argp->error);
mutex_unlock(&vcpu->mutex);
if (ret)
return ret;
break;
}
return 0;
kvm_unlock_all_vcpus(kvm);
return ret;
}
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)