Describe the two new vcpu flags that control NV, together with the capabilities that advertise them. Reviewed-by: Oliver Upton <oliver.upton@xxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> --- Documentation/virt/kvm/api.rst | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 2b52eb77e29cb..2d7b516ae408d 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -3456,7 +3456,8 @@ The initial values are defined as: - FPSIMD/NEON registers: set to 0 - SVE registers: set to 0 - System registers: Reset to their architecturally defined - values as for a warm reset to EL1 (resp. SVC) + values as for a warm reset to EL1 (resp. SVC) or EL2 (in the + case of EL2 being enabled). Note that because some registers reflect machine topology, all vcpus should be created before this ioctl is invoked. @@ -3523,6 +3524,17 @@ Possible features: - the KVM_REG_ARM64_SVE_VLS pseudo-register is immutable, and can no longer be written using KVM_SET_ONE_REG. + - KVM_ARM_VCPU_HAS_EL2: Enable Nested Virtualisation support, + booting the guest from EL2 instead of EL1. + Depends on KVM_CAP_ARM_EL2. + The VM is running with HCR_EL2.E2H being RES1 (VHE) unless + KVM_ARM_VCPU_HAS_EL2_E2H0 is also set. + + - KVM_ARM_VCPU_HAS_EL2_E2H0: Restrict Nested Virtualisation + support to HCR_EL2.E2H being RES0 (non-VHE). + Depends on KVM_CAP_ARM_EL2_E2H0. + KVM_ARM_VCPU_HAS_EL2 must also be set. + 4.83 KVM_ARM_PREFERRED_TARGET ----------------------------- -- 2.39.2
