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| author | Marc Zyngier <maz@kernel.org> | 2025-05-14 11:35:00 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-05-19 08:01:19 +0100 |
| commit | 29d1697c8c8f64e4d8bb988f957ca1d4980937dc (patch) | |
| tree | c0d6d226212ec630cccd66496f670c298478eaca | |
| parent | a7484c80e5ca1ae0c397bb8003bc588f0dcf43f4 (diff) | |
KVM: arm64: Document NV caps and vcpu flags
Describe the two new vcpu flags that control NV, together with
the capabilities that advertise them.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250514103501.2225951-18-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 47c7c3f92314..fe3d6b5d2acc 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -3460,7 +3460,8 @@ 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. @@ -3527,6 +3528,17 @@ 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 ----------------------------- |