[PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
From: Marc Zyngier <maz@kernel.org>
Date: 2021-02-08 10:17:32
Also in:
kvmarm, lkml
Subsystem:
documentation, kernel virtual machine (kvm), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Jonathan Corbet, Paolo Bonzini, Marc Zyngier, Oliver Upton, Linus Torvalds
For completeness, let's document the HVC_VHE_RESTART stub. Signed-off-by: Marc Zyngier <maz@kernel.org> Acked-by: David Brazdil <redacted> --- Documentation/virt/kvm/arm/hyp-abi.rst | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst
index 83cadd8186fa..4d43fbc25195 100644
--- a/Documentation/virt/kvm/arm/hyp-abi.rst
+++ b/Documentation/virt/kvm/arm/hyp-abi.rst@@ -58,6 +58,15 @@ these functions (see arch/arm{,64}/include/asm/virt.h): into place (arm64 only), and jump to the restart address while at HYP/EL2. This hypercall is not expected to return to its caller. +* :: + + x0 = HVC_VHE_RESTART (arm64 only) + + Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling + the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU + being off, and VHE not being disabled by any other means (command line + option, for example). + Any other value of r0/x0 triggers a hypervisor-specific handling, which is not documented here.
--
2.29.2
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