Re: [PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
From: David Brazdil <hidden>
Date: 2021-01-18 13:33:11
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kvmarm, lkml
On Mon, Jan 18, 2021 at 09:45:29AM +0000, Marc Zyngier wrote:
For completeness, let's document the HVC_VHE_RESTART stub. Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <redacted>
quoted hunk ↗ jump to hunk
--- 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..1ba628baf11b 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 mean (comment line option,
'means' (both singular and plural), and 'command line'
+ 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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