Re: [PATCH v2 16/17] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
From: Jing Zhang <hidden>
Date: 2021-01-05 23:00:13
Also in:
kvmarm
On Mon, Jan 4, 2021 at 8:20 AM Marc Zyngier [off-list ref] wrote:
quoted hunk ↗ jump to hunk
For completeness, let's document the HVC_VHE_RESTART stub. Signed-off-by: Marc Zyngier <maz@kernel.org> --- 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..3961c529769b 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 conditionned by the CPU supporting VHE, the EL2 MMU
Typo: conditionned -> conditioned
+ being off, and VHE not being disabled by any other mean (comment line option, + for example). + Any other value of r0/x0 triggers a hypervisor-specific handling, which is not documented here. -- 2.29.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
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