[PATCH] KVM: arm64: Don't free hyp pages with pKVM on GICv2

[Marc Zyngier]

On Thu, 26 Jun 2025 10:10:14 +0000, Quentin Perret wrote:
> Marc reported that enabling protected mode on a device with GICv2
> doesn't fail gracefully as one would expect, and leads to a host
> kernel crash.
> 
> As it turns out, the first half of pKVM init happens before the vgic
> probe, and so by the time we find out we have a GICv2 we're already
> committed to keeping the pKVM vectors installed at EL2 -- pKVM rejects
> stub HVCs for obvious security reasons. However, the error path on KVM
> init leads to teardown_hyp_mode() which unconditionally frees hypervisor
> allocations (including the EL2 stacks and per-cpu pages) under the
> assumption that a previous cpu_hyp_uninit() execution has reset the
> vectors back to the stubs, which is false with pKVM.
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: Don't free hyp pages with pKVM on GICv2
      commit: 0e02219f9cf4f0c0aa3dbf3c820e6612bf3f0c8c

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.