Re: [PATCH 6.6 v3 0/6] arm64: KVM: Backport VHE-only boot fixes

[Colton Lewis]

Sasha Levin <sashal@xxxxxxxxxx> writes:

> On Thu, Jul 09, 2026 at 10:35:57PM +0000, Colton Lewis wrote:
> > Architectural updates retroactively made FEAT_E2H0 optional, meaning
> > hardware can implement FEAT_VHE without FEAT_E2H0. On such CPUs,
> > HCR_EL2.E2H can reset to an unknown state and must be initialized early
> > so later code can reliably detect whether E2H mode is active.

> > Without these fixes, booting 6.6.y as a guest under KVM nested
> > virtualization will hang at boot.

> Queued the series for 6.6, thanks. I also picked up the follow-up
> "arm64: sysreg: Correct sign definitions for EIESB and DoubleLock"
> on top.

Thank you Sasha