Re: [PATCH v8 01/26] arm64: Fix HCR.TGE status for NMI contexts

[Catalin Marinas]

On Tue, Jan 08, 2019 at 02:07:19PM +0000, Julien Thierry wrote:
> When using VHE, the host needs to clear HCR_EL2.TGE bit in order
> to interract with guest TLBs, switching from EL2&0 translation regime
> to EL1&0.
> 
> However, some non-maskable asynchronous event could happen while TGE is
> cleared like SDEI. Because of this address translation operations
> relying on EL2&0 translation regime could fail (tlb invalidation,
> userspace access, ...).

Why would an NMI context need to access user space? (just curious what
breaks exactly without this patch; otherwise it looks fine)

-- 
Catalin