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    SubjectRe: [PATCH v8 01/26] arm64: Fix HCR.TGE status for NMI contexts
    On Tue, 08 Jan 2019 14:07:19 +0000,
    Julien Thierry <julien.thierry@arm.com> 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, ...).
    >
    > Fix this by properly setting HCR_EL2.TGE when entering NMI context and
    > clear it if necessary when returning to the interrupted context.
    >
    > Signed-off-by: Julien Thierry <julien.thierry@arm.com>
    > Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
    > Cc: Arnd Bergmann <arnd@arndb.de>
    > Cc: Catalin Marinas <catalin.marinas@arm.com>
    > Cc: Will Deacon <will.deacon@arm.com>
    > Cc: Marc Zyngier <marc.zyngier@arm.com>
    > Cc: James Morse <james.morse@arm.com>
    > Cc: linux-arch@vger.kernel.org
    > Cc: stable@vger.kernel.org

    Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

    Thanks,

    M.

    --
    Jazz is not dead, it just smell funny.

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