[PATCH] arm64: KVM: VHE: Clear HCR_TGE when invalidating guest TLBs

Christoffer Dall cdall at linaro.org
Thu Mar 2 04:59:17 PST 2017

On Mon, Feb 27, 2017 at 03:24:37PM +0000, Marc Zyngier wrote:
> When invalidating guest TLBs, special care must be taken to
> actually shoot the guest TLBs and not the host ones if we're
> running on a VHE system.  This is controlled by the HCR_EL2.TGE
> bit, which we forget to clear before invalidating TLBs.
> Address the issue by introducing two wrappers (__tlb_switch_to_guest
> and __tlb_switch_to_host) that take care of both the VTTBR_EL2
> and HCR_EL2.TGE switching.
> Reported-by: Tomasz Nowicki <tnowicki at caviumnetworks.com>
> Tested-by: Tomasz Nowicki <tnowicki at caviumnetworks.com>
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>

Reviewed-by: Christoffer Dall <cdall at linaro.org>

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