Re: [PATCH] KVM: arm64: nvhe: Save the SPE context early

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On Tue, 16 Mar 2021 18:33:53 +0000,
Suzuki K Poulose <suzuki.poulose@xxxxxxx> wrote:
> 
> commit b96b0c5de685df82019e16826a282d53d86d112c upstream
> 
> The nVHE KVM hyp drains and disables the SPE buffer, before
> entering the guest, as the EL1&0 translation regime
> is going to be loaded with that of the guest.
> 
> But this operation is performed way too late, because :
>  - The owning translation regime of the SPE buffer
>    is transferred to EL2. (MDCR_EL2_E2PB == 0)
>  - The guest Stage1 is loaded.
> 
> Thus the flush could use the host EL1 virtual address,
> but use the EL2 translations instead of host EL1, for writing
> out any cached data.
> 
> Fix this by moving the SPE buffer handling early enough.
> The restore path is doing the right thing.
> 
> Cc: stable@xxxxxxxxxxxxxxx # v5.4-
> Cc: Christoffer Dall <christoffer.dall@xxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Alexandru Elisei <alexandru.elisei@xxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>

Acked-by: Marc Zyngier <maz@xxxxxxxxxx>

Thanks,

	M.

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



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