Re: [PATCH] KVM: arm64: Save/restore sp_el0 as part of __guest_enter

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On Sat, Apr 25, 2020 at 10:43:21AM +0100, Marc Zyngier wrote:
> We currently save/restore sp_el0 in C code. This is a bit unsafe,
> as a lot of the C code expects 'current' to be accessible from
> there (and the opportunity to run kernel code in HYP is specially
> great with VHE).
> 
> Instead, let's move the save/restore of sp_el0 to the assembly
> code (in __guest_enter), making sure that sp_el0 is correct
> very early on when we exit the guest, and is preserved as long
> as possible to its host value when we enter the guest.
> 
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> ---
>  arch/arm64/kvm/hyp/entry.S     | 23 +++++++++++++++++++++++
>  arch/arm64/kvm/hyp/sysreg-sr.c | 17 +++--------------
>  2 files changed, 26 insertions(+), 14 deletions(-)
>

Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>

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