Re: [PATCH v6 14/64] KVM: arm64: nv: Handle SPSR_EL2 specially

Russell King (Oracle)
2022-02-01T16:43:17Z

On Fri, Jan 28, 2022 at 12:18:22PM +0000, Marc Zyngier wrote:
> SPSR_EL2 needs special attention when running nested on ARMv8.3:
>
> If taking an exception while running at vEL2 (actually EL1), the
> HW will update the SPSR_EL1 register with the EL1 mode. We need
> to track this in order to make sure that accesses to the virtual
> view of SPSR_EL2 is correct.
>
> To do so, we place an illegal value in SPSR_EL1.M, and patch it
> accordingly if required when accessing it.
>
> Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

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