KVM: arm64: Save/restore sp_el0 as part of __guest_enter

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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.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2020-04-24 14:24:34 +01:00

parent 6aea9e0503

commit 6e977984f6

2 changed files with 26 additions and 14 deletions

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23

arch/arm64/kvm/hyp/entry.S

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17

arch/arm64/kvm/hyp/sysreg-sr.c

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