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KVM: arm64: Re-mask SError after the one instruction window

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KVM consumes any SError that were pending during guest exit with a
dsb/isb and unmasking SError. It currently leaves SError unmasked for
the rest of world-switch.

This means any SError that occurs during this part of world-switch
will cause a hyp-panic. We'd much prefer it to remain pending until
we return to the host.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
James Morse 2019-06-18 16:18:08 +01:00 • committed by Marc Zyngier
commit dad6321ffa
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/hyp/entry.S
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@ -175,6 +175,8 @@ abort_guest_exit_start:
.global abort_guest_exit_end
abort_guest_exit_end:
msr daifset, #4 // Mask aborts
// If the exception took place, restore the EL1 exception
// context so that we can report some information.
// Merge the exception code with the SError pending bit.