diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-09-06 14:02:07 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-08 12:53:00 +0200 |
| commit | 395ea79ebe55d6b01bb8f67bfad0550e6b7cd6d6 (patch) | |
| tree | 15317f37c5950ba481dfa1f46192babc8619740f /arch/arm64/kvm/hyp/switch.c | |
| parent | ddb3d07cfe90ce58c342cf97ce6ce53ba7d10973 (diff) | |
arm64: KVM: Handle async aborts delivered while at EL2
If EL1 generates an asynchronous abort and then traps into EL2
before the abort has been delivered, we may end-up with the
abort firing at the worse possible place: on the host.
In order to avoid this, it is necessary to take the abort at EL2,
by clearing the PSTATE.A bit. In order to survive this abort,
we do it at a point where we're in a known state with respect
to the world switch, and handle the resulting exception,
overloading the exit code in the process.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64/kvm/hyp/switch.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/switch.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 8246de27ace1..8b81cc6f3717 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -292,6 +292,12 @@ again: exit_code = __guest_enter(vcpu, host_ctxt); /* And we're baaack! */ + /* + * We're using the raw exception code in order to only process + * the trap if no SError is pending. We will come back to the + * same PC once the SError has been injected, and replay the + * trapping instruction. + */ if (exit_code == ARM_EXCEPTION_TRAP && !__populate_fault_info(vcpu)) goto again; |