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KVM: arm64: vhe: Drop extra isb() on guest exit

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__kvm_vcpu_run_vhe() end on VHE with an isb(). However, this
function is only reachable via kvm_call_hyp_ret(), which already
contains an isb() in order to mimick the behaviour of nVHE and
provide a context synchronisation event.

We thus have two isb()s back to back, which is one too many.
Drop the first one and solely rely on the one in the helper.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2023-04-08 17:04:27 +01:00
parent 1ff2755d68
commit bcf3e7da3a
1 changed files with 3 additions and 4 deletions
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7
arch/arm64/kvm/hyp/vhe/switch.c
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@ -227,11 +227,10 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
/*
* When we exit from the guest we change a number of CPU configuration
* parameters, such as traps. Make sure these changes take effect
* before running the host or additional guests.
* parameters, such as traps. We rely on the isb() in kvm_call_hyp*()
* to make sure these changes take effect before running the host or
* additional guests.
*/
isb();
return ret;
}