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ppc/spapr: KVM FWNMI should not be enabled until guest requests it

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The KVM FWNMI capability should be enabled with the "ibm,nmi-register"
rtas call. Although MCEs from KVM will be delivered as architected
interrupts to the guest before "ibm,nmi-register" is called, KVM has
different behaviour depending on whether the guest has enabled FWNMI
(it attempts to do more recovery on behalf of a non-FWNMI guest).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20200325142906.221248-2-npiggin@gmail.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nicholas Piggin 2020-03-26 00:29:03 +10:00 • committed by David Gibson
parent 79178edd2a
commit ec010c0066
4 changed files with 24 additions and 3 deletions
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7
hw/ppc/spapr_caps.c
View file

@ -517,9 +517,10 @@ static void cap_fwnmi_apply(SpaprMachineState *spapr, uint8_t val,
}
if (kvm_enabled()) {
if (kvmppc_set_fwnmi() < 0) {
error_setg(errp, "Firmware Assisted Non-Maskable Interrupts(FWNMI) "
"not supported by KVM");
if (!kvmppc_get_fwnmi()) {
error_setg(errp,
"Firmware Assisted Non-Maskable Interrupts(FWNMI) not supported by KVM.");
error_append_hint(errp, "Try appending -machine cap-fwnmi=off\n");
}
}
}