| Message ID | 20200316142613.121089-9-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | FWNMI fixes / changes | expand |
On Tue, Mar 17, 2020 at 12:26:13AM +1000, Nicholas Piggin wrote: > Linux kernels call "ibm,nmi-interlock" in their system reset handlers > contrary to PAPR. Returning an error because the CPU does not hold the > interlock here causes Linux to print warning messages. PowerVM returns > success in this case, so do the same for now. > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Applied, thanks. > --- > hw/ppc/spapr_rtas.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c > index 521e6b0b72..9fb8c8632a 100644 > --- a/hw/ppc/spapr_rtas.c > +++ b/hw/ppc/spapr_rtas.c > @@ -461,8 +461,18 @@ static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, > } > > if (spapr->fwnmi_machine_check_interlock != cpu->vcpu_id) { > - /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */ > - rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); > + /* > + * The vCPU that hit the NMI should invoke "ibm,nmi-interlock" > + * This should be PARAM_ERROR, but Linux calls "ibm,nmi-interlock" > + * for system reset interrupts, despite them not being interlocked. > + * PowerVM silently ignores this and returns success here. Returning > + * failure causes Linux to print the error "FWNMI: nmi-interlock > + * failed: -3", although no other apparent ill effects, this is a > + * regression for the user when enabling FWNMI. So for now, match > + * PowerVM. When most Linux clients are fixed, this could be > + * changed. > + */ > + rtas_st(rets, 0, RTAS_OUT_SUCCESS); > return; > } >
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 521e6b0b72..9fb8c8632a 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -461,8 +461,18 @@ static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, } if (spapr->fwnmi_machine_check_interlock != cpu->vcpu_id) { - /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */ - rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + /* + * The vCPU that hit the NMI should invoke "ibm,nmi-interlock" + * This should be PARAM_ERROR, but Linux calls "ibm,nmi-interlock" + * for system reset interrupts, despite them not being interlocked. + * PowerVM silently ignores this and returns success here. Returning + * failure causes Linux to print the error "FWNMI: nmi-interlock + * failed: -3", although no other apparent ill effects, this is a + * regression for the user when enabling FWNMI. So for now, match + * PowerVM. When most Linux clients are fixed, this could be + * changed. + */ + rtas_st(rets, 0, RTAS_OUT_SUCCESS); return; }
Linux kernels call "ibm,nmi-interlock" in their system reset handlers contrary to PAPR. Returning an error because the CPU does not hold the interlock here causes Linux to print warning messages. PowerVM returns success in this case, so do the same for now. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- hw/ppc/spapr_rtas.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)