[v3] ppc/pnv: Better big-core model, lpar-per-core, PC unit

[PATCH v3 12/19] ppc/pnv: Implement big-core PVR for Power9/10

Nicholas Piggin posted 19 patches 3 months ago

Diff against v1 v1 v2
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Maintainers: "Cédric Le Goater" <clg@kaod.org>, Nicholas Piggin <npiggin@gmail.com>, "Frédéric Barrat" <fbarrat@linux.ibm.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Yanan Wang <wangyanan55@huawei.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>

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[PATCH v3 12/19] ppc/pnv: Implement big-core PVR for Power9/10

Posted by Nicholas Piggin 3 months ago

Power9/10 CPUs have PVR[51] set in small-core mode and clear in big-core
mode. This is used by skiboot firmware.

PVR is not hypervisor-privileged but it is not so important that spapr
to implement this because it's generally masked out of PVR matching code
in kernels, and only used by firmware.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 hw/ppc/pnv_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
index 6dc05534d7..43cfeaa2d4 100644
--- a/hw/ppc/pnv_core.c
+++ b/hw/ppc/pnv_core.c
@@ -58,6 +58,10 @@ static void pnv_core_cpu_reset(PnvCore *pc, PowerPCCPU *cpu)
     env->nip = 0x10;
     env->msr |= MSR_HVB; /* Hypervisor mode */
     env->spr[SPR_HRMOR] = pc->hrmor;
+    if (pc->big_core) {
+        /* Clear "small core" bit on Power9/10 (this is set in default PVR) */
+        env->spr[SPR_PVR] &= ~PPC_BIT(51);
+    }
     hreg_compute_hflags(env);
     ppc_maybe_interrupt(env);
 
-- 
2.45.1