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[PATCH v4 05/12] spapr, ppc: Remove VPM0/RMLS hacks for POWER9


From: David Gibson
Subject: [PATCH v4 05/12] spapr, ppc: Remove VPM0/RMLS hacks for POWER9
Date: Wed, 19 Feb 2020 13:14:02 +1100

For the "pseries" machine, we use "virtual hypervisor" mode where we
only model the CPU in non-hypervisor privileged mode.  This means that
we need guest physical addresses within the modelled cpu to be treated
as absolute physical addresses.

We used to do that by clearing LPCR[VPM0] and setting LPCR[RMLS] to a high
limit so that the old offset based translation for guest mode applied,
which does what we need.  However, POWER9 has removed support for that
translation mode, which meant we had some ugly hacks to keep it working.

We now explicitly handle this sort of translation for virtual hypervisor
mode, so the hacks aren't necessary.  We don't need to set VPM0 and RMLS
from the machine type code - they're now ignored in vhyp mode.  On the cpu
side we don't need to allow LPCR[RMLS] to be set on POWER9 in vhyp mode -
that was only there to allow the hack on the machine side.

Signed-off-by: David Gibson <address@hidden>
Reviewed-by: C├ędric Le Goater <address@hidden>
---
 hw/ppc/spapr_cpu_core.c | 6 +-----
 target/ppc/mmu-hash64.c | 8 --------
 2 files changed, 1 insertion(+), 13 deletions(-)

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index d09125d9af..ea5e11f1d9 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -58,14 +58,10 @@ static void spapr_reset_vcpu(PowerPCCPU *cpu)
      * we don't get spurious wakups before an RTAS start-cpu call.
      * For the same reason, set PSSCR_EC.
      */
-    lpcr &= ~(LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_KBV | pcc->lpcr_pm);
+    lpcr &= ~(LPCR_VPM1 | LPCR_ISL | LPCR_KBV | pcc->lpcr_pm);
     lpcr |= LPCR_LPES0 | LPCR_LPES1;
     env->spr[SPR_PSSCR] |= PSSCR_EC;
 
-    /* Set RMLS to the max (ie, 16G) */
-    lpcr &= ~LPCR_RMLS;
-    lpcr |= 1ull << LPCR_RMLS_SHIFT;
-
     ppc_store_lpcr(cpu, lpcr);
 
     /* Set a full AMOR so guest can use the AMR as it sees fit */
diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
index 6b3c214879..2d54f065d9 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -1126,14 +1126,6 @@ void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
                       (LPCR_PECE_L_MASK & (LPCR_PDEE | LPCR_HDEE | LPCR_EEE |
                       LPCR_DEE | LPCR_OEE)) | LPCR_MER | LPCR_GTSE | LPCR_TC |
                       LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | LPCR_HDICE);
-        /*
-         * If we have a virtual hypervisor, we need to bring back RMLS. It
-         * doesn't exist on an actual P9 but that's all we know how to
-         * configure with softmmu at the moment
-         */
-        if (cpu->vhyp) {
-            lpcr |= (val & LPCR_RMLS);
-        }
         break;
     default:
         g_assert_not_reached();
-- 
2.24.1




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