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[Qemu-devel] [PULL 08/17] ppc: define a default LPCR value


From: David Gibson
Subject: [Qemu-devel] [PULL 08/17] ppc: define a default LPCR value
Date: Thu, 23 Jun 2016 15:48:37 +1000

From: Benjamin Herrenschmidt <address@hidden>

This allows us to set the appropriate LPCR bits which will be used
when fixing the exception model for the HV mode.

Signed-off-by: Benjamin Herrenschmidt <address@hidden>
Reviewed-by: David Gibson <address@hidden>
[clg: previous commit 26a7f1291bb5 did not include the LPCR setting as
      it was not needed at the time, adapted commit log ]
Signed-off-by: C├ędric Le Goater <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
 target-ppc/translate_init.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index c847a3e..db56a39 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8518,6 +8518,7 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data)
 void cpu_ppc_set_papr(PowerPCCPU *cpu)
 {
     CPUPPCState *env = &cpu->env;
+    ppc_spr_t *lpcr = &env->spr_cb[SPR_LPCR];
     ppc_spr_t *amor = &env->spr_cb[SPR_AMOR];
 
     /* PAPR always has exception vectors in RAM not ROM. To ensure this,
@@ -8527,6 +8528,19 @@ void cpu_ppc_set_papr(PowerPCCPU *cpu)
      */
     env->msr_mask &= ~((1ull << MSR_EP) | MSR_HVB);
 
+    /* Set emulated LPCR to not send interrupts to hypervisor. Note that
+     * under KVM, the actual HW LPCR will be set differently by KVM itself,
+     * the settings below ensure proper operations with TCG in absence of
+     * a real hypervisor
+     */
+    lpcr->default_value &= ~(LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_KBV);
+    lpcr->default_value |= LPCR_LPES0 | LPCR_LPES1;
+
+    /* We should be followed by a CPU reset but update the active value
+     * just in case...
+     */
+    env->spr[SPR_LPCR] = lpcr->default_value;
+
     /* Set a full AMOR so guest can use the AMR as it sees fit */
     env->spr[SPR_AMOR] = amor->default_value = 0xffffffffffffffffull;
 
-- 
2.5.5




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