Re: [Qemu-devel] [RFC PATCH v2 4/4] spapr: Fix migration of Radix guests

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

On Fri, May 19, 2017 at 11:10:39AM +0530, Bharata B Rao wrote:
> Fix migration of radix guests by ensuring that we issue
> KVM_PPC_CONFIGURE_V3_MMU for radix case post migration.
> 
> Reported-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index daf335c..8f20f14 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1400,6 +1400,18 @@ static int spapr_post_load(void *opaque, int version_id)
>          err = spapr_rtc_import_offset(&spapr->rtc, spapr->rtc_offset);
>      }
> 
> +    if (spapr->patb_entry) {
> +        PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
> +        if (kvmppc_has_cap_mmu_radix() && kvm_enabled()) {
> +            err = kvmppc_configure_v3_mmu(cpu, SPAPR_PROC_TABLE_RADIX,
> +                ((cpu->env.spr[SPR_LPCR] & LPCR_GTSE) ? SPAPR_PROC_TABLE_GTSE :
> +                0), spapr->patb_entry);

Better to use explicit 'true' and 'false' in the above call. Here is
the updated patch:

>From 937c51cac73b4211ef153c1f5940215960383494 Mon Sep 17 00:00:00 2001
From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Date: Tue, 16 May 2017 12:19:54 +0530
Subject: [RFC PATCH v2.1 4/4] spapr: Fix migration of Radix guests

Fix migration of radix guests by ensuring that we issue
KVM_PPC_CONFIGURE_V3_MMU for radix case post migration.

Reported-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index daf335c..69e184b 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1400,6 +1400,18 @@ static int spapr_post_load(void *opaque, int version_id)
         err = spapr_rtc_import_offset(&spapr->rtc, spapr->rtc_offset);
     }
 
+    if (spapr->patb_entry) {
+        PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
+        if (kvmppc_has_cap_mmu_radix() && kvm_enabled()) {
+            err = kvmppc_configure_v3_mmu(cpu, true,
+                ((cpu->env.spr[SPR_LPCR] & LPCR_GTSE) ? true : false),
+                spapr->patb_entry);
+        } else {
+            error_report("Radix guest is unsupported by the host");
+            return -EINVAL;
+        }
+    }
+
     return err;
 }
 
-- 
2.7.4