[v1] Misc patches for 2020-09-24

[PULL 82/92] target/i386: Fix VM migration when interrupt based APF is enabled

Paolo Bonzini posted 92 patches 5 years, 4 months ago

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Maintainers: Fam Zheng <fam@euphon.net>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Thomas Huth <thuth@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Markus Armbruster <armbru@redhat.com>, Bandan Das <bsd@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Michael Roth <mdroth@linux.vnet.ibm.com>, Peter Maydell <peter.maydell@linaro.org>, Jason Wang <jasowang@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Sergio Lopez <slp@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Laurent Vivier <lvivier@redhat.com>, Hannes Reinecke <hare@suse.com>, Stefan Weil <sw@weilnetz.de>, Cleber Rosa <crosa@redhat.com>, Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>, David Hildenbrand <david@redhat.com>, Aurelien Jarno <aurelien@aurel32.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Eric Blake <eblake@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Alexander Bulekov <alxndr@bu.edu>, "Michael S. Tsirkin" <mst@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, Max Reitz <mreitz@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Sunil Muthuswamy <sunilmut@microsoft.com>, Richard Henderson <rth@twiddle.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Kevin Wolf <kwolf@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Halil Pasic <pasic@linux.ibm.com>

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[PULL 82/92] target/i386: Fix VM migration when interrupt based APF is enabled

Posted by Paolo Bonzini 5 years, 4 months ago

From: Vitaly Kuznetsov <vkuznets@redhat.com>

VM with  interrupt based APF enabled fails to migrate:
qemu-system-x86_64: error: failed to set MSR 0x4b564d02 to 0xf3

We have two issues:
1) There is a typo in kvm_put_msrs() and we write async_pf_int_msr
to MSR_KVM_ASYNC_PF_EN (instead of MSR_KVM_ASYNC_PF_INT)

2) We restore MSR_KVM_ASYNC_PF_EN before MSR_KVM_ASYNC_PF_INT is set
and this violates the check in KVM.

Re-order MSR_KVM_ASYNC_PF_EN/MSR_KVM_ASYNC_PF_INT setting (and
kvm_get_msrs() for consistency) and fix the typo.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200917102316.814804-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/kvm.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 06c2025c67..b327e8706f 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -2819,12 +2819,12 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
         kvm_msr_entry_add(cpu, MSR_IA32_TSC, env->tsc);
         kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, env->system_time_msr);
         kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
+        if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) {
+            kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_INT, env->async_pf_int_msr);
+        }
         if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) {
             kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, env->async_pf_en_msr);
         }
-        if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) {
-            kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, env->async_pf_int_msr);
-        }
         if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) {
             kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, env->pv_eoi_en_msr);
         }
@@ -3207,12 +3207,12 @@ static int kvm_get_msrs(X86CPU *cpu)
 #endif
     kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, 0);
     kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, 0);
-    if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) {
-        kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, 0);
-    }
     if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) {
         kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_INT, 0);
     }
+    if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) {
+        kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, 0);
+    }
     if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) {
         kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, 0);
     }
-- 
2.26.2