55 lines
2.0 KiB
Diff
55 lines
2.0 KiB
Diff
|
From 42405600b468b79523f7e8171c1aac4a3d012792 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Eduardo Habkost <ehabkost@redhat.com>
|
||
|
|
Date: Tue, 21 Aug 2018 19:15:41 +0100
|
||
|
|
Subject: [PATCH 1/2] i386: Disable TOPOEXT by default on "-cpu host"
|
||
|
|
|
||
|
|
RH-Author: Eduardo Habkost <ehabkost@redhat.com>
|
||
|
|
Message-id: <20180821191541.31916-2-ehabkost@redhat.com>
|
||
|
|
Patchwork-id: 81904
|
||
|
|
O-Subject: [qemu-kvm RHEL8/virt212 PATCH v2 1/1] i386: Disable TOPOEXT by default on "-cpu host"
|
||
|
|
Bugzilla: 1619804
|
||
|
|
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||
|
|
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
|
||
|
|
RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
|
||
|
|
|
||
|
|
Enabling TOPOEXT is always allowed, but it can't be enabled
|
||
|
|
blindly by "-cpu host" because it may make guests crash if the
|
||
|
|
rest of the cache topology information isn't provided or isn't
|
||
|
|
consistent.
|
||
|
|
|
||
|
|
This addresses the bug reported at:
|
||
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=1613277
|
||
|
|
|
||
|
|
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
|
||
|
|
Message-Id: <20180809221852.15285-1-ehabkost@redhat.com>
|
||
|
|
Tested-by: Richard W.M. Jones <rjones@redhat.com>
|
||
|
|
Reviewed-by: Babu Moger <babu.moger@amd.com>
|
||
|
|
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
|
||
|
|
(cherry picked from commit 7210a02c58572b2686a3a8d610c6628f87864aed)
|
||
|
|
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
|
||
|
|
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
||
|
|
---
|
||
|
|
target/i386/cpu.c | 6 ++++++
|
||
|
|
1 file changed, 6 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
|
||
|
|
index 605d0fa..e16dba7 100644
|
||
|
|
--- a/target/i386/cpu.c
|
||
|
|
+++ b/target/i386/cpu.c
|
||
|
|
@@ -852,6 +852,12 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
|
||
|
|
},
|
||
|
|
.cpuid_eax = 0x80000001, .cpuid_reg = R_ECX,
|
||
|
|
.tcg_features = TCG_EXT3_FEATURES,
|
||
|
|
+ /*
|
||
|
|
+ * TOPOEXT is always allowed but can't be enabled blindly by
|
||
|
|
+ * "-cpu host", as it requires consistent cache topology info
|
||
|
|
+ * to be provided so it doesn't confuse guests.
|
||
|
|
+ */
|
||
|
|
+ .no_autoenable_flags = CPUID_EXT3_TOPOEXT,
|
||
|
|
},
|
||
|
|
[FEAT_C000_0001_EDX] = {
|
||
|
|
.feat_names = {
|
||
|
|
--
|
||
|
|
1.8.3.1
|
||
|
|
|