From 1f43571604da85c62f25f3ba6d275b1b5ea76ca2 Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Mon, 5 Jun 2017 12:19:27 -0300
Subject: pc: Use "min-[x]level" on compat_props

Since the automatic cpuid-level code was introduced in commit
c39c0edf9bb3b968ba95484465a50c7b19f4aa3a ("target-i386: Automatically
set level/xlevel/xlevel2 when needed"), the CPU model tables just define
the default CPUID level code (set using "min-level").  Setting
"[x]level" forces CPUID level to a specific value and disable the
automatic-level logic.

But the PC compat code was not updated and the existing "[x]level"
compat properties broke compatibility for people using features that
triggered the auto-level code.  To keep previous behavior, we should set
"min-[x]level" instead of "[x]level" on compat_props.

This was not a problem for most cases, because old machine-types don't
have full-cpuid-auto-level enabled.  The only common use case it broke
was the CPUID[7] auto-level code, that was already enabled since the
first CPUID[7] feature was introduced (in QEMU 1.4.0).

This causes the regression reported at:
https://bugzilla.redhat.com/show_bug.cgi?id=1454641

Change the PC compat code to use "min-[x]level" instead of "[x]level" on
compat_props, and add new test cases to ensure we don't break this
again.

Reported-by: "Guo, Zhiyi" <zhguo@redhat.com>
Fixes: c39c0edf9bb ("target-i386: Automatically set level/xlevel/xlevel2 when needed")
Cc: qemu-stable@nongnu.org
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/hw/i386/pc.h | 42 +++++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

(limited to 'include/hw')

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index e447f5d..d071c9c 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -566,75 +566,75 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .value    = "off",\
     },{\
         .driver   = "qemu64" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(4),\
     },{\
         .driver   = "kvm64" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(5),\
     },{\
         .driver   = "pentium3" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(2),\
     },{\
         .driver   = "n270" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(5),\
     },{\
         .driver   = "Conroe" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(4),\
     },{\
         .driver   = "Penryn" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(4),\
     },{\
         .driver   = "Nehalem" "-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(4),\
     },{\
         .driver   = "n270" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Penryn" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Conroe" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Nehalem" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Westmere" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "SandyBridge" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "IvyBridge" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Haswell" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Haswell-noTSX" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Broadwell" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver   = "Broadwell-noTSX" "-" TYPE_X86_CPU,\
-        .property = "xlevel",\
+        .property = "min-xlevel",\
         .value    = stringify(0x8000000a),\
     },{\
         .driver = TYPE_X86_CPU,\
@@ -860,7 +860,7 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .value    = stringify(2),\
     },{\
         .driver   = "Conroe-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(2),\
     },{\
         .driver   = "Penryn-" TYPE_X86_CPU,\
@@ -868,7 +868,7 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .value    = stringify(2),\
     },{\
         .driver   = "Penryn-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(2),\
     },{\
         .driver   = "Nehalem-" TYPE_X86_CPU,\
@@ -876,7 +876,7 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .value    = stringify(2),\
     },{\
         .driver   = "Nehalem-" TYPE_X86_CPU,\
-        .property = "level",\
+        .property = "min-level",\
         .value    = stringify(2),\
     },{\
         .driver   = "virtio-net-pci",\
-- 
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