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Commit: 616d561485a77fbbf8834232a6d3aa9123890820
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From 498389f6b88547c352add4b209d61896a5143c00 Mon Sep 17 00:00:00 2001
Message-Id: <498389f6b88547c352add4b209d61896a5143c00@dist-git>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Fri, 27 Mar 2015 12:48:40 +0100
Subject: [PATCH] RHEL: Hack around changed Broadwell/Haswell CPUs

RHEL-only

Upstream tried to solve the change of Broadwell and Haswell CPUs by
removing rtm and hle features from the corresponding CPU models for new
machine types. Then they reverted this and introduced new *-noTSX models
instead. However, the original fix was backported to RHEL.

This patch makes sure Broadwell and Haswell will always contain rtm and
hle features regardless on RHEL version or machine type used.

https://bugzilla.redhat.com/show_bug.cgi?id=1199446

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_command.c                       | 29 +++++++++++++++++++
 tests/qemuxml2argvdata/cpu-Haswell.args       |  2 +-
 .../qemuxml2argvdata/cpu-host-model-cmt.args  |  3 +-
 tests/qemuxml2argvdata/cpu-tsc-frequency.args |  2 +-
 tests/qemuxml2argvdata/q35-acpi-nouefi.args   |  2 +-
 tests/qemuxml2argvdata/q35-acpi-uefi.args     |  2 +-
 tests/qemuxml2argvdata/q35-noacpi-nouefi.args |  2 +-
 7 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 4fc3176ad3..c1eefca639 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6677,6 +6677,8 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
     size_t i;
     virCapsPtr caps = NULL;
     virCPUDefPtr cpu = def->cpu;
+    bool hle = false;
+    bool rtm = false;
 
     if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
         goto cleanup;
@@ -6734,6 +6736,11 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
         virBufferAsprintf(buf, ",vendor=%s", cpu->vendor_id);
 
     for (i = 0; i < cpu->nfeatures; i++) {
+        if (STREQ("rtm", cpu->features[i].name))
+            rtm = true;
+        if (STREQ("hle", cpu->features[i].name))
+            hle = true;
+
         switch ((virCPUFeaturePolicy) cpu->features[i].policy) {
         case VIR_CPU_FEATURE_FORCE:
         case VIR_CPU_FEATURE_REQUIRE:
@@ -6757,6 +6764,28 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
         }
     }
 
+    /* Some versions of qemu-kvm in RHEL provide Broadwell and Haswell CPU
+     * models which lack rtm and hle features when used with some machine
+     * types. Let's make sure Broadwell and Haswell will always have these
+     * features. But only if the features were not explicitly mentioned in
+     * the guest CPU definition.
+     */
+    if (STREQ_NULLABLE(cpu->model, "Broadwell") ||
+        STREQ_NULLABLE(cpu->model, "Haswell")) {
+        if (!rtm) {
+            if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION))
+                virBufferAddLit(buf, ",rtm=on");
+            else
+                virBufferAddLit(buf, ",+rtm");
+        }
+        if (!hle) {
+            if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION))
+                virBufferAddLit(buf, ",hle=on");
+            else
+                virBufferAddLit(buf, ",+hle");
+        }
+    }
+
     ret = 0;
  cleanup:
     virObjectUnref(caps);
diff --git a/tests/qemuxml2argvdata/cpu-Haswell.args b/tests/qemuxml2argvdata/cpu-Haswell.args
index c7ce396d05..6f20359524 100644
--- a/tests/qemuxml2argvdata/cpu-Haswell.args
+++ b/tests/qemuxml2argvdata/cpu-Haswell.args
@@ -8,7 +8,7 @@ QEMU_AUDIO_DRV=none \
 -name QEMUGuest1 \
 -S \
 -machine pc,accel=kvm,usb=off,dump-guest-core=off \
--cpu Haswell \
+-cpu Haswell,+rtm,+hle \
 -m 214 \
 -smp 6,sockets=6,cores=1,threads=1 \
 -uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
diff --git a/tests/qemuxml2argvdata/cpu-host-model-cmt.args b/tests/qemuxml2argvdata/cpu-host-model-cmt.args
index 8767278d11..d236aa9e09 100644
--- a/tests/qemuxml2argvdata/cpu-host-model-cmt.args
+++ b/tests/qemuxml2argvdata/cpu-host-model-cmt.args
@@ -9,7 +9,8 @@ QEMU_AUDIO_DRV=none \
 -S \
 -machine pc,accel=tcg,usb=off,dump-guest-core=off \
 -cpu Haswell,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,\
-+smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm \
++smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm,+rtm,\
++hle \
 -m 214 \
 -smp 6,sockets=6,cores=1,threads=1 \
 -uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
diff --git a/tests/qemuxml2argvdata/cpu-tsc-frequency.args b/tests/qemuxml2argvdata/cpu-tsc-frequency.args
index 7824dea96f..216fd43014 100644
--- a/tests/qemuxml2argvdata/cpu-tsc-frequency.args
+++ b/tests/qemuxml2argvdata/cpu-tsc-frequency.args
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
 -machine pc,accel=kvm,usb=off,dump-guest-core=off \
 -cpu Haswell,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,\
 +smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm,\
-+invtsc,tsc-frequency=3504000000 \
++invtsc,+rtm,+hle,tsc-frequency=3504000000 \
 -m 214 \
 -smp 1,sockets=1,cores=1,threads=1 \
 -uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
diff --git a/tests/qemuxml2argvdata/q35-acpi-nouefi.args b/tests/qemuxml2argvdata/q35-acpi-nouefi.args
index caef49ea16..a9375a35db 100644
--- a/tests/qemuxml2argvdata/q35-acpi-nouefi.args
+++ b/tests/qemuxml2argvdata/q35-acpi-nouefi.args
@@ -8,7 +8,7 @@ QEMU_AUDIO_DRV=none \
 -name guest \
 -S \
 -machine q35,accel=tcg,usb=off,dump-guest-core=off \
--cpu Haswell \
+-cpu Haswell,+rtm,+hle \
 -m 1024 \
 -smp 1,sockets=1,cores=1,threads=1 \
 -uuid 496d7ea8-9739-544b-4ebd-ef08be936e8b \
diff --git a/tests/qemuxml2argvdata/q35-acpi-uefi.args b/tests/qemuxml2argvdata/q35-acpi-uefi.args
index a3293aeb9d..8e3368b9e9 100644
--- a/tests/qemuxml2argvdata/q35-acpi-uefi.args
+++ b/tests/qemuxml2argvdata/q35-acpi-uefi.args
@@ -8,7 +8,7 @@ QEMU_AUDIO_DRV=none \
 -name guest \
 -S \
 -machine q35,accel=tcg,usb=off,dump-guest-core=off \
--cpu Haswell \
+-cpu Haswell,+rtm,+hle \
 -drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,\
 readonly=on \
 -drive file=/var/lib/libvirt/qemu/nvram/guest_VARS.fd,if=pflash,format=raw,\
diff --git a/tests/qemuxml2argvdata/q35-noacpi-nouefi.args b/tests/qemuxml2argvdata/q35-noacpi-nouefi.args
index fab2a6fcb0..0dd61840ef 100644
--- a/tests/qemuxml2argvdata/q35-noacpi-nouefi.args
+++ b/tests/qemuxml2argvdata/q35-noacpi-nouefi.args
@@ -8,7 +8,7 @@ QEMU_AUDIO_DRV=none \
 -name guest \
 -S \
 -machine q35,accel=tcg,usb=off,dump-guest-core=off \
--cpu Haswell \
+-cpu Haswell,+rtm,+hle \
 -m 1024 \
 -smp 1,sockets=1,cores=1,threads=1 \
 -uuid 496d7ea8-9739-544b-4ebd-ef08be936e8b \
-- 
2.18.0
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