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From 5763ad32288d76433b01ce87f75cbf886f6f0e20 Mon Sep 17 00:00:00 2001
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From: Andrew Jones <drjones@redhat.com>
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Date: Tue, 14 Jan 2014 09:26:23 +0100
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Subject: [PATCH 14/16] enable pvticketlocks by default
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RH-Author: Andrew Jones <drjones@redhat.com>
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Message-id: <1389691583-3060-1-git-send-email-drjones@redhat.com>
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Patchwork-id: 56650
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O-Subject: [RHEL7.0 qemu-kvm PATCH] enable pvticketlocks by default
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Bugzilla: 1052340
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RH-Acked-by: Rik van Riel <riel@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RHEL-only
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1052340
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Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=6860390
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Let's turn pvticketlocks on by default. We need to get them more exposed
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if we're ever going to make a final decision about them being on/off.
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So we turn them on now, and if we'll have any issues during our
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pre-release testing, then we'll just revert this patch. Since this is
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something of a test patch, we leave it as RHEL only for now. We can post
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an upstream patch later when we're sure it's the right way to go.
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We only enable by default on rhel7 for now, not rhel6 and earlier,
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although rhel6 kernels wouldn't enable it anyway, as they don't have
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pvticketlocks. Tested by me.
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Signed-off-by: Andrew Jones <drjones@redhat.com>
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---
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hw/i386/pc_piix.c | 2 ++
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target-i386/cpu.c | 6 ++++++
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target-i386/cpu.h | 1 +
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3 files changed, 9 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/i386/pc_piix.c | 2 ++
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target-i386/cpu.c | 6 ++++++
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target-i386/cpu.h | 1 +
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3 files changed, 9 insertions(+), 0 deletions(-)
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diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
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index 76d6e93..2961bc8 100644
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--- a/hw/i386/pc_piix.c
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+++ b/hw/i386/pc_piix.c
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@@ -902,6 +902,8 @@ static void pc_init_rhel650(QEMUMachineInitArgs *args)
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x86_cpu_compat_set_features("Opteron_G3", FEAT_8000_0001_EDX,
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0, CPUID_EXT2_RDTSCP);
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+ disable_kvm_pv_unhalt();
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+
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rom_file_in_ram = false;
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has_acpi_build = false;
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pc_init_rhel700(args);
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index 42105aa..2959915 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -253,6 +253,7 @@ static uint32_t kvm_default_features = (1 << KVM_FEATURE_CLOCKSOURCE) |
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(1 << KVM_FEATURE_ASYNC_PF) |
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(1 << KVM_FEATURE_STEAL_TIME) |
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(1 << KVM_FEATURE_PV_EOI) |
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+ (1 << KVM_FEATURE_PV_UNHALT) |
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(1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
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void disable_kvm_pv_eoi(void)
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@@ -260,6 +261,11 @@ void disable_kvm_pv_eoi(void)
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kvm_default_features &= ~(1UL << KVM_FEATURE_PV_EOI);
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}
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+void disable_kvm_pv_unhalt(void)
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+{
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+ kvm_default_features &= ~(1UL << KVM_FEATURE_PV_UNHALT);
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+}
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+
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void host_cpuid(uint32_t function, uint32_t count,
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uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
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{
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diff --git a/target-i386/cpu.h b/target-i386/cpu.h
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index 9c55953..37ff264 100644
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--- a/target-i386/cpu.h
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+++ b/target-i386/cpu.h
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@@ -1281,6 +1281,7 @@ void do_smm_enter(CPUX86State *env1);
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void cpu_report_tpr_access(CPUX86State *env, TPRAccess access);
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void disable_kvm_pv_eoi(void);
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+void disable_kvm_pv_unhalt(void);
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void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
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uint32_t feat_add, uint32_t feat_remove);
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--
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1.7.1
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