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From 72a1827006be22791017ff2b671eac1c96be5d12 Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Thu, 7 May 2020 22:09:23 +0100
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Subject: [PATCH 01/26] target/i386: set the CPUID level to 0x14 on old
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machine-type
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RH-Author: plai@redhat.com
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Message-id: <20200507220923.13723-1-plai@redhat.com>
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Patchwork-id: 96347
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O-Subject: [RHEL8.2.1 AV qemu-kvm PATCH RESEND] target/i386: set the CPUID level to 0x14 on old machine-type
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Bugzilla: 1513681
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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From: Luwei Kang <luwei.kang@intel.com>
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BZ https://bugzilla.redhat.com/show_bug.cgi?id=1513681
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Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=28146304
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Branch: rhel-av-8.2.1
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Tested on intel-icelake-y-01.ml3.eng.bos.redhat.com.
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The CPUID level need to be set to 0x14 manually on old
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machine-type if Intel PT is enabled in guest. E.g. the
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CPUID[0].EAX(level)=7 and CPUID[7].EBX[25](intel-pt)=1 when the
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Qemu with "-machine pc-i440fx-3.1 -cpu qemu64,+intel-pt" parameter.
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Some Intel PT capabilities are exposed by leaf 0x14 and the
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missing capabilities will cause some MSRs access failed.
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This patch add a warning message to inform the user to extend
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the CPUID level.
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Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Luwei Kang <luwei.kang@intel.com>
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Message-Id: <1584031686-16444-1-git-send-email-luwei.kang@intel.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit ddc2fc9e4e42ebce48b088963dc7fbd1c08d5f33)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 1685a8c..0f0a2db 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -6206,9 +6206,14 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
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x86_cpu_adjust_feat_level(cpu, FEAT_XSAVE);
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/* Intel Processor Trace requires CPUID[0x14] */
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- if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT) &&
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- kvm_enabled() && cpu->intel_pt_auto_level) {
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- x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
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+ if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT)) {
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+ if (cpu->intel_pt_auto_level) {
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+ x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
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+ } else if (cpu->env.cpuid_min_level < 0x14) {
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+ mark_unavailable_features(cpu, FEAT_7_0_EBX,
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+ CPUID_7_0_EBX_INTEL_PT,
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+ "Intel PT need CPUID leaf 0x14, please set by \"-cpu ...,+intel-pt,level=0x14\"");
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+ }
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}
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/* CPU topology with multi-dies support requires CPUID[0x1F] */
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--
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1.8.3.1
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