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From 04f34e7c0b0fada186ca7012f5f4168f46483c5f Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Mon, 1 Jul 2019 16:17:34 +0100
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Subject: [PATCH 05/39] i386: Disable OSPKE on CPU model definitions
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RH-Author: plai@redhat.com
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Message-id: <1561997854-9646-6-git-send-email-plai@redhat.com>
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Patchwork-id: 89334
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O-Subject: [RHEL8.1 qemu-kvm PATCH v6 5/5] i386: Disable OSPKE on CPU model definitions
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Bugzilla: 1629906
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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From: Eduardo Habkost <ehabkost@redhat.com>
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Currently, the Cascadelake-Server, Icelake-Client, and
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Icelake-Server are always generating the following warning:
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qemu-system-x86_64: warning: \
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host doesn't support requested feature: CPUID.07H:ECX [bit 4]
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This happens because OSPKE was never returned by
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GET_SUPPORTED_CPUID or x86_cpu_get_supported_feature_word().
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OSPKE is a runtime flag automatically set by the KVM module or by
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TCG code, was always cleared by x86_cpu_filter_features(), and
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was not supposed to appear on the CPU model table.
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Remove the OSPKE flag from the CPU model table entries, to avoid
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the bogus warning and avoid returning invalid feature data on
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query-cpu-* QMP commands. As OSPKE was always cleared by
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x86_cpu_filter_features(), this won't have any guest-visible
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impact.
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Include a test case that should detect the problem if we introduce
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a similar bug again.
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Fixes: c7a88b52f62b ("i386: Add new model of Cascadelake-Server")
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Fixes: 8a11c62da914 ("i386: Add new CPU model Icelake-{Server,Client}")
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Cc: Tao Xu <tao3.xu@intel.com>
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Cc: Robert Hoo <robert.hu@linux.intel.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Message-Id: <20190319200515.14999-1-ehabkost@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit bb4928c7cafe50ab2137a0034e350ef1bfa044d9)
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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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Conflicts:
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target/i386/cpu.c
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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 | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 2538d82..af62281 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -2517,7 +2517,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
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CPUID_7_0_EBX_AVX512BW | CPUID_7_0_EBX_AVX512CD |
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CPUID_7_0_EBX_AVX512VL | CPUID_7_0_EBX_CLFLUSHOPT,
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.features[FEAT_7_0_ECX] =
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- CPUID_7_0_ECX_PKU | CPUID_7_0_ECX_OSPKE |
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+ CPUID_7_0_ECX_PKU |
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CPUID_7_0_ECX_AVX512VNNI,
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.features[FEAT_7_0_EDX] =
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CPUID_7_0_EDX_SPEC_CTRL | CPUID_7_0_EDX_SPEC_CTRL_SSBD,
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--
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1.8.3.1
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