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From 4263a1e54da9f6e1d1b0aa74d52436224a6cfd5e Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Tue, 20 Aug 2019 00:24:35 +0100
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Subject: [PATCH 4/9] x86: define a new MSR based feature word --
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FEATURE_WORDS_ARCH_CAPABILITIES
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RH-Author: plai@redhat.com
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Message-id: <1566260680-20995-5-git-send-email-plai@redhat.com>
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Patchwork-id: 90069
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O-Subject: [RHEL8.0 qemu-kvm PATCH v3 4/9] x86: define a new MSR based feature word -- FEATURE_WORDS_ARCH_CAPABILITIES
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Bugzilla: 1718235
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Robert Hoo <robert.hu@linux.intel.com>
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Note RSBA is specially treated -- no matter host support it or not, qemu
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pretends it is supported.
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Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
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Message-Id: <1539578845-37944-4-git-send-email-robert.hu@linux.intel.com>
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[ehabkost: removed automatic enabling of RSBA]
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Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit d86f963694df27f11b3681ffd225c9362de1b634)
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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 | 24 +++++++++++++++++++++++-
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target/i386/cpu.h | 8 ++++++++
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target/i386/kvm.c | 11 +++++++++++
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3 files changed, 42 insertions(+), 1 deletion(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index bbca6f4..fbcf124 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -1143,6 +1143,27 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
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},
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.tcg_features = ~0U,
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},
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+ /*Below are MSR exposed features*/
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+ [FEAT_ARCH_CAPABILITIES] = {
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+ .type = MSR_FEATURE_WORD,
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+ .feat_names = {
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+ "rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry",
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+ "ssb-no", NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ NULL, NULL, NULL, NULL,
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+ },
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+ .msr = {
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+ .index = MSR_IA32_ARCH_CAPABILITIES,
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+ .cpuid_dep = {
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+ FEAT_7_0_EDX,
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+ CPUID_7_0_EDX_ARCH_CAPABILITIES
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+ }
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+ },
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+ },
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};
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typedef struct X86RegisterInfo32 {
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@@ -3550,7 +3571,8 @@ static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w,
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wi->cpuid.reg);
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break;
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case MSR_FEATURE_WORD:
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- r = kvm_arch_get_supported_msr_feature(kvm_state, wi->msr.index);
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+ r = kvm_arch_get_supported_msr_feature(kvm_state,
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+ wi->msr.index);
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break;
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}
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} else if (hvf_enabled()) {
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diff --git a/target/i386/cpu.h b/target/i386/cpu.h
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index e5e5169..6820a70 100644
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--- a/target/i386/cpu.h
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+++ b/target/i386/cpu.h
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@@ -500,6 +500,7 @@ typedef enum FeatureWord {
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FEAT_6_EAX, /* CPUID[6].EAX */
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FEAT_XSAVE_COMP_LO, /* CPUID[EAX=0xd,ECX=0].EAX */
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FEAT_XSAVE_COMP_HI, /* CPUID[EAX=0xd,ECX=0].EDX */
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+ FEAT_ARCH_CAPABILITIES,
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FEATURE_WORDS,
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} FeatureWord;
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@@ -726,6 +727,13 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
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#define CPUID_TOPOLOGY_LEVEL_SMT (1U << 8)
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#define CPUID_TOPOLOGY_LEVEL_CORE (2U << 8)
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+/* MSR Feature Bits */
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+#define MSR_ARCH_CAP_RDCL_NO (1U << 0)
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+#define MSR_ARCH_CAP_IBRS_ALL (1U << 1)
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+#define MSR_ARCH_CAP_RSBA (1U << 2)
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+#define MSR_ARCH_CAP_SKIP_L1DFL_VMENTRY (1U << 3)
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+#define MSR_ARCH_CAP_SSB_NO (1U << 4)
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+
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#ifndef HYPERV_SPINLOCK_NEVER_RETRY
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#define HYPERV_SPINLOCK_NEVER_RETRY 0xFFFFFFFF
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#endif
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index 87e4771..187ee19 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -1753,6 +1753,17 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
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}
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#endif
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+ /* If host supports feature MSR, write down. */
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+ if (kvm_feature_msrs) {
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+ int i;
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+ for (i = 0; i < kvm_feature_msrs->nmsrs; i++)
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+ if (kvm_feature_msrs->indices[i] == MSR_IA32_ARCH_CAPABILITIES) {
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+ kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES,
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+ env->features[FEAT_ARCH_CAPABILITIES]);
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+ break;
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+ }
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+ }
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+
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/*
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* The following MSRs have side effects on the guest or are too heavy
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* for normal writeback. Limit them to reset or full state updates.
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--
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1.8.3.1
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