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From e6e62ad1e8a33076b67b19ce5f03ea6ca6571eef Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Thu, 9 May 2019 22:43:17 +0100
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Subject: [PATCH 1/2] kvm: Use KVM_GET_MSR_INDEX_LIST for
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MSR_IA32_ARCH_CAPABILITIES support
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20190509224318.23376-2-ehabkost@redhat.com>
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Patchwork-id: 87251
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 1/2] kvm: Use KVM_GET_MSR_INDEX_LIST for MSR_IA32_ARCH_CAPABILITIES support
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Bugzilla: 1707706
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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From: Bandan Das <bsd@redhat.com>
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When writing to guest's MSR_IA32_ARCH_CAPABILITIES, check whether it's
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supported in the guest using the KVM_GET_MSR_INDEX_LIST ioctl.
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Fixes: d86f963694df27f11b3681ffd225c9362de1b634
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Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
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Tested-by: balducci@units.it
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Signed-off-by: Bandan Das <bsd@redhat.com>
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Message-Id: <jpg4lc4iiav.fsf_-_@linux.bootlegged.copy>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit aec5e9c3a94cf8b7920f59bef69a6f426092c4a0)
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Signed-off-by: Eduardo Habkost <ehabkost@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/kvm.c | 15 +++++++--------
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1 file changed, 7 insertions(+), 8 deletions(-)
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index f1626a4..e3e8c78 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -94,6 +94,7 @@ static bool has_msr_xss;
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static bool has_msr_spec_ctrl;
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static bool has_msr_virt_ssbd;
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static bool has_msr_smi_count;
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+static bool has_msr_arch_capabs;
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static uint32_t has_architectural_pmu_version;
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static uint32_t num_architectural_pmu_gp_counters;
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@@ -1330,6 +1331,9 @@ static int kvm_get_supported_msrs(KVMState *s)
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case MSR_VIRT_SSBD:
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has_msr_virt_ssbd = true;
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break;
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+ case MSR_IA32_ARCH_CAPABILITIES:
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+ has_msr_arch_capabs = true;
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+ break;
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}
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}
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}
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@@ -1834,14 +1838,9 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
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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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+ if (has_msr_arch_capabs) {
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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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}
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/*
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--
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1.8.3.1
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