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From dd8556fe139be9237694229e55ac3762ec71eca5 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Wed, 9 Oct 2019 17:51:46 +0200
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Subject: [PATCH 08/10] 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: <20191009175148.1361-9-ehabkost@redhat.com>
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Patchwork-id: 91363
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O-Subject: [RHEL-7.7.z qemu-kvm PATCH 08/10] kvm: Use KVM_GET_MSR_INDEX_LIST for MSR_IA32_ARCH_CAPABILITIES support
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Bugzilla: 1730606
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@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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7.8 backport conflicts (plai):
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target/i386/kvm.c changes to target-i386/kvm.c
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7.7.z backport notes (ehabkost):
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* Cherry pick from 7.8 tree with no conflicts
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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: Paul Lai <plai@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu.h | 1 +
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target-i386/kvm.c | 19 +++++++++++--------
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2 files changed, 12 insertions(+), 8 deletions(-)
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diff --git a/target-i386/cpu.h b/target-i386/cpu.h
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index 1c62e63..d855ae3 100644
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--- a/target-i386/cpu.h
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+++ b/target-i386/cpu.h
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@@ -1066,6 +1066,7 @@ typedef struct CPUX86State {
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uint64_t spec_ctrl;
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uint64_t virt_ssbd;
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+ uint64_t virt_arch_capabs;
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TPRAccess tpr_access_type;
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} CPUX86State;
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diff --git a/target-i386/kvm.c b/target-i386/kvm.c
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index 180ae56..bc3a514 100644
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--- a/target-i386/kvm.c
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+++ b/target-i386/kvm.c
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@@ -80,6 +80,7 @@ static bool has_msr_mtrr;
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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_arch_capabs;
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static bool has_msr_architectural_pmu;
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static uint32_t num_architectural_pmu_counters;
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@@ -888,6 +889,10 @@ static int kvm_get_supported_msrs(KVMState *s)
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has_msr_virt_ssbd = true;
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continue;
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}
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+ if (kvm_msr_list->indices[i] == MSR_IA32_ARCH_CAPABILITIES) {
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+ has_msr_arch_capabs = true;
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+ continue;
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+ }
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}
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}
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@@ -1326,14 +1331,9 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
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}
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}
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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_set(&msrs[n++], 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_set(&msrs[n++], 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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* The following MSRs have side effects on the guest or are too heavy
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@@ -1925,6 +1925,9 @@ static int kvm_get_msrs(X86CPU *cpu)
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case MSR_VIRT_SSBD:
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env->virt_ssbd = msrs[i].data;
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break;
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+ case MSR_IA32_ARCH_CAPABILITIES:
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+ env->features[FEAT_ARCH_CAPABILITIES] = msrs[i].data;
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+ break;
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}
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}
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--
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1.8.3.1
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