147 lines
4.2 KiB
Diff
147 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Robert Hoo <robert.hu@linux.intel.com>
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Date: Mon, 15 Oct 2018 12:47:23 +0800
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Subject: [PATCH 3/9] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and
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KVM_GET_MSRS system ioctl
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Add kvm_get_supported_feature_msrs() to get supported MSR feature index list.
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Add kvm_arch_get_supported_msr_feature() to get each MSR features value.
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Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
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Message-Id: <1539578845-37944-2-git-send-email-robert.hu@linux.intel.com>
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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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---
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include/sysemu/kvm.h | 2 ++
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target/i386/kvm.c | 80 ++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 82 insertions(+)
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diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
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index 0b64b8e067..97d8d9d0d5 100644
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--- a/include/sysemu/kvm.h
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+++ b/include/sysemu/kvm.h
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@@ -463,6 +463,8 @@ int kvm_vm_check_extension(KVMState *s, unsigned int extension);
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uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
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uint32_t index, int reg);
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+uint32_t kvm_arch_get_supported_msr_feature(KVMState *s, uint32_t index);
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+
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void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len);
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index 9313602d3d..cd45c79169 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -107,6 +107,7 @@ static int has_pit_state2;
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static bool has_msr_mcg_ext_ctl;
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static struct kvm_cpuid2 *cpuid_cache;
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+static struct kvm_msr_list *kvm_feature_msrs;
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int kvm_has_pit_state2(void)
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{
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@@ -420,6 +421,42 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
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return ret;
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}
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+uint32_t kvm_arch_get_supported_msr_feature(KVMState *s, uint32_t index)
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+{
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+ struct {
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+ struct kvm_msrs info;
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+ struct kvm_msr_entry entries[1];
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+ } msr_data;
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+ uint32_t ret;
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+
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+ if (kvm_feature_msrs == NULL) { /* Host doesn't support feature MSRs */
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+ return 0;
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+ }
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+
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+ /* Check if requested MSR is supported feature MSR */
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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] == index) {
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+ break;
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+ }
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+ if (i == kvm_feature_msrs->nmsrs) {
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+ return 0; /* if the feature MSR is not supported, simply return 0 */
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+ }
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+
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+ msr_data.info.nmsrs = 1;
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+ msr_data.entries[0].index = index;
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+
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+ ret = kvm_ioctl(s, KVM_GET_MSRS, &msr_data);
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+ if (ret != 1) {
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+ error_report("KVM get MSR (index=0x%x) feature failed, %s",
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+ index, strerror(-ret));
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+ exit(1);
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+ }
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+
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+ return msr_data.entries[0].data;
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+}
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+
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+
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typedef struct HWPoisonPage {
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ram_addr_t ram_addr;
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QLIST_ENTRY(HWPoisonPage) list;
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@@ -1239,6 +1276,47 @@ void kvm_arch_do_init_vcpu(X86CPU *cpu)
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}
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}
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+static int kvm_get_supported_feature_msrs(KVMState *s)
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+{
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+ int ret = 0;
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+
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+ if (kvm_feature_msrs != NULL) {
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+ return 0;
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+ }
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+
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+ if (!kvm_check_extension(s, KVM_CAP_GET_MSR_FEATURES)) {
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+ return 0;
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+ }
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+
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+ struct kvm_msr_list msr_list;
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+
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+ msr_list.nmsrs = 0;
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+ ret = kvm_ioctl(s, KVM_GET_MSR_FEATURE_INDEX_LIST, &msr_list);
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+ if (ret < 0 && ret != -E2BIG) {
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+ error_report("Fetch KVM feature MSR list failed: %s",
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+ strerror(-ret));
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+ return ret;
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+ }
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+
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+ assert(msr_list.nmsrs > 0);
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+ kvm_feature_msrs = (struct kvm_msr_list *) \
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+ g_malloc0(sizeof(msr_list) +
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+ msr_list.nmsrs * sizeof(msr_list.indices[0]));
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+
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+ kvm_feature_msrs->nmsrs = msr_list.nmsrs;
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+ ret = kvm_ioctl(s, KVM_GET_MSR_FEATURE_INDEX_LIST, kvm_feature_msrs);
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+
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+ if (ret < 0) {
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+ error_report("Fetch KVM feature MSR list failed: %s",
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+ strerror(-ret));
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+ g_free(kvm_feature_msrs);
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+ kvm_feature_msrs = NULL;
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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static int kvm_get_supported_msrs(KVMState *s)
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{
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static int kvm_supported_msrs;
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@@ -1400,6 +1478,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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return ret;
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}
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+ kvm_get_supported_feature_msrs(s);
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+
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uname(&utsname);
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lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
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--
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2.20.1
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