Sometime, we need to adjust some state in order to reflect guest CPUID
setting, e.g. if we don't expose rdtscp to guest, we won't want to enable
it on hardware. cpuid_update() is introduced for this purpose.
Also export kvm_find_cpuid_entry() for later use.
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 6 ++++++
arch/x86/kvm/vmx.c | 6 ++++++
arch/x86/kvm/x86.c | 3 +++
4 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4f865e8..d2a91ae 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -471,6 +471,7 @@ struct kvm_x86_ops {
int (*hardware_setup)(void); /* __init */
void (*hardware_unsetup)(void); /* __exit */
bool (*cpu_has_accelerated_tpr)(void);
+ void (*cpuid_update)(struct kvm_vcpu *vcpu);
/* Create, but do not attach this VCPU */
struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 3de0b37..d89b0a0 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2854,6 +2854,10 @@ static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
return 0;
}
+static void svm_cpuid_update(struct kvm_vcpu *vcpu)
+{
+}
+
static const struct trace_print_flags svm_exit_reasons_str[] = {
{ SVM_EXIT_READ_CR0, "read_cr0" },
{ SVM_EXIT_READ_CR3, "read_cr3" },
@@ -2978,6 +2982,8 @@ static struct kvm_x86_ops svm_x86_ops = {
.exit_reasons_str = svm_exit_reasons_str,
.gb_page_enable = svm_gb_page_enable,
+
+ .cpuid_update = svm_cpuid_update,
};
static int __init svm_init(void)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5c464ed..91dff23 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3961,6 +3961,10 @@ static bool vmx_gb_page_enable(void)
return false;
}
+static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
+{
+}
+
static struct kvm_x86_ops vmx_x86_ops = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
@@ -4025,6 +4029,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
.exit_reasons_str = vmx_exit_reasons_str,
.gb_page_enable = vmx_gb_page_enable,
+
+ .cpuid_update = vmx_cpuid_update,
};
static int __init vmx_init(void)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9ce7917..e16dede 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1574,6 +1574,7 @@ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
cpuid_fix_nx_cap(vcpu);
r = 0;
kvm_apic_set_version(vcpu);
+ kvm_x86_ops->cpuid_update(vcpu);
out_free:
vfree(cpuid_entries);
@@ -1596,6 +1597,7 @@ static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
goto out;
vcpu->arch.cpuid_nent = cpuid->nent;
kvm_apic_set_version(vcpu);
+ kvm_x86_ops->cpuid_update(vcpu);
return 0;
out:
@@ -3730,6 +3732,7 @@ struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
}
return best;
}
+EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
{
--
1.5.4.5
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