Commit b4128000 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

KVM: x86: hyper-v: Prepare to check access to Hyper-V MSRs 



Introduce hv_check_msr_access() to check if the particular MSR
should be accessible by guest, this will be used with
KVM_CAP_HYPERV_ENFORCE_CPUID mode.

No functional change intended.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-5-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 10d7bf1e

arch/x86/kvm/hyperv.c

+18 −0
Original line number Diff line number Diff line
@@ -1202,12 +1202,21 @@ void kvm_hv_invalidate_tsc_page(struct kvm *kvm) 
	mutex_unlock(&hv->hv_lock);

}





static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr)

{

	return true;

}



static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,

			     bool host)

{

	struct kvm *kvm = vcpu->kvm;

	struct kvm_hv *hv = to_kvm_hv(kvm);



	if (unlikely(!host && !hv_check_msr_access(to_hv_vcpu(vcpu), msr)))

		return 1;



	switch (msr) {

	case HV_X64_MSR_GUEST_OS_ID:

		hv->hv_guest_os_id = data;
@@ -1336,6 +1345,9 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 
{

	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);



	if (unlikely(!host && !hv_check_msr_access(hv_vcpu, msr)))

		return 1;



	switch (msr) {

	case HV_X64_MSR_VP_INDEX: {

		struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
@@ -1450,6 +1462,9 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, 
	struct kvm *kvm = vcpu->kvm;

	struct kvm_hv *hv = to_kvm_hv(kvm);



	if (unlikely(!host && !hv_check_msr_access(to_hv_vcpu(vcpu), msr)))

		return 1;



	switch (msr) {

	case HV_X64_MSR_GUEST_OS_ID:

		data = hv->hv_guest_os_id;
@@ -1499,6 +1514,9 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, 
	u64 data = 0;

	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);



	if (unlikely(!host && !hv_check_msr_access(hv_vcpu, msr)))

		return 1;



	switch (msr) {

	case HV_X64_MSR_VP_INDEX:

		data = hv_vcpu->vp_index;