1 files changed, 63 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm_onhyperv.c b/arch/x86/kvm/svm/svm_onhyperv.c
new file mode 100644
index 000000000000..a8e78c0e5956
--- /dev/null
+++ b/arch/x86/kvm/svm/svm_onhyperv.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * KVM L1 hypervisor optimizations on Hyper-V for SVM.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kvm_host.h>
+
+#include <asm/mshyperv.h>
+
+#include "svm.h"
+#include "svm_ops.h"
+
+#include "hyperv.h"
+#include "kvm_onhyperv.h"
+#include "svm_onhyperv.h"
+
+static int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu)
+{
+	struct hv_vmcb_enlightenments *hve;
+	hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu);
+
+	if (partition_assist_page == INVALID_PAGE)
+		return -ENOMEM;
+
+	hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
+
+	hve->partition_assist_page = partition_assist_page;
+	hve->hv_vm_id = (unsigned long)vcpu->kvm;
+	if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
+		hve->hv_enlightenments_control.nested_flush_hypercall = 1;
+		vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
+	}
+
+	return 0;
+}
+
+__init void svm_hv_hardware_setup(void)
+{
+	if (npt_enabled &&
+	    ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
+		pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
+		svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;
+		svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range;
+	}
+
+	if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
+		int cpu;
+
+		pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
+		for_each_online_cpu(cpu) {
+			struct hv_vp_assist_page *vp_ap =
+				hv_get_vp_assist_page(cpu);
+
+			if (!vp_ap)
+				continue;
+
+			vp_ap->nested_control.features.directhypercall = 1;
+		}
+		svm_x86_ops.enable_l2_tlb_flush =
+				svm_hv_enable_l2_tlb_flush;
+	}
+}