Enable remote TLB flush for SVM.
Signed-off-by: Vineeth Pillai <viremana@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm/svm.c | 9 +++++
arch/x86/kvm/svm/svm_onhyperv.h | 66 +++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)
create mode 100644 arch/x86/kvm/svm/svm_onhyperv.h
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b649f92287a2..a39865dbc200 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -43,6 +43,9 @@
#include "svm.h"
#include "svm_ops.h"
+#include "kvm_onhyperv.h"
+#include "svm_onhyperv.h"
+
#define __ex(x) __kvm_handle_fault_on_reboot(x)
MODULE_AUTHOR("Qumranet");
@@ -992,6 +995,8 @@ static __init int svm_hardware_setup(void)
/* Note, SEV setup consumes npt_enabled. */
sev_hardware_setup();
+ svm_hv_hardware_setup();
+
svm_adjust_mmio_mask();
for_each_possible_cpu(cpu) {
@@ -1276,6 +1281,8 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
}
}
+ svm_hv_init_vmcb(svm->vmcb);
+
vmcb_mark_all_dirty(svm->vmcb);
enable_gif(svm);
@@ -3884,6 +3891,8 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
svm->vmcb->control.nested_cr3 = __sme_set(root_hpa);
vmcb_mark_dirty(svm->vmcb, VMCB_NPT);
+ hv_track_root_tdp(vcpu, root_hpa);
+
/* Loading L2's CR3 is handled by enter_svm_guest_mode. */
if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
return;
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h
new file mode 100644
index 000000000000..57291e222395
--- /dev/null
+++ b/arch/x86/kvm/svm/svm_onhyperv.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * KVM L1 hypervisor optimizations on Hyper-V for SVM.
+ */
+
+#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
+#define __ARCH_X86_KVM_SVM_ONHYPERV_H__
+
+#if IS_ENABLED(CONFIG_HYPERV)
+#include <asm/mshyperv.h>
+
+#include "hyperv.h"
+#include "kvm_onhyperv.h"
+
+static struct kvm_x86_ops svm_x86_ops;
+
+/*
+ * Hyper-V uses the software reserved 32 bytes in VMCB
+ * control area to expose SVM enlightenments to guests.
+ */
+struct hv_enlightenments {
+ struct __packed hv_enlightenments_control {
+ u32 nested_flush_hypercall:1;
+ u32 msr_bitmap:1;
+ u32 enlightened_npt_tlb: 1;
+ u32 reserved:29;
+ } __packed hv_enlightenments_control;
+ u32 hv_vp_id;
+ u64 hv_vm_id;
+ u64 partition_assist_page;
+ u64 reserved;
+} __packed;
+
+static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
+{
+ struct hv_enlightenments *hve =
+ (struct hv_enlightenments *)vmcb->control.reserved_sw;
+
+ if (npt_enabled &&
+ ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
+ hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
+}
+
+static inline void svm_hv_hardware_setup(void)
+{
+ if (npt_enabled &&
+ ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
+ pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
+ svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
+ svm_x86_ops.tlb_remote_flush_with_range =
+ hv_remote_flush_tlb_with_range;
+ }
+}
+
+#else
+
+static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
+{
+}
+
+static inline void svm_hv_hardware_setup(void)
+{
+}
+#endif /* CONFIG_HYPERV */
+
+#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */
--
2.25.1
