From: Vineeth Pillai <viremana@xxxxxxxxxxxxxxxxxxx> Sent: Thursday, June 3, 2021 8:15 AM
>
> 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;
Perhaps add a "BUILD_BUG_ON" to verify that struct
hv_enlightenments fits in the space allocated for
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
