[PATCH v3 4/7] KVM: SVM: hyper-v: Nested enlightenments in VMCB
From: Vineeth Pillai <hidden>
Date: 2021-04-21 14:07:23
Also in:
kvm, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Add Hyper-V specific fields in VMCB to support SVM enlightenments. Also a small refactoring of VMCB clean bits handling. Signed-off-by: Vineeth Pillai <redacted> --- arch/x86/include/asm/svm.h | 24 +++++++++++++++++++++++- arch/x86/kvm/svm/svm.c | 8 ++++++++ arch/x86/kvm/svm/svm.h | 12 +++++++++++- 3 files changed, 42 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 1c561945b426..3586d7523ce8 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h@@ -322,9 +322,31 @@ static inline void __unused_size_checks(void) BUILD_BUG_ON(sizeof(struct ghcb) != EXPECTED_GHCB_SIZE); } + +#if IS_ENABLED(CONFIG_HYPERV) +struct __packed hv_enlightenments { + struct __packed hv_enlightenments_control { + u32 nested_flush_hypercall:1; + u32 msr_bitmap:1; + u32 enlightened_npt_tlb: 1; + u32 reserved:29; + } hv_enlightenments_control; + u32 hv_vp_id; + u64 hv_vm_id; + u64 partition_assist_page; + u64 reserved; +}; +#define VMCB_CONTROL_END 992 // 32 bytes for Hyper-V +#else +#define VMCB_CONTROL_END 1024 +#endif + struct vmcb { struct vmcb_control_area control; - u8 reserved_control[1024 - sizeof(struct vmcb_control_area)]; + u8 reserved_control[VMCB_CONTROL_END - sizeof(struct vmcb_control_area)]; +#if IS_ENABLED(CONFIG_HYPERV) + struct hv_enlightenments hv_enlightenments; +#endif struct vmcb_save_area save; } __packed;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index baee91c1e936..9a241a0806cd 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c@@ -31,6 +31,7 @@ #include <asm/tlbflush.h> #include <asm/desc.h> #include <asm/debugreg.h> +#include <asm/hypervisor.h> #include <asm/kvm_para.h> #include <asm/irq_remapping.h> #include <asm/spec-ctrl.h>
@@ -122,6 +123,8 @@ bool npt_enabled = true; bool npt_enabled; #endif +u32 __read_mostly vmcb_all_clean_mask = ((1 << VMCB_DIRTY_MAX) - 1); + /* * These 2 parameters are used to config the controls for Pause-Loop Exiting: * pause_filter_count: On processors that support Pause filtering(indicated
@@ -1051,6 +1054,11 @@ static __init int svm_hardware_setup(void) */ allow_smaller_maxphyaddr = !npt_enabled; +#if IS_ENABLED(CONFIG_HYPERV) + if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) + vmcb_all_clean_mask |= BIT(VMCB_HV_NESTED_ENLIGHTENMENTS); +#endif + return 0; err:
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 39e071fdab0c..ff0a70bd7fce 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h@@ -51,11 +51,16 @@ enum { * AVIC LOGICAL_TABLE pointer */ VMCB_DIRTY_MAX, +#if IS_ENABLED(CONFIG_HYPERV) + VMCB_HV_NESTED_ENLIGHTENMENTS = 31, +#endif }; /* TPR and CR2 are always written before VMRUN */ #define VMCB_ALWAYS_DIRTY_MASK ((1U << VMCB_INTR) | (1U << VMCB_CR2)) +extern u32 vmcb_all_clean_mask __read_mostly; + struct kvm_sev_info { bool active; /* SEV enabled guest */ bool es_active; /* SEV-ES enabled guest */
@@ -230,7 +235,7 @@ static inline void vmcb_mark_all_dirty(struct vmcb *vmcb) static inline void vmcb_mark_all_clean(struct vmcb *vmcb) { - vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1) + vmcb->control.clean = vmcb_all_clean_mask & ~VMCB_ALWAYS_DIRTY_MASK; }
@@ -239,6 +244,11 @@ static inline void vmcb_mark_dirty(struct vmcb *vmcb, int bit) vmcb->control.clean &= ~(1 << bit); } +static inline bool vmcb_is_clean(struct vmcb *vmcb, int bit) +{ + return (vmcb->control.clean & (1 << bit)); +} + static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu) { return container_of(vcpu, struct vcpu_svm, vcpu);
--
2.25.1