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Peter Anvin" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "K. Y. Srinivasan" , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org Subject: [PATCH v2 4/7] KVM: SVM: hyper-v: Nested enlightenments in VMCB Date: Thu, 15 Apr 2021 13:43:39 +0000 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- arch/x86/include/asm/svm.h | 24 +++++++++++++++++++++++- arch/x86/kvm/svm/svm.c | 8 ++++++++ arch/x86/kvm/svm/svm.h | 30 ++++++++++++++++++++++++++++-- 3 files changed, 59 insertions(+), 3 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..2ad1f55c88d0 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include #include @@ -122,6 +123,8 @@ bool npt_enabled = true; bool npt_enabled; #endif +u32 __read_mostly vmcb_all_clean_mask = VMCB_ALL_CLEAN_MASK; + /* * 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 |= VMCB_HYPERV_CLEAN_MASK; +#endif + return 0; err: diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 39e071fdab0c..63ed05c8027b 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -33,6 +33,11 @@ static const u32 host_save_user_msrs[] = { extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly; extern bool npt_enabled; +/* + * Clean bits in VMCB. + * VMCB_ALL_CLEAN_MASK and VMCB_HYPERV_CLEAN_MASK might + * also need to be updated if this enum is modified. + */ enum { VMCB_INTERCEPTS, /* Intercept vectors, TSC offset, pause filter count */ @@ -50,12 +55,28 @@ enum { * AVIC PHYSICAL_TABLE pointer, * AVIC LOGICAL_TABLE pointer */ - VMCB_DIRTY_MAX, +#if IS_ENABLED(CONFIG_HYPERV) + VMCB_HV_NESTED_ENLIGHTENMENTS = 31, +#endif }; +#define VMCB_ALL_CLEAN_MASK ( \ + (1U << VMCB_INTERCEPTS) | (1U << VMCB_PERM_MAP) | \ + (1U << VMCB_ASID) | (1U << VMCB_INTR) | \ + (1U << VMCB_NPT) | (1U << VMCB_CR) | (1U << VMCB_DR) | \ + (1U << VMCB_DT) | (1U << VMCB_SEG) | (1U << VMCB_CR2) | \ + (1U << VMCB_LBR) | (1U << VMCB_AVIC) \ + ) + +#if IS_ENABLED(CONFIG_HYPERV) +#define VMCB_HYPERV_CLEAN_MASK (1U << VMCB_HV_NESTED_ENLIGHTENMENTS) +#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 +251,7 @@ 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 +260,11 @@ 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