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[v3,12/34] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use

Message ID 20220414132013.1588929-13-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush feature | expand

Commit Message

Vitaly Kuznetsov April 14, 2022, 1:19 p.m. UTC 
To handle L2 TLB flush requests, KVM needs to keep track of L2's VM_ID/
VP_IDs which are set by L1 hypervisor. 'Partition assist page' address is
also needed to handle post-flush exit to L1 upon request.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/include/asm/kvm_host.h |  6 ++++++
 arch/x86/kvm/vmx/nested.c       | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

Comments

Maxim Levitsky May 11, 2022, 11:25 a.m. UTC | #1 
On Thu, 2022-04-14 at 15:19 +0200, Vitaly Kuznetsov wrote:
> To handle L2 TLB flush requests, KVM needs to keep track of L2's VM_ID/
> VP_IDs which are set by L1 hypervisor. 'Partition assist page' address is
> also needed to handle post-flush exit to L1 upon request.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
>  arch/x86/include/asm/kvm_host.h |  6 ++++++
>  arch/x86/kvm/vmx/nested.c       | 15 +++++++++++++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 837c07e213de..8b2a52bf26c0 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -622,6 +622,12 @@ struct kvm_vcpu_hv {
>  
>  	/* Preallocated buffer for handling hypercalls passing sparse vCPU set */
>  	u64 sparse_banks[64];
> +
> +	struct {
> +		u64 pa_page_gpa;
> +		u64 vm_id;
> +		u32 vp_id;
> +	} nested;
>  };
>  
>  /* Xen HVM per vcpu emulation context */
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index a6688663da4d..ee88921c6156 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -225,6 +225,7 @@ static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
>  
>  static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
>  {
> +	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
>  	struct vcpu_vmx *vmx = to_vmx(vcpu);
>  
>  	if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
> @@ -233,6 +234,12 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
>  	}
>  
>  	vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
> +
> +	if (hv_vcpu) {
> +		hv_vcpu->nested.pa_page_gpa = INVALID_GPA;
> +		hv_vcpu->nested.vm_id = 0;
> +		hv_vcpu->nested.vp_id = 0;
> +	}
>  }
>  
>  static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
> @@ -1591,11 +1598,19 @@ static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields
>  {
>  	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
>  	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
> +	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(&vmx->vcpu);
>  
>  	/* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
>  	vmcs12->tpr_threshold = evmcs->tpr_threshold;
>  	vmcs12->guest_rip = evmcs->guest_rip;
>  
> +	if (unlikely(!(hv_clean_fields &
> +		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL))) {
> +		hv_vcpu->nested.pa_page_gpa = evmcs->partition_assist_page;
> +		hv_vcpu->nested.vm_id = evmcs->hv_vm_id;
> +		hv_vcpu->nested.vp_id = evmcs->hv_vp_id;
> +	}
> +
>  	if (unlikely(!(hv_clean_fields &
>  		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) {
>  		vmcs12->guest_rsp = evmcs->guest_rsp;

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky
diff mbox series

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 837c07e213de..8b2a52bf26c0 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -622,6 +622,12 @@  struct kvm_vcpu_hv {
 
 	/* Preallocated buffer for handling hypercalls passing sparse vCPU set */
 	u64 sparse_banks[64];
+
+	struct {
+		u64 pa_page_gpa;
+		u64 vm_id;
+		u32 vp_id;
+	} nested;
 };
 
 /* Xen HVM per vcpu emulation context */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index a6688663da4d..ee88921c6156 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -225,6 +225,7 @@  static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
 
 static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 {
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
 	if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
@@ -233,6 +234,12 @@  static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 	}
 
 	vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
+
+	if (hv_vcpu) {
+		hv_vcpu->nested.pa_page_gpa = INVALID_GPA;
+		hv_vcpu->nested.vm_id = 0;
+		hv_vcpu->nested.vp_id = 0;
+	}
 }
 
 static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
@@ -1591,11 +1598,19 @@  static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields
 {
 	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
 	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(&vmx->vcpu);
 
 	/* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
 	vmcs12->tpr_threshold = evmcs->tpr_threshold;
 	vmcs12->guest_rip = evmcs->guest_rip;
 
+	if (unlikely(!(hv_clean_fields &
+		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL))) {
+		hv_vcpu->nested.pa_page_gpa = evmcs->partition_assist_page;
+		hv_vcpu->nested.vm_id = evmcs->hv_vm_id;
+		hv_vcpu->nested.vp_id = evmcs->hv_vp_id;
+	}
+
 	if (unlikely(!(hv_clean_fields &
 		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) {
 		vmcs12->guest_rsp = evmcs->guest_rsp;