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From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: kvm@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Ștefan Șicleru" <ssicleru@bitdefender.com>,
	"Adalbert Lazăr" <alazar@bitdefender.com>
Subject: [RFC PATCH v1 09/34] KVM: x86: add .control_ept_view()
Date: Wed, 22 Jul 2020 19:00:56 +0300
Message-ID: <20200722160121.9601-10-alazar@bitdefender.com> (raw)
In-Reply-To: <20200722160121.9601-1-alazar@bitdefender.com>

From: Ștefan Șicleru <ssicleru@bitdefender.com>

This will be used by the introspection tool to control the EPT views to
which the guest is allowed to switch.

Signed-off-by: Ștefan Șicleru <ssicleru@bitdefender.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/include/asm/kvm_host.h |  1 +
 arch/x86/kvm/vmx/vmx.c          | 18 +++++++++++++++++-
 arch/x86/kvm/vmx/vmx.h          |  2 ++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 300f7fc43987..5e241863153f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1310,6 +1310,7 @@ struct kvm_x86_ops {
 	bool (*get_eptp_switching_status)(void);
 	u16 (*get_ept_view)(struct kvm_vcpu *vcpu);
 	int (*set_ept_view)(struct kvm_vcpu *vcpu, u16 view);
+	int (*control_ept_view)(struct kvm_vcpu *vcpu, u16 view, u8 visible);
 };
 
 struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 0d39487ce5c6..cbc943d217e3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3138,8 +3138,11 @@ static void vmx_construct_eptp_with_index(struct kvm_vcpu *vcpu,
 	if (!eptp_list)
 		return;
 
-	eptp_list[view] = construct_eptp(vcpu,
+	if (test_bit(view, &vmx->allowed_views))
+		eptp_list[view] = construct_eptp(vcpu,
 				vcpu->arch.mmu->root_hpa_altviews[view]);
+	else
+		eptp_list[view] = (~0ULL);
 }
 
 static void vmx_construct_eptp_list(struct kvm_vcpu *vcpu)
@@ -4395,6 +4398,18 @@ static int vmx_set_ept_view(struct kvm_vcpu *vcpu, u16 view)
 	return 0;
 }
 
+static int vmx_control_ept_view(struct kvm_vcpu *vcpu, u16 view, u8 visible)
+{
+	if (visible)
+		set_bit(view, &to_vmx(vcpu)->allowed_views);
+	else
+		clear_bit(view, &to_vmx(vcpu)->allowed_views);
+
+	vmx_construct_eptp_with_index(vcpu, view);
+
+	return 0;
+}
+
 #define VMX_XSS_EXIT_BITMAP 0
 
 /*
@@ -8284,6 +8299,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.get_eptp_switching_status = vmx_get_eptp_switching_status,
 	.get_ept_view = vmx_get_ept_view,
 	.set_ept_view = vmx_set_ept_view,
+	.control_ept_view = vmx_control_ept_view,
 };
 
 static __init int hardware_setup(void)
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 4e2f86458ca2..38d50fc7357b 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -300,6 +300,8 @@ struct vcpu_vmx {
 	struct page *eptp_list_pg;
 	/* The view this vcpu operates on. */
 	u16 view;
+	/* Visible EPT views bitmap for in-guest VMFUNC. */
+	unsigned long allowed_views;
 };
 
 enum ept_pointers_status {

  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22 16:00 [RFC PATCH v1 00/34] VM introspection - EPT Views and Virtualization Exceptions Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 01/34] KVM: x86: export .get_vmfunc_status() Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 02/34] KVM: x86: export .get_eptp_switching_status() Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 03/34] KVM: x86: add kvm_get_ept_view() Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 04/34] KVM: x86: mmu: reindent to avoid lines longer than 80 chars Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 05/34] KVM: x86: mmu: add EPT view parameter to kvm_mmu_get_page() Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 06/34] KVM: x86: mmu: add support for EPT switching Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 07/34] KVM: x86: mmu: increase mmu_memory_cache size Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 08/34] KVM: x86: add .set_ept_view() Adalbert Lazăr
2020-07-22 16:00 ` Adalbert Lazăr [this message]
2020-07-22 16:00 ` [RFC PATCH v1 10/34] KVM: x86: page track: allow page tracking for different EPT views Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 11/34] KVM: x86: mmu: allow zapping shadow pages for specific " Adalbert Lazăr
2020-07-22 16:00 ` [RFC PATCH v1 12/34] KVM: introspection: extend struct kvmi_features with the EPT views status support Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 13/34] KVM: introspection: add KVMI_VCPU_GET_EPT_VIEW Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 14/34] KVM: introspection: add 'view' field to struct kvmi_event_arch Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 15/34] KVM: introspection: add KVMI_VCPU_SET_EPT_VIEW Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 16/34] KVM: introspection: add KVMI_VCPU_CONTROL_EPT_VIEW Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 17/34] KVM: introspection: extend the access rights database with EPT view info Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 18/34] KVM: introspection: extend KVMI_VM_SET_PAGE_ACCESS " Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 19/34] KVM: introspection: clean non-default EPTs on unhook Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 20/34] KVM: x86: vmx: add support for virtualization exceptions Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 21/34] KVM: VMX: Define EPT suppress #VE bit (bit 63 in EPT leaf entries) Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 22/34] KVM: VMX: Suppress EPT violation #VE by default (when enabled) Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 23/34] KVM: x86: mmu: fix: update present_mask in spte_read_protect() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 24/34] KVM: vmx: trigger vm-exits for mmio sptes by default when #VE is enabled Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 25/34] KVM: x86: svm: set .clear_page() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 26/34] KVM: x86: add .set_ve_info() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 27/34] KVM: x86: add .disable_ve() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 28/34] KVM: x86: page_track: add support for suppress #VE bit Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 29/34] KVM: vmx: make use of EPTP_INDEX in vmx_handle_exit() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 30/34] KVM: vmx: make use of EPTP_INDEX in vmx_set_ept_view() Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 31/34] KVM: introspection: add #VE host capability checker Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 32/34] KVM: introspection: add KVMI_VCPU_SET_VE_INFO/KVMI_VCPU_DISABLE_VE Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 33/34] KVM: introspection: mask out non-rwx flags when reading/writing from/to the internal database Adalbert Lazăr
2020-07-22 16:01 ` [RFC PATCH v1 34/34] KVM: introspection: add KVMI_VM_SET_PAGE_SVE Adalbert Lazăr

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