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From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: kvm@vger.kernel.org
Cc: "Adalbert Lazăr" <alazar@bitdefender.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Ștefan Șicleru" <ssicleru@bitdefender.com>,
	virtualization@lists.linux-foundation.org
Subject: [RFC PATCH v1 18/34] KVM: introspection: extend KVMI_VM_SET_PAGE_ACCESS with EPT view info
Date: Wed, 22 Jul 2020 19:01:05 +0300
Message-ID: <20200722160121.9601-19-alazar@bitdefender.com> (raw)
In-Reply-To: <20200722160121.9601-1-alazar@bitdefender.com>

From: Ștefan Șicleru <ssicleru@bitdefender.com>

The introspection tool uses this command to set distinct access rights
on different EPT views.

Signed-off-by: Ștefan Șicleru <ssicleru@bitdefender.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 Documentation/virt/kvm/kvmi.rst |  8 +++++---
 include/uapi/linux/kvmi.h       |  4 ++--
 virt/kvm/introspection/kvmi.c   | 10 ++++++++--
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index f4c60aba9b53..658c9df01469 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -1003,8 +1003,8 @@ to control events for any other register will fail with -KVM_EINVAL::
 
 	struct kvmi_vm_set_page_access {
 		__u16 count;
-		__u16 padding1;
-		__u32 padding2;
+		__u16 view;
+		__u32 padding;
 		struct kvmi_page_access_entry entries[0];
 	};
 
@@ -1026,7 +1026,7 @@ where::
 	struct kvmi_error_code
 
 Sets the access bits (rwx) for an array of ``count`` guest physical
-addresses.
+addresses, for the selected view.
 
 The valid access bits are::
 
@@ -1048,7 +1048,9 @@ In order to 'forget' an address, all three bits ('rwx') must be set.
 
 * -KVM_EINVAL - the specified access bits combination is invalid
 * -KVM_EINVAL - the padding is not zero
+* -KVM_EINVAL - the selected EPT view is invalid
 * -KVM_EINVAL - the message size is invalid
+* -KVM_EOPNOTSUPP - an EPT view was selected but the hardware doesn't support it
 * -KVM_EAGAIN - the selected vCPU can't be introspected yet
 * -KVM_ENOMEM - there is not enough memory to add the page tracking structures
 
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index a72c536a2c80..505a865cd115 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -191,8 +191,8 @@ struct kvmi_page_access_entry {
 
 struct kvmi_vm_set_page_access {
 	__u16 count;
-	__u16 padding1;
-	__u32 padding2;
+	__u16 view;
+	__u32 padding;
 	struct kvmi_page_access_entry entries[0];
 };
 
diff --git a/virt/kvm/introspection/kvmi.c b/virt/kvm/introspection/kvmi.c
index 737fe3c7a956..44b0092e304f 100644
--- a/virt/kvm/introspection/kvmi.c
+++ b/virt/kvm/introspection/kvmi.c
@@ -1187,14 +1187,20 @@ int kvmi_cmd_set_page_access(struct kvm_introspection *kvmi,
 	const struct kvmi_page_access_entry *end = req->entries + req->count;
 	int ec = 0;
 
-	if (req->padding1 || req->padding2)
+	if (req->padding)
 		return -KVM_EINVAL;
 
 	if (msg->size < struct_size(req, entries, req->count))
 		return -KVM_EINVAL;
 
+	if (!is_valid_view(req->view))
+		return -KVM_EINVAL;
+
+	if (req->view != 0 && !kvm_eptp_switching_supported)
+		return -KVM_EOPNOTSUPP;
+
 	for (; entry < end; entry++) {
-		int r = set_page_access_entry(kvmi, 0, entry);
+		int r = set_page_access_entry(kvmi, req->view, entry);
 
 		if (r && !ec)
 			ec = r;
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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 ` [RFC PATCH v1 09/34] KVM: x86: add .control_ept_view() Adalbert Lazăr
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 ` Adalbert Lazăr [this message]
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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