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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>,
	"Sean Christopherson" <sean.j.christopherson@intel.com>,
	"Adalbert Lazăr" <alazar@bitdefender.com>
Subject: [RFC PATCH v1 21/34] KVM: VMX: Define EPT suppress #VE bit (bit 63 in EPT leaf entries)
Date: Wed, 22 Jul 2020 19:01:08 +0300
Message-ID: <20200722160121.9601-22-alazar@bitdefender.com> (raw)
In-Reply-To: <20200722160121.9601-1-alazar@bitdefender.com>

From: Sean Christopherson <sean.j.christopherson@intel.com>

VMX provides a capability that allows EPT violations to be reflected
into the guest as Virtualization Exceptions (#VE).  The primary use case
of EPT violation #VEs is to improve the performance of virtualization-
based security solutions, e.g. eliminate a VM-Exit -> VM-Exit roundtrip
when utilizing EPT to protect priveleged data structures or code.

The "Suppress #VE" bit allows a VMM to opt-out of EPT violation #VEs on
a per page basis, e.g. when a page is marked not-present due to lazy
installation or is write-protected for dirty page logging.

The "Suppress #VE" bit is ignored:

  - By hardware that does not support EPT violation #VEs
  - When the EPT violation #VE VMCS control is disabled
  - On non-leaf EPT entries

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/include/asm/vmx.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 177500e9e68c..8082158e3e96 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -498,6 +498,7 @@ enum vmcs_field {
 #define VMX_EPT_IPAT_BIT    			(1ull << 6)
 #define VMX_EPT_ACCESS_BIT			(1ull << 8)
 #define VMX_EPT_DIRTY_BIT			(1ull << 9)
+#define VMX_EPT_SUPPRESS_VE_BIT			(1ull << 63)
 #define VMX_EPT_RWX_MASK                        (VMX_EPT_READABLE_MASK |       \
 						 VMX_EPT_WRITABLE_MASK |       \
 						 VMX_EPT_EXECUTABLE_MASK)

  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 ` [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 ` [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 ` Adalbert Lazăr [this message]
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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