From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: kvm@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Sean Christopherson" <seanjc@google.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Jim Mattson" <jmattson@google.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Mathieu Tarral" <mathieu.tarral@protonmail.com>,
"Tamas K Lengyel" <tamas@tklengyel.com>,
"Nicușor Cîțu" <nicu.citu@icloud.com>,
"Adalbert Lazăr" <alazar@bitdefender.com>
Subject: [PATCH v12 59/77] KVM: introspection: restore the state of CR3 interception on unhook
Date: Wed, 6 Oct 2021 20:30:55 +0300 [thread overview]
Message-ID: <20211006173113.26445-60-alazar@bitdefender.com> (raw)
In-Reply-To: <20211006173113.26445-1-alazar@bitdefender.com>
From: Nicușor Cîțu <nicu.citu@icloud.com>
This commit also ensures that the introspection tool and the userspace
do not disable each other the CR3-write VM-exit.
Signed-off-by: Nicușor Cîțu <nicu.citu@icloud.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
arch/x86/include/asm/kvmi_host.h | 4 ++
arch/x86/kvm/kvmi.c | 68 +++++++++++++++++++++++++++++---
arch/x86/kvm/kvmi.h | 4 +-
arch/x86/kvm/kvmi_msg.c | 4 +-
arch/x86/kvm/svm/svm.c | 5 +++
arch/x86/kvm/vmx/vmx.c | 5 +++
6 files changed, 81 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/kvmi_host.h b/arch/x86/include/asm/kvmi_host.h
index 7613088d0ae2..edbedf031467 100644
--- a/arch/x86/include/asm/kvmi_host.h
+++ b/arch/x86/include/asm/kvmi_host.h
@@ -16,6 +16,7 @@ struct kvmi_interception {
bool cleanup;
bool restore_interception;
struct kvmi_monitor_interception breakpoint;
+ struct kvmi_monitor_interception cr3w;
};
struct kvm_vcpu_arch_introspection {
@@ -34,6 +35,7 @@ bool kvmi_monitor_bp_intercept(struct kvm_vcpu *vcpu, u32 dbg);
bool kvmi_cr_event(struct kvm_vcpu *vcpu, unsigned int cr,
unsigned long old_value, unsigned long *new_value);
bool kvmi_cr3_intercepted(struct kvm_vcpu *vcpu);
+bool kvmi_monitor_cr3w_intercept(struct kvm_vcpu *vcpu, bool enable);
#else /* CONFIG_KVM_INTROSPECTION */
@@ -44,6 +46,8 @@ static inline bool kvmi_cr_event(struct kvm_vcpu *vcpu, unsigned int cr,
unsigned long *new_value)
{ return true; }
static inline bool kvmi_cr3_intercepted(struct kvm_vcpu *vcpu) { return false; }
+static inline bool kvmi_monitor_cr3w_intercept(struct kvm_vcpu *vcpu,
+ bool enable) { return false; }
#endif /* CONFIG_KVM_INTROSPECTION */
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index 31a11c7120c5..acd655ab770d 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -230,6 +230,59 @@ static void kvmi_arch_disable_bp_intercept(struct kvm_vcpu *vcpu)
vcpu->arch.kvmi->breakpoint.kvm_intercepted = false;
}
+static bool monitor_cr3w_fct_kvmi(struct kvm_vcpu *vcpu, bool enable)
+{
+ vcpu->arch.kvmi->cr3w.kvmi_intercepted = enable;
+
+ if (enable)
+ vcpu->arch.kvmi->cr3w.kvm_intercepted =
+ static_call(kvm_x86_cr3_write_intercepted)(vcpu);
+ else if (vcpu->arch.kvmi->cr3w.kvm_intercepted)
+ return true;
+
+ return false;
+}
+
+static bool monitor_cr3w_fct_kvm(struct kvm_vcpu *vcpu, bool enable)
+{
+ if (!vcpu->arch.kvmi->cr3w.kvmi_intercepted)
+ return false;
+
+ vcpu->arch.kvmi->cr3w.kvm_intercepted = enable;
+
+ if (!enable)
+ return true;
+
+ return false;
+}
+
+/*
+ * Returns true if one side (kvm or kvmi) tries to disable the CR3 write
+ * interception while the other side is still tracking it.
+ */
+bool kvmi_monitor_cr3w_intercept(struct kvm_vcpu *vcpu, bool enable)
+{
+ struct kvmi_interception *arch_vcpui = READ_ONCE(vcpu->arch.kvmi);
+
+ return (arch_vcpui && arch_vcpui->cr3w.monitor_fct(vcpu, enable));
+}
+EXPORT_SYMBOL(kvmi_monitor_cr3w_intercept);
+
+static void kvmi_control_cr3w_intercept(struct kvm_vcpu *vcpu, bool enable)
+{
+ vcpu->arch.kvmi->cr3w.monitor_fct = monitor_cr3w_fct_kvmi;
+ static_call(kvm_x86_control_cr3_intercept)(vcpu, CR_TYPE_W, enable);
+ vcpu->arch.kvmi->cr3w.monitor_fct = monitor_cr3w_fct_kvm;
+}
+
+static void kvmi_arch_disable_cr3w_intercept(struct kvm_vcpu *vcpu)
+{
+ kvmi_control_cr3w_intercept(vcpu, false);
+
+ vcpu->arch.kvmi->cr3w.kvmi_intercepted = false;
+ vcpu->arch.kvmi->cr3w.kvm_intercepted = false;
+}
+
int kvmi_arch_cmd_control_intercept(struct kvm_vcpu *vcpu,
unsigned int event_id, bool enable)
{
@@ -269,6 +322,7 @@ void kvmi_arch_breakpoint_event(struct kvm_vcpu *vcpu, u64 gva, u8 insn_len)
static void kvmi_arch_restore_interception(struct kvm_vcpu *vcpu)
{
kvmi_arch_disable_bp_intercept(vcpu);
+ kvmi_arch_disable_cr3w_intercept(vcpu);
}
bool kvmi_arch_clean_up_interception(struct kvm_vcpu *vcpu)
@@ -293,8 +347,13 @@ bool kvmi_arch_vcpu_alloc_interception(struct kvm_vcpu *vcpu)
return false;
arch_vcpui->breakpoint.monitor_fct = monitor_bp_fct_kvm;
+ arch_vcpui->cr3w.monitor_fct = monitor_cr3w_fct_kvm;
- /* pair with kvmi_monitor_bp_intercept() */
+ /*
+ * paired with:
+ * - kvmi_monitor_bp_intercept()
+ * - kvmi_monitor_cr3w_intercept()
+ */
smp_wmb();
WRITE_ONCE(vcpu->arch.kvmi, arch_vcpui);
@@ -326,8 +385,7 @@ void kvmi_arch_request_interception_cleanup(struct kvm_vcpu *vcpu,
int kvmi_arch_cmd_vcpu_control_cr(struct kvm_vcpu *vcpu, int cr, bool enable)
{
if (cr == 3)
- static_call(kvm_x86_control_cr3_intercept)(vcpu, CR_TYPE_W,
- enable);
+ kvmi_control_cr3w_intercept(vcpu, enable);
if (enable)
set_bit(cr, VCPUI(vcpu)->arch.cr_mask);
@@ -347,8 +405,8 @@ static bool __kvmi_cr_event(struct kvm_vcpu *vcpu, unsigned int cr,
if (!test_bit(cr, VCPUI(vcpu)->arch.cr_mask))
return true;
- action = kvmi_msg_send_cr(vcpu, cr, old_value, *new_value,
- &reply_value);
+ action = kvmi_msg_send_vcpu_cr(vcpu, cr, old_value, *new_value,
+ &reply_value);
switch (action) {
case KVMI_EVENT_ACTION_CONTINUE:
*new_value = reply_value;
diff --git a/arch/x86/kvm/kvmi.h b/arch/x86/kvm/kvmi.h
index 6f4aaebb67f9..6a444428b831 100644
--- a/arch/x86/kvm/kvmi.h
+++ b/arch/x86/kvm/kvmi.h
@@ -9,7 +9,7 @@ void kvmi_arch_cmd_vcpu_set_registers(struct kvm_vcpu *vcpu,
const struct kvm_regs *regs);
int kvmi_arch_cmd_vcpu_control_cr(struct kvm_vcpu *vcpu, int cr, bool enable);
-u32 kvmi_msg_send_cr(struct kvm_vcpu *vcpu, u32 cr, u64 old_value,
- u64 new_value, u64 *ret_value);
+u32 kvmi_msg_send_vcpu_cr(struct kvm_vcpu *vcpu, u32 cr, u64 old_value,
+ u64 new_value, u64 *ret_value);
#endif
diff --git a/arch/x86/kvm/kvmi_msg.c b/arch/x86/kvm/kvmi_msg.c
index 200d68febc84..4a2dbc38aef8 100644
--- a/arch/x86/kvm/kvmi_msg.c
+++ b/arch/x86/kvm/kvmi_msg.c
@@ -166,8 +166,8 @@ kvmi_vcpu_msg_job_fct kvmi_arch_vcpu_msg_handler(u16 id)
return id < ARRAY_SIZE(msg_vcpu) ? msg_vcpu[id] : NULL;
}
-u32 kvmi_msg_send_cr(struct kvm_vcpu *vcpu, u32 cr, u64 old_value,
- u64 new_value, u64 *ret_value)
+u32 kvmi_msg_send_vcpu_cr(struct kvm_vcpu *vcpu, u32 cr, u64 old_value,
+ u64 new_value, u64 *ret_value)
{
struct kvmi_vcpu_event_cr e;
struct kvmi_vcpu_event_cr_reply r;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 84f4f59ba703..7353996907d3 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1935,6 +1935,11 @@ static void svm_control_cr3_intercept(struct kvm_vcpu *vcpu, int type,
{
struct vcpu_svm *svm = to_svm(vcpu);
+#ifdef CONFIG_KVM_INTROSPECTION
+ if ((type & CR_TYPE_W) && kvmi_monitor_cr3w_intercept(vcpu, enable))
+ type &= ~CR_TYPE_W;
+#endif /* CONFIG_KVM_INTROSPECTION */
+
if (type & CR_TYPE_R)
enable ? svm_set_intercept(svm, INTERCEPT_CR3_READ) :
svm_clr_intercept(svm, INTERCEPT_CR3_READ);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 2a838595ba0b..c268194cee84 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3011,6 +3011,11 @@ static void vmx_control_cr3_intercept(struct kvm_vcpu *vcpu, int type,
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 cr3_exec_control = 0;
+#ifdef CONFIG_KVM_INTROSPECTION
+ if ((type & CR_TYPE_W) && kvmi_monitor_cr3w_intercept(vcpu, enable))
+ type &= ~CR_TYPE_W;
+#endif /* CONFIG_KVM_INTROSPECTION */
+
if (type & CR_TYPE_R)
cr3_exec_control |= CPU_BASED_CR3_STORE_EXITING;
if (type & CR_TYPE_W)
next prev parent reply other threads:[~2021-10-06 17:42 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-06 17:29 [PATCH v12 00/77] VM introspection Adalbert Lazăr
2021-10-06 17:29 ` [PATCH v12 01/77] KVM: UAPI: add error codes used by the VM introspection code Adalbert Lazăr
2021-10-06 17:29 ` [PATCH v12 02/77] KVM: add kvm_vcpu_kick_and_wait() Adalbert Lazăr
2021-10-06 17:29 ` [PATCH v12 03/77] KVM: x86: add kvm_arch_vcpu_get_regs() and kvm_arch_vcpu_get_sregs() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 04/77] KVM: x86: add kvm_arch_vcpu_set_regs() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 05/77] KVM: x86: avoid injecting #PF when emulate the VMCALL instruction Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 06/77] KVM: x86: add kvm_x86_ops.bp_intercepted() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 07/77] KVM: x86: add kvm_x86_ops.control_cr3_intercept() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 08/77] KVM: x86: add kvm_x86_ops.cr3_write_intercepted() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 09/77] KVM: x86: add kvm_x86_ops.desc_ctrl_supported() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 10/77] KVM: svm: add support for descriptor-table VM-exits Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 11/77] KVM: x86: add kvm_x86_ops.control_desc_intercept() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 12/77] KVM: x86: add kvm_x86_ops.desc_intercepted() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 13/77] KVM: x86: add kvm_x86_ops.msr_write_intercepted() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 14/77] KVM: x86: svm: use the vmx convention to control the MSR interception Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 15/77] KVM: x86: add kvm_x86_ops.control_msr_intercept() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 16/77] KVM: x86: save the error code during EPT/NPF exits handling Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 17/77] KVM: x86: add kvm_x86_ops.fault_gla() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 18/77] KVM: x86: add kvm_x86_ops.control_singlestep() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 19/77] KVM: x86: export kvm_arch_vcpu_set_guest_debug() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 20/77] KVM: x86: extend kvm_mmu_gva_to_gpa_system() with the 'access' parameter Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 21/77] KVM: x86: export kvm_inject_pending_exception() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 22/77] KVM: x86: export kvm_vcpu_ioctl_x86_get_xsave() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 23/77] KVM: x86: export kvm_vcpu_ioctl_x86_set_xsave() Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 24/77] KVM: x86: page track: provide all callbacks with the guest virtual address Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 25/77] KVM: x86: page track: add track_create_slot() callback Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 26/77] KVM: x86: page_track: add support for preread, prewrite and preexec Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 27/77] KVM: x86: wire in the preread/prewrite/preexec page trackers Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 28/77] KVM: x86: disable gpa_available optimization for fetch and page-walk SPT violations Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 29/77] KVM: introduce VM introspection Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 30/77] KVM: introspection: add hook/unhook ioctls Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 31/77] KVM: introspection: add permission access ioctls Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 32/77] KVM: introspection: add the read/dispatch message function Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 33/77] KVM: introspection: add KVMI_GET_VERSION Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 34/77] KVM: introspection: add KVMI_VM_CHECK_COMMAND and KVMI_VM_CHECK_EVENT Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 35/77] KVM: introspection: add KVMI_VM_GET_INFO Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 36/77] KVM: introspection: add KVM_INTROSPECTION_PREUNHOOK Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 37/77] KVM: introspection: add KVMI_VM_EVENT_UNHOOK Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 38/77] KVM: introspection: add KVMI_VM_CONTROL_EVENTS Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 39/77] KVM: introspection: add KVMI_VM_READ_PHYSICAL/KVMI_VM_WRITE_PHYSICAL Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 40/77] KVM: introspection: add vCPU related data Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 41/77] KVM: introspection: add a jobs list to every introspected vCPU Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 42/77] KVM: introspection: handle vCPU introspection requests Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 43/77] KVM: introspection: handle vCPU commands Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 44/77] KVM: introspection: add KVMI_VCPU_GET_INFO Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 45/77] KVM: introspection: add KVMI_VM_PAUSE_VCPU Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 46/77] KVM: introspection: add support for vCPU events Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 47/77] KVM: introspection: add KVMI_VCPU_EVENT_PAUSE Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 48/77] KVM: introspection: add the crash action handling on the event reply Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 49/77] KVM: introspection: add KVMI_VCPU_CONTROL_EVENTS Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 50/77] KVM: introspection: add KVMI_VCPU_GET_REGISTERS Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 51/77] KVM: introspection: add KVMI_VCPU_SET_REGISTERS Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 52/77] KVM: introspection: add KVMI_VCPU_GET_CPUID Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 53/77] KVM: introspection: add KVMI_VCPU_EVENT_HYPERCALL Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 54/77] KVM: introspection: add KVMI_VCPU_EVENT_BREAKPOINT Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 55/77] KVM: introspection: add cleanup support for vCPUs Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 56/77] KVM: introspection: restore the state of #BP interception on unhook Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 57/77] KVM: introspection: add KVMI_VM_CONTROL_CLEANUP Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 58/77] KVM: introspection: add KVMI_VCPU_CONTROL_CR and KVMI_VCPU_EVENT_CR Adalbert Lazăr
2021-10-06 17:30 ` Adalbert Lazăr [this message]
2021-10-06 17:30 ` [PATCH v12 60/77] KVM: introspection: add KVMI_VCPU_INJECT_EXCEPTION + KVMI_VCPU_EVENT_TRAP Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 61/77] KVM: introspection: add KVMI_VCPU_EVENT_XSETBV Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 62/77] KVM: introspection: add KVMI_VCPU_GET_XCR Adalbert Lazăr
2021-10-06 17:30 ` [PATCH v12 63/77] KVM: introspection: add KVMI_VCPU_GET_XSAVE Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 64/77] KVM: introspection: add KVMI_VCPU_SET_XSAVE Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 65/77] KVM: introspection: add KVMI_VCPU_GET_MTRR_TYPE Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 66/77] KVM: introspection: add KVMI_VCPU_EVENT_DESCRIPTOR Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 67/77] KVM: introspection: restore the state of descriptor-table register interception on unhook Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 68/77] KVM: introspection: add KVMI_VCPU_CONTROL_MSR and KVMI_VCPU_EVENT_MSR Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 69/77] KVM: introspection: restore the state of MSR interception on unhook Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 70/77] KVM: introspection: add KVMI_VM_SET_PAGE_ACCESS Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 71/77] KVM: introspection: add KVMI_VCPU_EVENT_PF Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 72/77] KVM: introspection: extend KVMI_GET_VERSION with struct kvmi_features Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 73/77] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 74/77] KVM: introspection: add KVMI_VCPU_EVENT_SINGLESTEP Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 75/77] KVM: introspection: add KVMI_VCPU_TRANSLATE_GVA Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 76/77] KVM: introspection: emulate a guest page table walk on SPT violations due to A/D bit updates Adalbert Lazăr
2021-10-06 17:31 ` [PATCH v12 77/77] KVM: x86: call the page tracking code on emulation failure Adalbert Lazăr
2021-10-25 9:25 ` [PATCH v12 00/77] VM introspection Mathieu Tarral
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