From: Nikita Leshenko <nikita.leshchenko@oracle.com>
To: kvm@vger.kernel.org
Cc: Nikita Leshenko <nikita.leshchenko@oracle.com>,
Liran Alon <liran.alon@oracle.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>
Subject: [PATCH 2/2] KVM: nVMX: Check guest activity state on vmentry of nested guests
Date: Tue, 20 Aug 2019 00:46:50 +0300 [thread overview]
Message-ID: <20190819214650.41991-3-nikita.leshchenko@oracle.com> (raw)
In-Reply-To: <20190819214650.41991-1-nikita.leshchenko@oracle.com>
The checks are written in the same order and structure as they appear in "SDM
26.3.1.5 - Checks on Guest Non-Register State", to ease verification.
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
---
arch/x86/kvm/vmx/nested.c | 24 ++++++++++++++++++++++++
arch/x86/kvm/vmx/vmcs.h | 13 +++++++++++++
2 files changed, 37 insertions(+)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 24734946ec75..e2ee217f8ffe 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2666,10 +2666,34 @@ static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
*/
static int nested_check_guest_non_reg_state(struct vmcs12 *vmcs12)
{
+ /* Activity state must contain supported value */
if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT)
return -EINVAL;
+ /* Must not be HLT if SS DPL is not 0 */
+ if (VMX_AR_DPL(vmcs12->guest_ss_ar_bytes) != 0 &&
+ vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT)
+ return -EINVAL;
+
+ /* Must be active if blocking by MOV-SS or STI */
+ if ((vmcs12->guest_interruptibility_info &
+ (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI)) &&
+ vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE)
+ return -EINVAL;
+
+ /* In HLT, only some interruptions are allowed */
+ if (vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK &&
+ vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT) {
+ u32 intr_info = vmcs12->vm_entry_intr_info_field;
+ if (!is_ext_interrupt(intr_info) &&
+ !is_nmi(intr_info) &&
+ !is_debug(intr_info) &&
+ !is_machine_check(intr_info) &&
+ !is_mtf(intr_info))
+ return -EINVAL;
+ }
+
return 0;
}
diff --git a/arch/x86/kvm/vmx/vmcs.h b/arch/x86/kvm/vmx/vmcs.h
index cb6079f8a227..c5577c40b19d 100644
--- a/arch/x86/kvm/vmx/vmcs.h
+++ b/arch/x86/kvm/vmx/vmcs.h
@@ -102,6 +102,13 @@ static inline bool is_machine_check(u32 intr_info)
(INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
}
+static inline bool is_mtf(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
+ INTR_INFO_VALID_MASK)) ==
+ (INTR_TYPE_OTHER_EVENT | 0 | INTR_INFO_VALID_MASK);
+}
+
/* Undocumented: icebp/int1 */
static inline bool is_icebp(u32 intr_info)
{
@@ -115,6 +122,12 @@ static inline bool is_nmi(u32 intr_info)
== (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK);
}
+static inline bool is_ext_interrupt(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
+ == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
+}
+
enum vmcs_field_width {
VMCS_FIELD_WIDTH_U16 = 0,
VMCS_FIELD_WIDTH_U64 = 1,
--
2.20.1
next prev parent reply other threads:[~2019-08-19 21:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 21:46 [PATCH 0/2] KVM: nVMX: Improve HLT activity support Nikita Leshenko
2019-08-19 21:46 ` [PATCH 1/2] KVM: nVMX: Always indicate HLT activity support in VMX_MISC MSR Nikita Leshenko
2019-08-19 22:11 ` Sean Christopherson
2019-08-21 20:59 ` Jim Mattson
2019-08-21 22:22 ` Sean Christopherson
2019-08-21 23:01 ` Jim Mattson
2019-08-21 23:20 ` Sean Christopherson
2019-08-26 11:30 ` Nikita Leshenko
2019-08-22 17:58 ` Jim Mattson
2019-08-19 21:46 ` Nikita Leshenko [this message]
2019-08-19 22:44 ` [PATCH 2/2] KVM: nVMX: Check guest activity state on vmentry of nested guests Liran Alon
2019-08-19 23:35 ` Sean Christopherson
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