kvm: x86: Add exception payload fields to kvm_vcpu_events

The per-VM capability KVM_CAP_EXCEPTION_PAYLOAD (to be introduced in a
later commit) adds the following fields to struct kvm_vcpu_events:
exception_has_payload, exception_payload, and exception.pending.

With this capability set, all of the details of vcpu->arch.exception,
including the payload for a pending exception, are reported to
userspace in response to KVM_GET_VCPU_EVENTS.

With this capability clear, the original ABI is preserved, and the
exception.injected field is set for either pending or injected
exceptions.

When userspace calls KVM_SET_VCPU_EVENTS with
KVM_CAP_EXCEPTION_PAYLOAD clear, exception.injected is no longer
translated to exception.pending. KVM_SET_VCPU_EVENTS can now only
establish a pending exception when KVM_CAP_EXCEPTION_PAYLOAD is set.

Reported-by: Jim Mattson <jmattson@google.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index cf9422f..e900ac3 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -850,7 +850,7 @@ struct kvm_vcpu_events {
                __u8 injected;
                __u8 nr;
                __u8 has_error_code;
-               __u8 pad;
+               __u8 pending;
                __u32 error_code;
        } exception;
        struct {
@@ -873,16 +873,23 @@ struct kvm_vcpu_events {
                __u8 smm_inside_nmi;
                __u8 latched_init;
        } smi;
-       __u32 reserved[9];
+       __u8 reserved[27];
+       __u8 exception_has_payload;
+       __u64 exception_payload;
 };
 
-Only two fields are defined in the flags field:
+The following bits are defined in the flags field:
 
-- KVM_VCPUEVENT_VALID_SHADOW may be set in the flags field to signal that
+- KVM_VCPUEVENT_VALID_SHADOW may be set to signal that
   interrupt.shadow contains a valid state.
 
-- KVM_VCPUEVENT_VALID_SMM may be set in the flags field to signal that
-  smi contains a valid state.
+- KVM_VCPUEVENT_VALID_SMM may be set to signal that smi contains a
+  valid state.
+
+- KVM_VCPUEVENT_VALID_PAYLOAD may be set to signal that the
+  exception_has_payload, exception_payload, and exception.pending
+  fields contain a valid state. This bit will be set whenever
+  KVM_CAP_EXCEPTION_PAYLOAD is enabled.
 
 ARM/ARM64:
 
@@ -962,6 +969,11 @@ shall be written into the VCPU.
 
 KVM_VCPUEVENT_VALID_SMM can only be set if KVM_CAP_X86_SMM is available.
 
+If KVM_CAP_EXCEPTION_PAYLOAD is enabled, KVM_VCPUEVENT_VALID_PAYLOAD
+can be set in the flags field to signal that the
+exception_has_payload, exception_payload, and exception.pending fields
+contain a valid state and shall be written into the VCPU.
+
 ARM/ARM64:
 
 Set the pending SError exception state for this VCPU. It is not possible to

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 20f7c99..55e51ff 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -919,6 +919,7 @@ struct kvm_arch {
        bool x2apic_broadcast_quirk_disabled;
 
        bool guest_can_read_msr_platform_info;
+       bool exception_payload_enabled;
 };
 
 struct kvm_vm_stat {

diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index ab76aa1..dabfcf7 100644 (file)
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -288,6 +288,7 @@ struct kvm_reinject_control {
 #define KVM_VCPUEVENT_VALID_SIPI_VECTOR        0x00000002
 #define KVM_VCPUEVENT_VALID_SHADOW     0x00000004
 #define KVM_VCPUEVENT_VALID_SMM                0x00000008
+#define KVM_VCPUEVENT_VALID_PAYLOAD    0x00000010
 
 /* Interrupt shadow states */
 #define KVM_X86_SHADOW_INT_MOV_SS      0x01
@@ -299,7 +300,7 @@ struct kvm_vcpu_events {
                __u8 injected;
                __u8 nr;
                __u8 has_error_code;
-               __u8 pad;
+               __u8 pending;
                __u32 error_code;
        } exception;
        struct {
@@ -322,7 +323,9 @@ struct kvm_vcpu_events {
                __u8 smm_inside_nmi;
                __u8 latched_init;
        } smi;
-       __u32 reserved[9];
+       __u8 reserved[27];
+       __u8 exception_has_payload;
+       __u64 exception_payload;
 };
 
 /* for KVM_GET/SET_DEBUGREGS */

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 532b660..2ef7065 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3373,19 +3373,33 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
                                               struct kvm_vcpu_events *events)
 {
        process_nmi(vcpu);
+
        /*
-        * FIXME: pass injected and pending separately.  This is only
-        * needed for nested virtualization, whose state cannot be
-        * migrated yet.  For now we can combine them.
+        * The API doesn't provide the instruction length for software
+        * exceptions, so don't report them. As long as the guest RIP
+        * isn't advanced, we should expect to encounter the exception
+        * again.
         */
-       events->exception.injected =
-               (vcpu->arch.exception.pending ||
-                vcpu->arch.exception.injected) &&
-               !kvm_exception_is_soft(vcpu->arch.exception.nr);
+       if (kvm_exception_is_soft(vcpu->arch.exception.nr)) {
+               events->exception.injected = 0;
+               events->exception.pending = 0;
+       } else {
+               events->exception.injected = vcpu->arch.exception.injected;
+               events->exception.pending = vcpu->arch.exception.pending;
+               /*
+                * For ABI compatibility, deliberately conflate
+                * pending and injected exceptions when
+                * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled.
+                */
+               if (!vcpu->kvm->arch.exception_payload_enabled)
+                       events->exception.injected |=
+                               vcpu->arch.exception.pending;
+       }
        events->exception.nr = vcpu->arch.exception.nr;
        events->exception.has_error_code = vcpu->arch.exception.has_error_code;
-       events->exception.pad = 0;
        events->exception.error_code = vcpu->arch.exception.error_code;
+       events->exception_has_payload = vcpu->arch.exception.has_payload;
+       events->exception_payload = vcpu->arch.exception.payload;
 
        events->interrupt.injected =
                vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft;
@@ -3409,6 +3423,9 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
        events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
                         | KVM_VCPUEVENT_VALID_SHADOW
                         | KVM_VCPUEVENT_VALID_SMM);
+       if (vcpu->kvm->arch.exception_payload_enabled)
+               events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD;
+
        memset(&events->reserved, 0, sizeof(events->reserved));
 }
 
@@ -3420,12 +3437,24 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
        if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
                              | KVM_VCPUEVENT_VALID_SIPI_VECTOR
                              | KVM_VCPUEVENT_VALID_SHADOW
-                             | KVM_VCPUEVENT_VALID_SMM))
+                             | KVM_VCPUEVENT_VALID_SMM
+                             | KVM_VCPUEVENT_VALID_PAYLOAD))
                return -EINVAL;
 
-       if (events->exception.injected &&
-           (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR ||
-            is_guest_mode(vcpu)))
+       if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) {
+               if (!vcpu->kvm->arch.exception_payload_enabled)
+                       return -EINVAL;
+               if (events->exception.pending)
+                       events->exception.injected = 0;
+               else
+                       events->exception_has_payload = 0;
+       } else {
+               events->exception.pending = 0;
+               events->exception_has_payload = 0;
+       }
+
+       if ((events->exception.injected || events->exception.pending) &&
+           (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR))
                return -EINVAL;
 
        /* INITs are latched while in SMM */
@@ -3435,13 +3464,13 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
                return -EINVAL;
 
        process_nmi(vcpu);
-       vcpu->arch.exception.injected = false;
-       vcpu->arch.exception.pending = events->exception.injected;
+       vcpu->arch.exception.injected = events->exception.injected;
+       vcpu->arch.exception.pending = events->exception.pending;
        vcpu->arch.exception.nr = events->exception.nr;
        vcpu->arch.exception.has_error_code = events->exception.has_error_code;
        vcpu->arch.exception.error_code = events->exception.error_code;
-       vcpu->arch.exception.has_payload = false;
-       vcpu->arch.exception.payload = 0;
+       vcpu->arch.exception.has_payload = events->exception_has_payload;
+       vcpu->arch.exception.payload = events->exception_payload;
 
        vcpu->arch.interrupt.injected = events->interrupt.injected;
        vcpu->arch.interrupt.nr = events->interrupt.nr;

diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h
index 86299ef..b09875f 100644 (file)
--- a/tools/arch/x86/include/uapi/asm/kvm.h
+++ b/tools/arch/x86/include/uapi/asm/kvm.h
@@ -288,6 +288,7 @@ struct kvm_reinject_control {
 #define KVM_VCPUEVENT_VALID_SIPI_VECTOR        0x00000002
 #define KVM_VCPUEVENT_VALID_SHADOW     0x00000004
 #define KVM_VCPUEVENT_VALID_SMM                0x00000008
+#define KVM_VCPUEVENT_VALID_PAYLOAD    0x00000010
 
 /* Interrupt shadow states */
 #define KVM_X86_SHADOW_INT_MOV_SS      0x01
@@ -299,7 +300,10 @@ struct kvm_vcpu_events {
                __u8 injected;
                __u8 nr;
                __u8 has_error_code;
-               __u8 pad;
+               union {
+                       __u8 pad;
+                       __u8 pending;
+               };
                __u32 error_code;
        } exception;
        struct {
@@ -322,7 +326,9 @@ struct kvm_vcpu_events {
                __u8 smm_inside_nmi;
                __u8 latched_init;
        } smi;
-       __u32 reserved[9];
+       __u8 reserved[27];
+       __u8 exception_has_payload;
+       __u64 exception_payload;
 };
 
 /* for KVM_GET/SET_DEBUGREGS */