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-rw-r--r--Documentation/virtual/kvm/api.txt24
-rw-r--r--arch/x86/include/asm/kvm_host.h1
-rw-r--r--arch/x86/include/uapi/asm/kvm.h7
-rw-r--r--arch/x86/kvm/x86.c61
-rw-r--r--tools/arch/x86/include/uapi/asm/kvm.h10
5 files changed, 77 insertions, 26 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index cf9422f4f101..e900ac31501c 100644
--- 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 20f7c994afeb..55e51ff7e421 100644
--- 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 ab76aa1d3a4d..dabfcf7c3941 100644
--- 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 532b660fe497..2ef706574589 100644
--- 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 86299efa804a..b09875f580d5 100644
--- 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 */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.