MFC 261638,262144,262506,266765:

Add virtualized XSAVE support to bhyve which permits guests to use XSAVE and
XSAVE-enabled features like AVX.
- Store a per-cpu guest xcr0 register and handle xsetbv VM exits by emulating
  the instruction.
- Only expose XSAVE to guests if XSAVE is enabled in the host.  Only expose
  a subset of XSAVE features currently supported by the guest and for which
  the proper emulation of xsetbv is known.  Currently this includes X87, SSE,
  AVX, AVX-512, and Intel MPX.
- Add support for injecting hardware exceptions into the guest and use this
  to trigger exceptions in the guest for invalid xsetbv operations instead
  of potentially faulting in the host.
- Queue pending exceptions in the 'struct vcpu' instead of directly updating
  the processor-specific VMCS or VMCB. The pending exception will be delivered
  right before entering the guest.
- Rename the unused ioctl VM_INJECT_EVENT to VM_INJECT_EXCEPTION and restrict
  it to only deliver x86 hardware exceptions. This new ioctl is now used to
  inject a protection fault when the guest accesses an unimplemented MSR.
- Expose a subset of known-safe features from leaf 0 of the structured
  extended features to guests if they are supported on the host including
  RDFSBASE/RDGSBASE, BMI1/2, AVX2, AVX-512, HLE, ERMS, and RTM.  Aside
  from AVX-512, these features are all new instructions available for use
  in ring 3 with no additional hypervisor changes needed.

2 files changed, 15 insertions, 20 deletions

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index eba3367..7198c99 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -343,35 +343,32 @@ vm_run(struct vmctx *ctx, int vcpu, uint64_t rip, struct vm_exit *vmexit)
 }
 
 static int
-vm_inject_event_real(struct vmctx *ctx, int vcpu, enum vm_event_type type,
-		     int vector, int error_code, int error_code_valid)
+vm_inject_exception_real(struct vmctx *ctx, int vcpu, int vector,
+    int error_code, int error_code_valid)
 {
-	struct vm_event ev;
+	struct vm_exception exc;
 
-	bzero(&ev, sizeof(ev));
-	ev.cpuid = vcpu;
-	ev.type = type;
-	ev.vector = vector;
-	ev.error_code = error_code;
-	ev.error_code_valid = error_code_valid;
+	bzero(&exc, sizeof(exc));
+	exc.cpuid = vcpu;
+	exc.vector = vector;
+	exc.error_code = error_code;
+	exc.error_code_valid = error_code_valid;
 
-	return (ioctl(ctx->fd, VM_INJECT_EVENT, &ev));
+	return (ioctl(ctx->fd, VM_INJECT_EXCEPTION, &exc));
 }
 
 int
-vm_inject_event(struct vmctx *ctx, int vcpu, enum vm_event_type type,
-		int vector)
+vm_inject_exception(struct vmctx *ctx, int vcpu, int vector)
 {
 
-	return (vm_inject_event_real(ctx, vcpu, type, vector, 0, 0));
+	return (vm_inject_exception_real(ctx, vcpu, vector, 0, 0));
 }
 
 int
-vm_inject_event2(struct vmctx *ctx, int vcpu, enum vm_event_type type,
-		 int vector, int error_code)
+vm_inject_exception2(struct vmctx *ctx, int vcpu, int vector, int errcode)
 {
 
-	return (vm_inject_event_real(ctx, vcpu, type, vector, error_code, 1));
+	return (vm_inject_exception_real(ctx, vcpu, vector, errcode, 1));
 }
 
 int
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
index 4a3db5d..dcb5a98 100644
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -62,10 +62,8 @@ int	vm_get_register(struct vmctx *ctx, int vcpu, int reg, uint64_t *retval);
 int	vm_run(struct vmctx *ctx, int vcpu, uint64_t rip,
 	       struct vm_exit *ret_vmexit);
 int	vm_apicid2vcpu(struct vmctx *ctx, int apicid);
-int	vm_inject_event(struct vmctx *ctx, int vcpu, enum vm_event_type type,
-			int vector);
-int	vm_inject_event2(struct vmctx *ctx, int vcpu, enum vm_event_type type,
-			 int vector, int error_code);
+int	vm_inject_exception(struct vmctx *ctx, int vcpu, int vec);
+int	vm_inject_exception2(struct vmctx *ctx, int vcpu, int vec, int errcode);
 int	vm_lapic_irq(struct vmctx *ctx, int vcpu, int vector);
 int	vm_lapic_local_irq(struct vmctx *ctx, int vcpu, int vector);
 int	vm_lapic_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg);