x86, hvm: Hyper-V guest interface support with small set of enlightenments

A minimal implementation of the Viridian (Hyper-V) guest
interface. The only enlightenments advertised and supported are vAPIC
MSRs and long-spin-wait notifications. The set of enlightenments can
easily be extended in future, as they are found to provide a
performance win, and configured via an extended HVM_PARAM_VIRIDIAN hvm
parameter.

Signed-off-by: Peter Johnston <peter.johnston@citrix.com>
Signed-off-by: Tim Deegan <tim.deegan@citrix.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/xen/include/asm-x86/hvm/viridian.h b/xen/include/asm-x86/hvm/viridian.h
new file mode 100644
index 0000000000..ac16966172
--- /dev/null
+++ b/xen/include/asm-x86/hvm/viridian.h
@@ -0,0 +1,65 @@
+/*****************************************************************************
+ *
+ * include/xen/viridian.h
+ *
+ * Copyright (c) 2008 Citrix Corp.
+ *
+ */
+
+#ifndef __ASM_X86_HVM_VIRIDIAN_H__
+#define __ASM_X86_HVM_VIRIDIAN_H__
+
+union viridian_guest_os_id
+{
+    uint64_t raw;
+    struct
+    {
+        uint64_t build_number:16;
+        uint64_t service_pack:8;
+        uint64_t minor:8;
+        uint64_t major:8;
+        uint64_t os:8;
+        uint64_t vendor:16;
+    } fields;
+};
+
+union viridian_hypercall_gpa
+{   uint64_t raw;
+    struct
+    {
+        uint64_t enabled:1;
+        uint64_t reserved_preserved:11;
+        uint64_t pfn:48;
+    } fields;
+};
+
+struct viridian_domain
+{
+    union viridian_guest_os_id guest_os_id;
+    union viridian_hypercall_gpa hypercall_gpa;
+};
+
+int
+cpuid_viridian_leaves(
+    unsigned int leaf,
+    unsigned int *eax,
+    unsigned int *ebx,
+    unsigned int *ecx,
+    unsigned int *edx);
+
+int
+wrmsr_viridian_regs(
+    uint32_t idx,
+    uint32_t eax,
+    uint32_t edx);
+
+int
+rdmsr_viridian_regs(
+    uint32_t idx,
+    uint32_t *eax,
+    uint32_t *edx);
+
+int
+viridian_hypercall(struct cpu_user_regs *regs);
+
+#endif /* __ASM_X86_HVM_VIRIDIAN_H__ */