[PATCH 03/14] Nested Virtualization: function hooks

[Christoph Egger <Christoph.Egger@amd.com>]

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-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

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# HG changeset patch
# User cegger
# Date 1287134038 -7200
add nestedhvm function hooks for svm/vmx specific code

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

diff -r 85aa977891b6 -r 0c2b398816b1 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3310,6 +3310,98 @@ int hvm_debug_op(struct vcpu *v, int32_t
 }
 
 
+int nhvm_vcpu_initialise(struct vcpu *v)
+{
+    if (hvm_funcs.nhvm_vcpu_initialise)
+        return hvm_funcs.nhvm_vcpu_initialise(v);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vcpu_destroy(struct vcpu *v)
+{
+    if (hvm_funcs.nhvm_vcpu_destroy)
+        return hvm_funcs.nhvm_vcpu_destroy(v);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vcpu_reset(struct vcpu *v)
+{
+    if (hvm_funcs.nhvm_vcpu_reset)
+        return hvm_funcs.nhvm_vcpu_reset(v);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vcpu_hostrestore(struct vcpu *v, struct cpu_user_regs *regs)
+{
+    if (hvm_funcs.nhvm_vcpu_hostrestore)
+        return hvm_funcs.nhvm_vcpu_hostrestore(v, regs);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vcpu_vmentry(struct vcpu *v, struct cpu_user_regs *regs,
+                      unsigned int inst_len)
+{
+    if (hvm_funcs.nhvm_vcpu_vmentry)
+        return hvm_funcs.nhvm_vcpu_vmentry(v, regs, inst_len);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vcpu_vmexit(struct vcpu *v, struct cpu_user_regs *regs,
+                     uint64_t exitcode)
+{
+    if (hvm_funcs.nhvm_vcpu_vmexit)
+        return hvm_funcs.nhvm_vcpu_vmexit(v, regs, exitcode);
+    return -EOPNOTSUPP;
+}
+
+uint64_t nhvm_vmcx_exitcode_native2generic(struct vcpu *v, uint64_t exitcode)
+{
+    if (hvm_funcs.nhvm_vmcx_exitcode_native2generic)
+        return hvm_funcs.nhvm_vmcx_exitcode_native2generic(v, exitcode);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vmcx_guest_intercepts_trap(struct vcpu *v, unsigned int trap)
+{
+    if (hvm_funcs.nhvm_vmcx_guest_intercepts_trap)
+        return hvm_funcs.nhvm_vmcx_guest_intercepts_trap(v, trap);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vmcx_guest_intercepts_exitcode(struct vcpu *v,
+    struct cpu_user_regs *regs, uint64_t exitcode)
+{
+    if (hvm_funcs.nhvm_vmcx_guest_intercepts_exitcode)
+        return hvm_funcs.nhvm_vmcx_guest_intercepts_exitcode(v, regs, exitcode);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vmcx_prepare4vmexit(struct vcpu *v)
+{
+    if (hvm_funcs.nhvm_vmcx_prepare4vmexit)
+        return hvm_funcs.nhvm_vmcx_prepare4vmexit(v);
+    return -EOPNOTSUPP;
+}
+
+int nhvm_vmcx_isvalid(struct vcpu *v, uint64_t vmcxaddr)
+{
+    if (hvm_funcs.nhvm_vmcx_isvalid)
+        return hvm_funcs.nhvm_vmcx_isvalid(v, vmcxaddr);
+    return -EOPNOTSUPP;
+}
+
+int
+nhvm_vcpu_vmexit_trap(struct vcpu *v, unsigned int trapnr,
+                       int errcode, unsigned long cr2)
+{
+    return hvm_funcs.nhvm_vcpu_vmexit_trap(v, trapnr, errcode, cr2);
+}
+
+enum hvm_intblk nhvm_interrupt_blocked(struct vcpu *v)
+{
+    return hvm_funcs.nhvm_intr_blocked(v);
+}
+
 /*
  * Local variables:
  * mode: C
diff -r 85aa977891b6 -r 0c2b398816b1 xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -145,6 +145,31 @@ struct hvm_function_table {
     void (*set_uc_mode)(struct vcpu *v);
     void (*set_info_guest)(struct vcpu *v);
     void (*set_rdtsc_exiting)(struct vcpu *v, bool_t);
+
+    /* Nested HVM */
+    int (*nhvm_vcpu_initialise)(struct vcpu *v);
+    int (*nhvm_vcpu_destroy)(struct vcpu *v);
+    int (*nhvm_vcpu_reset)(struct vcpu *v);
+    int (*nhvm_vcpu_hostrestore)(struct vcpu *v,
+                                struct cpu_user_regs *regs);
+    int (*nhvm_vcpu_vmentry)(struct vcpu *v, struct cpu_user_regs *regs,
+                                unsigned int inst_len);
+    int (*nhvm_vcpu_vmexit)(struct vcpu *v, struct cpu_user_regs *regs,
+                                uint64_t exitcode);
+    int (*nhvm_vcpu_vmexit_trap)(struct vcpu *v,
+                                unsigned int trapnr,
+                                int errcode,
+                                unsigned long cr2);
+    uint64_t (*nhvm_vmcx_exitcode_native2generic)(struct vcpu *v,
+                                uint64_t exitcode);
+    int (*nhvm_vmcx_guest_intercepts_trap)(struct vcpu *v, unsigned int trapnr);
+    int (*nhvm_vmcx_guest_intercepts_exitcode)(struct vcpu *v,
+                                struct cpu_user_regs *regs,
+                                uint64_t exitcode);
+    int (*nhvm_vmcx_prepare4vmexit)(struct vcpu *v);
+
+    int (*nhvm_vmcx_isvalid)(struct vcpu *v, uint64_t vmcxaddr);
+    enum hvm_intblk (*nhvm_intr_blocked)(struct vcpu *v);
 };
 
 extern struct hvm_function_table hvm_funcs;
@@ -365,4 +390,45 @@ bool_t hvm_hap_nested_page_fault(unsigne
         ? (u32)__d->arch.incarnation : (u32)(v)->arch.hvm_vcpu.msr_tsc_aux; \
 })
 
+/*
+ * Nested HVM
+ */
+
+/* Initialize vcpu's struct nestedhvm */
+int nhvm_vcpu_initialise(struct vcpu *v);
+/* Destroy and free vcpu's struct nestedhvm */
+int nhvm_vcpu_destroy(struct vcpu *v);
+/* Reset vcpu's state when l1 guest disables nested virtualization */
+int nhvm_vcpu_reset(struct vcpu *v);
+/* Restores l1 guest state */
+int nhvm_vcpu_hostrestore(struct vcpu *v, struct cpu_user_regs *regs);
+/* Fill struct nestedhvm with data provided by l1 guest's VMCB/VMCS,
+ * save l1 guest state as needed,
+ * prepare VMCB/VMCS to be ready for use with VMRUN/VMLAUNCH */
+int nhvm_vcpu_vmentry(struct vcpu *v, struct cpu_user_regs *regs,
+                     unsigned int inst_len);
+/* Fill l1 guest's VMCB/VMCS with data provided by generic exit codes
+ * (do conversion as needed), other misc SVM/VMX specific tweaks to make
+ * it work */
+int nhvm_vcpu_vmexit(struct vcpu *v, struct cpu_user_regs *regs,
+                     uint64_t exitcode);
+/* inject vmexit into l1 guest */ 
+int nhvm_vcpu_vmexit_trap(struct vcpu *v,
+    unsigned int trapnr, int errcode, unsigned long cr2);
+/* convert native exitcode (= SVM/VMX specific) to generic exit code
+ * (used to inject vmexit into l1 guest. */
+uint64_t nhvm_vmcx_exitcode_native2generic(struct vcpu *v, uint64_t exitcode);
+/* returns true, when l1 guest intercepts the specified trap */
+int nhvm_vmcx_guest_intercepts_trap(struct vcpu *v, unsigned int trapnr);
+/* returns true, when l1 guest intercepts the specified native exitcode */
+int nhvm_vmcx_guest_intercepts_exitcode(struct vcpu *v,
+    struct cpu_user_regs *regs, uint64_t exitcode);
+/* prepare l1 guest's VMCB/VMCS for VMEXIT injection (restore shadowed fields),
+ * (implementation might be empty or very small with shadow VMCB/VMCS) */
+int nhvm_vmcx_prepare4vmexit(struct vcpu *v);
+/* Check virtual VMCB/VMCS if it is valid. Return TRAP_* in error case */
+int nhvm_vmcx_isvalid(struct vcpu *v, uint64_t vmcxaddr);
+/* interrupt */
+enum hvm_intblk nhvm_interrupt_blocked(struct vcpu *v);
+
 #endif /* __ASM_X86_HVM_HVM_H__ */

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