[PATCH 07/14] Nested Virtualization: trap

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

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

-- 
---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 1281003849 -7200
When injecting an exception into L2 guest,
inject a #VMEXIT if L1 guest intercepts the exception

diff -r b1a356e5658d -r 7789f1d7d7e7 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -965,6 +965,63 @@ void hvm_triple_fault(void)
     domain_shutdown(v->domain, SHUTDOWN_reboot);
 }
 
+int hvm_inject_exception(unsigned int trapnr, int errcode, unsigned long cr2)
+{
+    uint64_t exitcode;
+    bool_t is_intercepted;
+    struct vcpu *v = current;
+    struct nestedhvm *hvm = &VCPU_NESTEDHVM(v);
+
+    if ( !nestedhvm_enabled(v->domain) ) {
+        hvm_funcs.inject_exception(trapnr, errcode, cr2);
+        return 0;
+    }
+
+    if ( nestedhvm_vmentry_emulate(v) ) {
+        hvm_funcs.inject_exception(trapnr, errcode, cr2);
+        return 0;
+    }
+
+    if ( !nestedhvm_vcpu_in_guestmode(v) ) {
+        hvm_funcs.inject_exception(trapnr, errcode, cr2);
+        return 0;
+    }
+
+    exitcode = nestedhvm_exception2exitcode(trapnr);
+    hvm->nh_hostflags.fields.forcevmexit = 1;
+    hvm->nh_forcevmexit.exitcode = exitcode;
+    is_intercepted = hvm_nestedhvm_vm_intercepted_by_guest(v, exitcode);
+    hvm->nh_hostflags.fields.forcevmexit = 0;
+
+    if ( is_intercepted )
+    {
+        enum nestedhvm_vmexits nsret;
+
+        hvm->nh_forcevmexit.exitcode = exitcode;
+        hvm->nh_forcevmexit.exitinfo1 = errcode;
+        hvm->nh_forcevmexit.exitinfo2 = cr2;
+
+        hvm->nh_hostflags.fields.forcevmexit = 1;
+        nsret = nestedhvm_vcpu_vmexit(v, guest_cpu_user_regs(), 0 /* dummy */);
+        hvm->nh_hostflags.fields.forcevmexit = 0;
+
+        switch (nsret) {
+        case NESTEDHVM_VMEXIT_DONE:
+        case NESTEDHVM_VMEXIT_ERROR: /* L1 guest will crash L2 guest */
+            return 1;
+        case NESTEDHVM_VMEXIT_HOST:
+        case NESTEDHVM_VMEXIT_CONTINUE:
+        case NESTEDHVM_VMEXIT_FATALERROR:
+        default:
+            gdprintk(XENLOG_ERR, "unexpected nestedhvm error %i\n", nsret);
+            return -1;
+        }
+    }
+
+    hvm_funcs.inject_exception(trapnr, errcode, cr2);
+    return 0;
+}
+
 bool_t hvm_hap_nested_page_fault(unsigned long gfn)
 {
     p2m_type_t p2mt;
diff -r b1a356e5658d -r 7789f1d7d7e7 xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -279,11 +279,7 @@ void hvm_migrate_timers(struct vcpu *v);
 void hvm_do_resume(struct vcpu *v);
 void hvm_migrate_pirqs(struct vcpu *v);
 
-static inline void
-hvm_inject_exception(unsigned int trapnr, int errcode, unsigned long cr2)
-{
-    hvm_funcs.inject_exception(trapnr, errcode, cr2);
-}
+int hvm_inject_exception(unsigned int trapnr, int errcode, unsigned long cr2);
 
 static inline int hvm_event_pending(struct vcpu *v)
 {

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