Nested VMX: Add APIs for nestedhvm_ops.

Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Eddie Dong <eddie.dong@intel.com>
Acked-by: Tim Deegan <Tim.Deegan@citrix.com>
Committed-by: Tim Deegan <Tim.Deegan@citrix.com>

xen/arch/x86/hvm/hvm.c

@@ -3526,7 +3526,7 @@ long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE(void) arg)
                 /* Remove the check below once we have
                  * shadow-on-shadow.
                  */
-                if ( !paging_mode_hap(d) && a.value )
+                if ( cpu_has_svm && !paging_mode_hap(d) && a.value )
                     rc = -EINVAL;
                 /* Set up NHVM state for any vcpus that are already up */
                 if ( !d->arch.hvm_domain.params[HVM_PARAM_NESTEDHVM] )

xen/arch/x86/hvm/vmx/Makefile

@@ -4,3 +4,4 @@ obj-y += realmode.o
 obj-y += vmcs.o
 obj-y += vmx.o
 obj-y += vpmu_core2.o
+obj-y += vvmx.o

xen/arch/x86/hvm/vmx/vmx.c

@@ -1404,7 +1404,13 @@ static struct hvm_function_table __read_mostly vmx_function_table = {
     .invlpg_intercept     = vmx_invlpg_intercept,
     .set_uc_mode          = vmx_set_uc_mode,
     .set_info_guest       = vmx_set_info_guest,
-    .set_rdtsc_exiting    = vmx_set_rdtsc_exiting
+    .set_rdtsc_exiting    = vmx_set_rdtsc_exiting,
+    .nhvm_vcpu_initialise = nvmx_vcpu_initialise,
+    .nhvm_vcpu_destroy    = nvmx_vcpu_destroy,
+    .nhvm_vcpu_reset      = nvmx_vcpu_reset,
+    .nhvm_vcpu_guestcr3   = nvmx_vcpu_guestcr3,
+    .nhvm_vcpu_hostcr3    = nvmx_vcpu_hostcr3,
+    .nhvm_vcpu_asid       = nvmx_vcpu_asid
 };
 
 struct hvm_function_table * __init start_vmx(void)

xen/arch/x86/hvm/vmx/vvmx.c

@@ -0,0 +1,88 @@
+/*
+ * vvmx.c: Support virtual VMX for nested virtualization.
+ *
+ * Copyright (c) 2010, Intel Corporation.
+ * Author: Qing He <qing.he@intel.com>
+ *         Eddie Dong <eddie.dong@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ */
+
+#include <xen/config.h>
+#include <asm/types.h>
+#include <asm/p2m.h>
+#include <asm/hvm/vmx/vmx.h>
+#include <asm/hvm/vmx/vvmx.h>
+
+int nvmx_vcpu_initialise(struct vcpu *v)
+{
+    struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
+    struct nestedvcpu *nvcpu = &vcpu_nestedhvm(v);
+
+    nvcpu->nv_n2vmcx = alloc_xenheap_page();
+    if ( !nvcpu->nv_n2vmcx )
+    {
+        gdprintk(XENLOG_ERR, "nest: allocation for shadow vmcs failed\n");
+	goto out;
+    }
+    nvmx->vmxon_region_pa = 0;
+    nvcpu->nv_vvmcx = NULL;
+    nvcpu->nv_vvmcxaddr = VMCX_EADDR;
+    nvmx->intr.intr_info = 0;
+    nvmx->intr.error_code = 0;
+    nvmx->iobitmap[0] = NULL;
+    nvmx->iobitmap[1] = NULL;
+    return 0;
+out:
+    return -ENOMEM;
+}
+ 
+void nvmx_vcpu_destroy(struct vcpu *v)
+{
+    struct nestedvcpu *nvcpu = &vcpu_nestedhvm(v);
+
+    if ( nvcpu->nv_n2vmcx ) {
+        __vmpclear(virt_to_maddr(nvcpu->nv_n2vmcx));
+        free_xenheap_page(nvcpu->nv_n2vmcx);
+        nvcpu->nv_n2vmcx = NULL;
+    }
+}
+ 
+int nvmx_vcpu_reset(struct vcpu *v)
+{
+    return 0;
+}
+
+uint64_t nvmx_vcpu_guestcr3(struct vcpu *v)
+{
+    /* TODO */
+    ASSERT(0);
+    return 0;
+}
+
+uint64_t nvmx_vcpu_hostcr3(struct vcpu *v)
+{
+    /* TODO */
+    ASSERT(0);
+    return 0;
+}
+
+uint32_t nvmx_vcpu_asid(struct vcpu *v)
+{
+    /* TODO */
+    ASSERT(0);
+    return 0;
+}
+

xen/include/asm-x86/hvm/vmx/vvmx.h

@@ -34,5 +34,13 @@ struct nestedvmx {
 };
 
 #define vcpu_2_nvmx(v)	(vcpu_nestedhvm(v).u.nvmx)
+
+int nvmx_vcpu_initialise(struct vcpu *v);
+void nvmx_vcpu_destroy(struct vcpu *v);
+int nvmx_vcpu_reset(struct vcpu *v);
+uint64_t nvmx_vcpu_guestcr3(struct vcpu *v);
+uint64_t nvmx_vcpu_hostcr3(struct vcpu *v);
+uint32_t nvmx_vcpu_asid(struct vcpu *v);
+
 #endif /* __ASM_X86_HVM_VVMX_H__ */