xvisor: Initial commit of Xvisor Hypervisor

This commit adds support for building the baremetal Xvisor Hypervisor.

I have only tested this with RISC-V so currently only RISC-V is marked
as a COMPATIBLE_HOST, although Xvisor does support multiple other
architectures.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-extended/xvisor/files/0001-TESTS-Don-t-specify-mabi-or-march-for-RISC-V.patch

@@ -0,0 +1,34 @@
+From 022c885d077dce6fad3eca5fd2f54b2070c375d2 Mon Sep 17 00:00:00 2001
+From: Alistair Francis <alistair.francis@wdc.com>
+Date: Fri, 17 May 2019 14:21:44 -0700
+Subject: [PATCH] TESTS: Don't specify mabi or march for RISC-V
+
+To avoid
+    can't link double-float modules with soft-float modules
+errors when building 32-bit baremetal guests don't specify mabi
+or march.
+
+Upstream-Status: Inappropriate [Fixes a 32-bit Yocto flow bug]
+Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
+---
+ tests/riscv/common/basic/Makefile.inc | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/tests/riscv/common/basic/Makefile.inc b/tests/riscv/common/basic/Makefile.inc
+index 9fa5abed..f3ff1864 100644
+--- a/tests/riscv/common/basic/Makefile.inc
++++ b/tests/riscv/common/basic/Makefile.inc
+@@ -24,8 +24,8 @@
+ ARCH_CPPFLAGS=$(board_cppflags) -DFIRMWARE_BOOT
+ ARCH_CPPFLAGS+=-DTEXT_START=$(board_text_start)
+ ifeq ($(board_32bit),y)
+-ARCH_CFLAGS=$(board_cflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mabi=ilp32 -march=rv32imafdc -mcmodel=medany
+-ARCH_ASFLAGS=$(board_asflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mabi=ilp32 -march=rv32imafdc -mcmodel=medany
++ARCH_CFLAGS=$(board_cflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mcmodel=medany
++ARCH_ASFLAGS=$(board_asflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mcmodel=medany
+ else
+ ARCH_CFLAGS=$(board_cflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mabi=lp64 -march=rv64imafdc -mcmodel=medany
+ ARCH_ASFLAGS=$(board_asflags) -fno-omit-frame-pointer -fno-optimize-sibling-calls -mno-save-restore -mstrict-align -mabi=lp64 -march=rv64imafdc -mcmodel=medany
+-- 
+2.21.0
+

recipes-extended/xvisor/xvisor-configs.inc

@@ -0,0 +1,25 @@
+def get_oemake_config(d):
+    plat = d.getVar('XVISOR_PLAT')
+
+    if plat is None:
+        return ""
+
+    if 'riscv/virt32' in plat:
+        return "generic-32b-defconfig"
+    if 'riscv/virt64' in plat:
+        return "generic-64b-defconfig"
+
+    return ""
+
+def map_xvisor_arch(a, d):
+    import re
+
+    if   re.match('(i.86|x86.64)$', a):  return 'x86'
+    elif re.match('armeb$', a):                 return 'arm'
+    elif re.match('aarch64$', a):               return 'arm'
+    elif re.match('aarch64_be$', a):            return 'arm'
+    elif re.match('aarch64_ilp32$', a):         return 'arm'
+    elif re.match('aarch64_be_ilp32$', a):      return 'arm'
+    elif re.match('riscv(32|64|)(eb|)$', a):    return 'riscv'
+    else:
+        bb.error("cannot map '%s' to a Xvisor architecture" % a)

recipes-extended/xvisor/xvisor_0.3.0.bb

@@ -0,0 +1,44 @@
+SUMMARY = "Xvisor is an open-source type-1 hypervisor, which aims at providing a monolithic, light-weight, portable, and flexible virtualization solution."
+DESCRIPTION = "Xvisor primarily supports Full virtualization hence, supports a wide range of unmodified guest operating systems. Paravirtualization is optional for Xvisor and will be supported in an architecture independent manner (such as VirtIO PCI/MMIO devices) to ensure no-change in guest OS for using paravirtualization."
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
+DEPENDS += "dtc-native dosfstools-native mtools-native"
+
+require xvisor-configs.inc
+
+inherit autotools-brokensep
+
+SRCREV = "58592ef18c71526a0045935d1e8eed5e8553b7d6"
+SRC_URI = "git://github.com/xvisor/xvisor.git \
+           file://0001-TESTS-Don-t-specify-mabi-or-march-for-RISC-V.patch \
+          "
+
+S = "${WORKDIR}/git"
+
+EXTRA_OEMAKE += "ARCH=\"${@map_xvisor_arch(d.getVar('TARGET_ARCH'), d)}\" I=${D}"
+
+CONFIG = "${@get_oemake_config(d)}"
+
+do_configure() {
+    oe_runmake ${CONFIG}
+}
+
+do_install_append() {
+    install -d ${D}
+    install -m 755 ${B}/build/vmm.* ${D}/
+
+    # We don't need this
+    rm ${D}/system.map
+}
+
+do_deploy () {
+    install -d ${DEPLOY_DIR_IMAGE}
+    install -m 755 ${D}/vmm.* ${DEPLOY_DIR_IMAGE}/
+}
+
+addtask deploy after do_install
+
+FILES_${PN} += "/vmm.*"
+
+COMPATIBLE_HOST = "(riscv64|riscv32).*"
+INHIBIT_PACKAGE_STRIP = "1"