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Subject[RFC PATCH 1/3] arch/x86: add ACRN hypervisor guest
Date
ACRN is one open-source hypervisour, which is maintained by Linux
foundation. This is to add the para-virtualization support so that
it allows to enable the Linux guest on acrn-hypervisor.

This adds x86_hyper_acrn into supported hypervisors array, which
enables ACRN services guest running on ACRN hypervisor. It is
restricted to X86_64.

Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
---
arch/x86/Kconfig | 8 ++++++++
arch/x86/include/asm/hypervisor.h | 1 +
arch/x86/kernel/cpu/Makefile | 1 +
arch/x86/kernel/cpu/acrn.c | 36 ++++++++++++++++++++++++++++++++++++
arch/x86/kernel/cpu/hypervisor.c | 4 ++++
5 files changed, 50 insertions(+)
create mode 100644 arch/x86/kernel/cpu/acrn.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 90b562a..c7b64e7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -843,6 +843,14 @@ config JAILHOUSE_GUEST
cell. You can leave this option disabled if you only want to start
Jailhouse and run Linux afterwards in the root cell.

+config ACRN
+ bool "Enable services on ACRN hypervisor"
+ depends on X86_64 && PARAVIRT
+ help
+ This option allows to run Linux as guest in ACRN hypervisor.
+ It is needed if you want to run ACRN services linux on top of
+ ACRN hypervisor.
+
endif #HYPERVISOR_GUEST

source "arch/x86/Kconfig.cpu"
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 8c5aaba..50a30f6 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -29,6 +29,7 @@ enum x86_hypervisor_type {
X86_HYPER_XEN_HVM,
X86_HYPER_KVM,
X86_HYPER_JAILHOUSE,
+ X86_HYPER_ACRN,
};

#ifdef CONFIG_HYPERVISOR_GUEST
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index cfd24f9..cde1436 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_X86_CPU_RESCTRL) += resctrl/
obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o

obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
+obj-$(CONFIG_ACRN) += acrn.o

ifdef CONFIG_X86_FEATURE_NAMES
quiet_cmd_mkcapflags = MKCAP $@
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
new file mode 100644
index 0000000..ddeaafb
--- /dev/null
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACRN hypervisor support
+ *
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * Jason Chen CJ <jason.cj.chen@intel.com>
+ * Zhao Yakui <yakui.zhao@intel.com>
+ *
+ */
+
+#include <asm/hypervisor.h>
+
+static uint32_t __init acrn_detect(void)
+{
+ return hypervisor_cpuid_base("ACRNACRNACRN\0\0", 0);
+}
+
+static void __init acrn_init_platform(void)
+{
+}
+
+static bool acrn_x2apic_available(void)
+{
+ /* do not support x2apic */
+ return false;
+}
+
+const struct hypervisor_x86 x86_hyper_acrn = {
+ .name = "ACRN",
+ .detect = acrn_detect,
+ .type = X86_HYPER_ACRN,
+ .init.init_platform = acrn_init_platform,
+ .init.x2apic_available = acrn_x2apic_available,
+};
+EXPORT_SYMBOL(x86_hyper_acrn);
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index 479ca47..5a6f072 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -32,6 +32,7 @@ extern const struct hypervisor_x86 x86_hyper_xen_pv;
extern const struct hypervisor_x86 x86_hyper_xen_hvm;
extern const struct hypervisor_x86 x86_hyper_kvm;
extern const struct hypervisor_x86 x86_hyper_jailhouse;
+extern const struct hypervisor_x86 x86_hyper_acrn;

static const __initconst struct hypervisor_x86 * const hypervisors[] =
{
@@ -49,6 +50,9 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
#ifdef CONFIG_JAILHOUSE_GUEST
&x86_hyper_jailhouse,
#endif
+#ifdef CONFIG_ACRN
+ &x86_hyper_acrn,
+#endif
};

enum x86_hypervisor_type x86_hyper_type;
--
2.7.4
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