[RFC PATCH 14/73] KVM: x86: Create stubs for PVM module as a new vendor

Lai Jiangshan
2024-02-26T14:35:23Z

Add a new Kconfig option and create stub files for what will eventually
be a new module named PVM (Pagetable-based PV Virtual Machine). PVM will
function as a vendor module, similar to VMX/SVM for KVM, but it doesn't
require hardware virtualization assistance.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
---
arch/x86/kvm/Kconfig | 9 +++++++++
arch/x86/kvm/Makefile | 3 +++
arch/x86/kvm/pvm/pvm.c | 26 ++++++++++++++++++++++++++
3 files changed, 38 insertions(+)
create mode 100644 arch/x86/kvm/pvm/pvm.c

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 950c12868d30..49a8b3489a0a 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -118,6 +118,15 @@ config KVM_AMD_SEV
Provides support for launching Encrypted VMs (SEV) and Encrypted VMs
with Encrypted State (SEV-ES) on AMD processors.

+config KVM_PVM
+ tristate "Pagetable-based PV Virtual Machine"
+ depends on KVM && X86_64
+ help
+ Provides Pagetable-based PV Virtual Machine for KVM.
+
+ To compile this as a module, choose M here: the module
+ will be called kvm-pvm.
+
config KVM_SMM
bool "System Management Mode emulation"
default y
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 97bad203b1b1..036458a27d5e 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -33,9 +33,12 @@ ifdef CONFIG_HYPERV
kvm-amd-y += svm/svm_onhyperv.o
endif

+kvm-pvm-y += pvm/pvm.o
+
obj-$(CONFIG_KVM) += kvm.o
obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
obj-$(CONFIG_KVM_AMD) += kvm-amd.o
+obj-$(CONFIG_KVM_PVM) += kvm-pvm.o

AFLAGS_svm/vmenter.o := -iquote $(obj)
$(obj)/svm/vmenter.o: $(obj)/kvm-asm-offsets.h
diff --git a/arch/x86/kvm/pvm/pvm.c b/arch/x86/kvm/pvm/pvm.c
new file mode 100644
index 000000000000..1dfa1ae57c8c
--- /dev/null
+++ b/arch/x86/kvm/pvm/pvm.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Pagetable-based Virtual Machine driver for Linux
+ *
+ * Copyright (C) 2020 Ant Group
+ * Copyright (C) 2020 Alibaba Group
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#include <linux/module.h>
+
+MODULE_AUTHOR("AntGroup");
+MODULE_LICENSE("GPL");
+
+static void pvm_exit(void)
+{
+}
+module_exit(pvm_exit);
+
+static int __init pvm_init(void)
+{
+ return 0;
+}
+module_init(pvm_init);
--
2.19.1.6.gb485710b