linux-kernel - [PATCH v4 06/15] KVM: arm64: Add paravirtualization header files

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Date:   Sun, 15 Aug 2021 08:59:38 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        james.morse@....com, mark.rutland@....com,
        Jonathan.Cameron@...wei.com, will@...nel.org, maz@...nel.org,
        pbonzini@...hat.com, vkuznets@...hat.com, shan.gavin@...il.com
Subject: [PATCH v4 06/15] KVM: arm64: Add paravirtualization header files

We need put more stuff in the paravirtualization header files when
the asynchronous page fault is supported. The generic header files
can't meet the goal. This duplicate the generic header files to be
our platform specific header files. It's the preparatory work to
support the asynchronous page fault in the subsequent patches:

   include/uapi/asm-generic/kvm_para.h
   include/asm-generic/kvm_para.h

   arch/arm64/include/uapi/asm/kvm_para.h
   arch/arm64/include/asm/kvm_para.h

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/include/asm/kvm_para.h      | 27 ++++++++++++++++++++++++++
 arch/arm64/include/uapi/asm/Kbuild     |  2 --
 arch/arm64/include/uapi/asm/kvm_para.h |  5 +++++
 3 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm64/include/asm/kvm_para.h
 create mode 100644 arch/arm64/include/uapi/asm/kvm_para.h

diff --git a/arch/arm64/include/asm/kvm_para.h b/arch/arm64/include/asm/kvm_para.h
new file mode 100644
index 000000000000..0ea481dd1c7a
--- /dev/null
+++ b/arch/arm64/include/asm/kvm_para.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_ARM_KVM_PARA_H
+#define _ASM_ARM_KVM_PARA_H
+
+#include <uapi/asm/kvm_para.h>
+
+static inline bool kvm_check_and_clear_guest_paused(void)
+{
+	return false;
+}
+
+static inline unsigned int kvm_arch_para_features(void)
+{
+	return 0;
+}
+
+static inline unsigned int kvm_arch_para_hints(void)
+{
+	return 0;
+}
+
+static inline bool kvm_para_available(void)
+{
+	return false;
+}
+
+#endif /* _ASM_ARM_KVM_PARA_H */
diff --git a/arch/arm64/include/uapi/asm/Kbuild b/arch/arm64/include/uapi/asm/Kbuild
index 602d137932dc..f66554cd5c45 100644
--- a/arch/arm64/include/uapi/asm/Kbuild
+++ b/arch/arm64/include/uapi/asm/Kbuild
@@ -1,3 +1 @@
 # SPDX-License-Identifier: GPL-2.0
-
-generic-y += kvm_para.h
diff --git a/arch/arm64/include/uapi/asm/kvm_para.h b/arch/arm64/include/uapi/asm/kvm_para.h
new file mode 100644
index 000000000000..cd212282b90c
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/kvm_para.h
@@ -0,0 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_ASM_ARM_KVM_PARA_H
+#define _UAPI_ASM_ARM_KVM_PARA_H
+
+#endif /* _UAPI_ASM_ARM_KVM_PARA_H */
-- 
2.23.0