When acrn_hypervisor is detected, the hypercall is needed so that the
acrn guest can query/config some settings. For example: it can be used
to query the resources in hypervisor and manage the CPU/memory/device/
interrupt for Guest system.
So the hypercall is added so that the kernel can communicate with the
low-level acrn-hypervisor. On x86 it is implemented by using vmacll when
the acrn hypervisor is enabled.
Co-developed-by: Jason Chen CJ <jason.cj.c...@intel.com>
Signed-off-by: Jason Chen CJ <jason.cj.c...@intel.com>
Signed-off-by: Zhao Yakui <yakui.z...@intel.com>
---
V1->V2: Refine the comments for the function of acrn_hypercall0/1/2
v2->v3: Use the "vmcall" mnemonic to replace hard-code byte definition
---
arch/x86/include/asm/acrn_hypercall.h | 82 +++++++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
create mode 100644 arch/x86/include/asm/acrn_hypercall.h
diff --git a/arch/x86/include/asm/acrn_hypercall.h
b/arch/x86/include/asm/acrn_hypercall.h
new file mode 100644
index 0000000..82c1577
--- /dev/null
+++ b/arch/x86/include/asm/acrn_hypercall.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_X86_ACRNHYPERCALL_H
+#define _ASM_X86_ACRNHYPERCALL_H
+
+#include <linux/errno.h>
+
+#ifdef CONFIG_ACRN_GUEST
+
+/*
+ * Hypercalls for ACRN Guest
+ *
+ * Hypercall number is passed in r8 register.
+ * Return value will be placed in rax.
+ * Up to 2 arguments are passed in rdi, rsi.
+ */
+
+static inline long acrn_hypercall0(unsigned long hcall_id)
+{
+ register unsigned long r8 asm("r8") = hcall_id;
+ register long result asm("rax");
+
+ /* vmcall is used to implment the hypercall.
+ * asm volatile is used to avoid that it is dropped because of
+ * compiler optimization.
+ */
+ asm volatile("vmcall"
+ : "=r"(result)
+ : "r"(r8));
+
+ return result;
+}
+
+static inline long acrn_hypercall1(unsigned long hcall_id,
+ unsigned long param1)
+{
+ register unsigned long r8 asm("r8") = hcall_id;
+ register long result asm("rax");
+
+ asm volatile("vmcall"
+ : "=r"(result)
+ : "D"(param1), "r"(r8));
+
+ return result;
+}
+
+static inline long acrn_hypercall2(unsigned long hcall_id,
+ unsigned long param1,
+ unsigned long param2)
+{
+ register unsigned long r8 asm("r8") = hcall_id;
+ register long result asm("rax");
+
+ asm volatile("vmcall"
+ : "=r"(result)
+ : "D"(param1), "S"(param2), "r"(r8));
+
+ return result;
+}
+
+#else
+
+static inline long acrn_hypercall0(unsigned long hcall_id)
+{
+ return -ENOTSUPP;
+}
+
+static inline long acrn_hypercall1(unsigned long hcall_id,
+ unsigned long param1)
+{
+ return -ENOTSUPP;
+}
+
+static inline long acrn_hypercall2(unsigned long hcall_id,
+ unsigned long param1,
+ unsigned long param2)
+{
+ return -ENOTSUPP;
+}
+#endif
+
+#endif /* _ASM_X86_ACRNHYPERCALL_H */
--
2.7.4
