Messages in this thread Patch in this message | | | From | Zhao Yakui <> | Subject | [RFC PATCH v2 3/3] arch/x86/acrn: add hypercall for acrn_guest | Date | Tue, 26 Mar 2019 12:53:43 +0800 |
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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.
V1->V2: Refine the comments for the function of acrn_hypercall0/1/2
Co-developed-by: Jason Chen CJ <jason.cj.chen@intel.com> Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com> Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> --- arch/x86/include/asm/acrn_hypercall.h | 84 +++++++++++++++++++++++++++++++++++ 1 file changed, 84 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..3262935 --- /dev/null +++ b/arch/x86/include/asm/acrn_hypercall.h @@ -0,0 +1,84 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * acrn_hypercall.h : acrn hypervisor call API + */ + +#ifndef __ACRN_HYPERCALL_H__ +#define __ACRN_HYPERCALL_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 long result asm("rax"); + register unsigned long r8 asm("r8") = hcall_id; + + asm volatile(".byte 0x0F,0x01,0xC1\n" + : "=r"(result) + : "r"(r8)); + + return result; +} + +static inline long acrn_hypercall1(unsigned long hcall_id, + unsigned long param1) +{ + + register long result asm("rax"); + register unsigned long r8 asm("r8") = hcall_id; + + asm volatile(".byte 0x0F,0x01,0xC1\n" + : "=r"(result) + : "D"(param1), "r"(r8)); + + return result; +} + +static inline long acrn_hypercall2(unsigned long hcall_id, + unsigned long param1, + unsigned long param2) +{ + + register long result asm("rax"); + register unsigned long r8 asm("r8") = hcall_id; + + asm volatile(".byte 0x0F,0x01,0xC1\n" + : "=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 /* __ACRN_HYPERCALL_H__ */ -- 2.7.4
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