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The Service VM communicates with the hypervisor via conventional hypercalls. VMCALL instruction is used to make the hypercalls. ACRN hypercall ABI: * Hypercall number is in R8 register. * Up to 2 parameters are in RDI and RSI registers. * Return value is in RAX register. Introduce the ACRN hypercall interfaces. Because GCC doesn't support R8 register as direct register constraints, use supported constraint as input with a explicit MOV to R8 in beginning of asm. Cc: Dave Hansen <dave.hansen@intel.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Fengwei Yin <fengwei.yin@intel.com> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Arvind Sankar <nivedita@alum.mit.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Originally-by: Yakui Zhao <yakui.zhao@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-5-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_ACRN_H
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#define _ASM_X86_ACRN_H
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/*
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* This CPUID returns feature bitmaps in EAX.
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* Guest VM uses this to detect the appropriate feature bit.
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*/
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#define ACRN_CPUID_FEATURES 0x40000001
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/* Bit 0 indicates whether guest VM is privileged */
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#define ACRN_FEATURE_PRIVILEGED_VM BIT(0)
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void acrn_setup_intr_handler(void (*handler)(void));
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void acrn_remove_intr_handler(void);
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static inline u32 acrn_cpuid_base(void)
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{
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if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
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return hypervisor_cpuid_base("ACRNACRNACRN", 0);
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return 0;
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}
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/*
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* Hypercalls for ACRN
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*
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* - VMCALL instruction is used to implement ACRN hypercalls.
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* - ACRN hypercall ABI:
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* - Hypercall number is passed in R8 register.
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* - Up to 2 arguments are passed in RDI, RSI.
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* - Return value will be placed in RAX.
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*
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* Because GCC doesn't support R8 register as direct register constraints, use
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* supported constraint as input with a explicit MOV to R8 in beginning of asm.
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*/
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static inline long acrn_hypercall0(unsigned long hcall_id)
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{
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long result;
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asm volatile("movl %1, %%r8d\n\t"
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"vmcall\n\t"
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: "=a" (result)
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: "g" (hcall_id)
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: "r8", "memory");
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return result;
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}
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static inline long acrn_hypercall1(unsigned long hcall_id,
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unsigned long param1)
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{
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long result;
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asm volatile("movl %1, %%r8d\n\t"
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"vmcall\n\t"
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: "=a" (result)
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: "g" (hcall_id), "D" (param1)
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: "r8", "memory");
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return result;
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}
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static inline long acrn_hypercall2(unsigned long hcall_id,
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unsigned long param1,
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unsigned long param2)
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{
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long result;
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asm volatile("movl %1, %%r8d\n\t"
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"vmcall\n\t"
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: "=a" (result)
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: "g" (hcall_id), "D" (param1), "S" (param2)
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: "r8", "memory");
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return result;
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}
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#endif /* _ASM_X86_ACRN_H */
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