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KVM hypercalls use the VMCALL or VMMCALL instructions. Although the ABI is similar, those instructions no longer function for TDX guests. Make vendor-specific TDVMCALLs instead of VMCALL. This enables TDX guests to run with KVM acting as the hypervisor. Among other things, KVM hypercall is used to send IPIs. Since the KVM driver can be built as a kernel module, export tdx_kvm_hypercall() to make the symbols visible to kvm.ko. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20220405232939.73860-20-kirill.shutemov@linux.intel.com
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2021-2022 Intel Corporation */
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#ifndef _ASM_X86_TDX_H
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#define _ASM_X86_TDX_H
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#include <linux/init.h>
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#include <linux/bits.h>
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#include <asm/ptrace.h>
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#include <asm/shared/tdx.h>
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/*
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* SW-defined error codes.
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*
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* Bits 47:40 == 0xFF indicate Reserved status code class that never used by
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* TDX module.
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*/
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#define TDX_ERROR _BITUL(63)
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#define TDX_SW_ERROR (TDX_ERROR | GENMASK_ULL(47, 40))
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#define TDX_SEAMCALL_VMFAILINVALID (TDX_SW_ERROR | _UL(0xFFFF0000))
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#ifndef __ASSEMBLY__
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/*
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* Used to gather the output registers values of the TDCALL and SEAMCALL
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* instructions when requesting services from the TDX module.
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*
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* This is a software only structure and not part of the TDX module/VMM ABI.
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*/
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struct tdx_module_output {
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u64 rcx;
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u64 rdx;
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u64 r8;
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u64 r9;
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u64 r10;
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u64 r11;
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};
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/*
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* Used by the #VE exception handler to gather the #VE exception
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* info from the TDX module. This is a software only structure
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* and not part of the TDX module/VMM ABI.
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*/
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struct ve_info {
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u64 exit_reason;
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u64 exit_qual;
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/* Guest Linear (virtual) Address */
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u64 gla;
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/* Guest Physical Address */
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u64 gpa;
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u32 instr_len;
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u32 instr_info;
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};
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#ifdef CONFIG_INTEL_TDX_GUEST
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void __init tdx_early_init(void);
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/* Used to communicate with the TDX module */
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u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
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struct tdx_module_output *out);
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void tdx_get_ve_info(struct ve_info *ve);
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bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
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void tdx_safe_halt(void);
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bool tdx_early_handle_ve(struct pt_regs *regs);
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#else
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static inline void tdx_early_init(void) { };
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static inline void tdx_safe_halt(void) { };
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static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; }
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#endif /* CONFIG_INTEL_TDX_GUEST */
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#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST)
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long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
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unsigned long p3, unsigned long p4);
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#else
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static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_TDX_H */
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