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https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
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597cfe4821
Install an exception handler for #VC exception that uses a GHCB. Also add the infrastructure for handling different exit-codes by decoding the instruction that caused the exception and error handling. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-24-joro@8bytes.org
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* AMD Encrypted Register State Support
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*
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* Author: Joerg Roedel <jroedel@suse.de>
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*/
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#ifndef __ASM_ENCRYPTED_STATE_H
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#define __ASM_ENCRYPTED_STATE_H
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#include <linux/types.h>
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#include <asm/insn.h>
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#define GHCB_SEV_INFO 0x001UL
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#define GHCB_SEV_INFO_REQ 0x002UL
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#define GHCB_INFO(v) ((v) & 0xfffUL)
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#define GHCB_PROTO_MAX(v) (((v) >> 48) & 0xffffUL)
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#define GHCB_PROTO_MIN(v) (((v) >> 32) & 0xffffUL)
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#define GHCB_PROTO_OUR 0x0001UL
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#define GHCB_SEV_CPUID_REQ 0x004UL
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#define GHCB_CPUID_REQ_EAX 0
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#define GHCB_CPUID_REQ_EBX 1
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#define GHCB_CPUID_REQ_ECX 2
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#define GHCB_CPUID_REQ_EDX 3
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#define GHCB_CPUID_REQ(fn, reg) (GHCB_SEV_CPUID_REQ | \
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(((unsigned long)reg & 3) << 30) | \
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(((unsigned long)fn) << 32))
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#define GHCB_PROTOCOL_MAX 0x0001UL
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#define GHCB_DEFAULT_USAGE 0x0000UL
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#define GHCB_SEV_CPUID_RESP 0x005UL
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#define GHCB_SEV_TERMINATE 0x100UL
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#define GHCB_SEV_TERMINATE_REASON(reason_set, reason_val) \
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(((((u64)reason_set) & 0x7) << 12) | \
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((((u64)reason_val) & 0xff) << 16))
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#define GHCB_SEV_ES_REASON_GENERAL_REQUEST 0
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#define GHCB_SEV_ES_REASON_PROTOCOL_UNSUPPORTED 1
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#define GHCB_SEV_GHCB_RESP_CODE(v) ((v) & 0xfff)
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#define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
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enum es_result {
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ES_OK, /* All good */
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ES_UNSUPPORTED, /* Requested operation not supported */
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ES_VMM_ERROR, /* Unexpected state from the VMM */
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ES_DECODE_FAILED, /* Instruction decoding failed */
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ES_EXCEPTION, /* Instruction caused exception */
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ES_RETRY, /* Retry instruction emulation */
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};
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struct es_fault_info {
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unsigned long vector;
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unsigned long error_code;
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unsigned long cr2;
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};
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struct pt_regs;
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/* ES instruction emulation context */
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struct es_em_ctxt {
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struct pt_regs *regs;
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struct insn insn;
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struct es_fault_info fi;
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};
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void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
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static inline u64 lower_bits(u64 val, unsigned int bits)
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{
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u64 mask = (1ULL << bits) - 1;
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return (val & mask);
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}
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#endif
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