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Date: Mon, 18 Oct 2021 18:33:31 +0300 From: "Kirill A. Shutemov" <kirill@...temov.name> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Tom Lendacky <thomas.lendacky@....com>, Joerg Roedel <jroedel@...e.de> Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>, Andi Kleen <ak@...ux.intel.com>, Dave Hansen <dave.hansen@...el.com>, Sean Christopherson <seanjc@...gle.com>, x86@...nel.org, linux-kernel@...r.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Tony Luck <tony.luck@...el.com> Subject: [PATCH 1/3] x86/insn-eval: Introduce insn_get_modrm_reg_ptr() The helper returns a pointer to the register indicated by ModRM byte. It's going to replace vc_insn_get_reg() in the SEV MMIO implementation. TDX MMIO implementation will also use it. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> Reviewed-by: Andi Kleen <ak@...ux.intel.com> Reviewed-by: Tony Luck <tony.luck@...el.com> --- arch/x86/include/asm/insn-eval.h | 1 + arch/x86/lib/insn-eval.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h index 91d7182ad2d6..041f399153b9 100644 --- a/arch/x86/include/asm/insn-eval.h +++ b/arch/x86/include/asm/insn-eval.h @@ -19,6 +19,7 @@ bool insn_has_rep_prefix(struct insn *insn); void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs); int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs); int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs); +void *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs); unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx); int insn_get_code_seg_params(struct pt_regs *regs); int insn_fetch_from_user(struct pt_regs *regs, diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c index a1d24fdc07cf..fbaa3fa24bde 100644 --- a/arch/x86/lib/insn-eval.c +++ b/arch/x86/lib/insn-eval.c @@ -850,6 +850,26 @@ int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs) return get_reg_offset(insn, regs, REG_TYPE_REG); } +/** + * insn_get_modrm_reg_ptr() - Obtain register pointer based on ModRM byte + * @insn: Instruction containing the ModRM byte + * @regs: Register values as seen when entering kernel mode + * + * Returns: + * + * The register indicated by the reg part of the ModRM byte. + * The register is obtained as a pointer within pt_regs. + */ +void *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs) +{ + int offset; + + offset = insn_get_modrm_reg_off(insn, regs); + if (offset < 0) + return NULL; + return (void *)regs + offset; +} + /** * get_seg_base_limit() - obtain base address and limit of a segment * @insn: Instruction. Must be valid. -- 2.32.0
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