From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3E61C3A59B for ; Fri, 16 Aug 2019 02:33:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 93A1C21773 for ; Fri, 16 Aug 2019 02:33:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726594AbfHPCdH (ORCPT ); Thu, 15 Aug 2019 22:33:07 -0400 Received: from mga09.intel.com ([134.134.136.24]:24671 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726523AbfHPCdD (ORCPT ); Thu, 15 Aug 2019 22:33:03 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Aug 2019 19:33:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,391,1559545200"; d="scan'208";a="194894481" Received: from genxtest-ykzhao.sh.intel.com ([10.239.143.71]) by fmsmga001.fm.intel.com with ESMTP; 15 Aug 2019 19:33:02 -0700 From: Zhao Yakui To: x86@kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org Cc: Zhao Yakui , Jason Chen CJ Subject: [RFC PATCH 03/15] x86/acrn: Add hypercall for ACRN guest Date: Fri, 16 Aug 2019 10:25:44 +0800 Message-Id: <1565922356-4488-4-git-send-email-yakui.zhao@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1565922356-4488-1-git-send-email-yakui.zhao@intel.com> References: <1565922356-4488-1-git-send-email-yakui.zhao@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 operating system. On x86 it is implemented with the VMCALL instruction. Co-developed-by: Jason Chen CJ Signed-off-by: Jason Chen CJ Signed-off-by: Zhao Yakui --- arch/x86/include/asm/acrn.h | 54 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h index 857e6244..ab97c3d 100644 --- a/arch/x86/include/asm/acrn.h +++ b/arch/x86/include/asm/acrn.h @@ -11,4 +11,58 @@ extern void acrn_hv_vector_handler(struct pt_regs *regs); extern void acrn_setup_intr_irq(void (*handler)(void)); extern void acrn_remove_intr_irq(void); + +/* + * Hypercalls for ACRN guest + * + * Hypercall number is passed in R8 register. + * Up to 2 arguments are passed in RDI, RSI. + * Return value will be placed in RAX. + */ +static inline long acrn_hypercall0(unsigned long hcall_id) +{ + long result; + + /* the hypercall is implemented with the VMCALL instruction. + * volatile qualifier is added to avoid that it is dropped + * because of compiler optimization. + */ + asm volatile("movq %[hcall_id], %%r8\n\t" + "vmcall\n\t" + : "=a" (result) + : [hcall_id] "g" (hcall_id) + : "r8"); + + return result; +} + +static inline long acrn_hypercall1(unsigned long hcall_id, + unsigned long param1) +{ + long result; + + asm volatile("movq %[hcall_id], %%r8\n\t" + "vmcall\n\t" + : "=a" (result) + : [hcall_id] "g" (hcall_id), "D" (param1) + : "r8"); + + return result; +} + +static inline long acrn_hypercall2(unsigned long hcall_id, + unsigned long param1, + unsigned long param2) +{ + long result; + + asm volatile("movq %[hcall_id], %%r8\n\t" + "vmcall\n\t" + : "=a" (result) + : [hcall_id] "g" (hcall_id), "D" (param1), "S" (param2) + : "r8"); + + return result; +} + #endif /* _ASM_X86_ACRN_H */ -- 2.7.4