From patchwork Thu Dec 1 11:03:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinank Jain X-Patchwork-Id: 28320 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:f944:0:0:0:0:0 with SMTP id q4csp196920wrr; Thu, 1 Dec 2022 03:06:49 -0800 (PST) X-Google-Smtp-Source: AA0mqf6Uv75w3j45YE4tZLpqkqFDKHBrOUqjRFCvDhvH4RggT66SdlaNfR2+eNG7JrOKEexnMog3 X-Received: by 2002:a50:aa8f:0:b0:469:c5cc:855e with SMTP id q15-20020a50aa8f000000b00469c5cc855emr46323599edc.307.1669892809284; Thu, 01 Dec 2022 03:06:49 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1669892809; cv=none; d=google.com; s=arc-20160816; b=BTqXEOlHzy9RC8CgAbOit0cvDn/TCbJl6zn4ogFGC24k0vS+UrbawOdvvzUEkA4bN2 qAt+5pekDaqEM7aXDH3rLLko9MPk/ksAFwvIYx/0YBrbacyIaAySewf/7iNcmEW/u7VI ogLkPxmso9nfm/MlC5jIDvK7L3476pS+i9e36vANq5UmnvXvAHEWV1MkFKHbR512bRr3 cx8ZS8cd+Vj5h/DUjKzx41qi21FyjEgjq9PPK/xJkqSI89rWxy8SQ9tiaEHOFk7sPElb 8EXzI9DeZCaNGQhdvwAuaVrza9q5q/o9T52ulWfL9VBfF/StYYDinp89hhCFAF/splQX xIVg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:dkim-filter; bh=0XXpwjMaWgOBfkprXGejLOu/IxffncbvZikzfYyKED0=; b=kfA9yUL2iEPbKLWSocUsCus/IKAEpeg/u6VZIfbZKGZhJVroRRQ7O8OFxmOp7Nl5+A 5yoTKEDA10oU8ika+sG5Jb+Sn6vdGXtfYhPRllpf4c1li086LXfNA9KhNCnpqit3GQav 8pnb1emWn7bb3DvPxUlGDcgCLnMN87Ka3HB89anYt9ZrrQJkkmvQ+IgdTBc5vw/XqAe6 Klhlk5ELFPHvaWrv6paSXVBZrlWy+faq3idDDMZMZoKHvfoGUG0aB47oCIHJUQFBjLvd 09NhRpvSVI5t9NO6HAt7dcLfUrXCBnfw5ax/62/G4UQFUGrOiEZ7OPB2fSFFu0qvWiDy U30A== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=AC4W4BPZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id hb11-20020a170907160b00b007bfacfbd8aesi4150901ejc.133.2022.12.01.03.06.16; Thu, 01 Dec 2022 03:06:49 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=AC4W4BPZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230517AbiLALFI (ORCPT + 99 others); Thu, 1 Dec 2022 06:05:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230508AbiLALEM (ORCPT ); Thu, 1 Dec 2022 06:04:12 -0500 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D78CF13D20; Thu, 1 Dec 2022 03:04:02 -0800 (PST) Received: from jinankjain-dranzer.zrrkmle5drku1h0apvxbr2u2ee.ix.internal.cloudapp.net (unknown [20.188.121.5]) by linux.microsoft.com (Postfix) with ESMTPSA id B82CD20B83DC; Thu, 1 Dec 2022 03:03:57 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com B82CD20B83DC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1669892642; bh=0XXpwjMaWgOBfkprXGejLOu/IxffncbvZikzfYyKED0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AC4W4BPZx8Nia0TS5K7t6HTAeL8KJJyOoQo2ob88pdXSz8ZB8tk1tMe20QNqutma1 ALAaPF+MUaMhukj0un16TJEzxvEAtnttZT9NbmqOhzvZkAuXL01twIpkFDE2M2StMf X08L3FxRR2MlKH9YbKzZdraj71Yjl8QIqu4hs740= From: Jinank Jain To: jinankjain@microsoft.com Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, peterz@infradead.org, jpoimboe@kernel.org, jinankjain@linux.microsoft.com, seanjc@google.com, kirill.shutemov@linux.intel.com, ak@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, anrayabh@linux.microsoft.com, mikelley@microsoft.com Subject: [PATCH v7 3/5] x86/hyperv: Add an interface to do nested hypercalls Date: Thu, 1 Dec 2022 11:03:37 +0000 Message-Id: <0714327373829ec0fc372b78ac3f55c23b1417af.1669788587.git.jinankjain@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-Spam-Status: No, score=-19.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_MED, SPF_HELO_PASS,SPF_PASS,USER_IN_DEF_DKIM_WL,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751009522720612767?= X-GMAIL-MSGID: =?utf-8?q?1751009522720612767?= According to TLFS, in order to communicate to L0 hypervisor there needs to be an additional bit set in the control register. This communication is required to perform privileged instructions which can only be performed by L0 hypervisor. An example of that could be setting up the VMBus infrastructure. Signed-off-by: Jinank Jain --- arch/x86/include/asm/hyperv-tlfs.h | 3 ++- arch/x86/include/asm/mshyperv.h | 42 +++++++++++++++++++++++++++--- include/asm-generic/hyperv-tlfs.h | 1 + 3 files changed, 41 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index b5019becb618..7758c495541d 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -380,7 +380,8 @@ struct hv_nested_enlightenments_control { __u32 reserved:31; } features; struct { - __u32 reserved; + __u32 inter_partition_comm:1; + __u32 reserved:31; } hypercallControls; } __packed; diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 3197d49c888c..fbd7a9589b0d 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -74,10 +74,16 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) return hv_status; } +/* Hypercall to the L0 hypervisor */ +static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) +{ + return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); +} + /* Fast hypercall with 8 bytes of input and no output */ -static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) +static inline u64 _hv_do_fast_hypercall8(u64 control, u16 code, u64 input1) { - u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; + u64 hv_status; #ifdef CONFIG_X86_64 { @@ -105,10 +111,24 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) return hv_status; } +static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; + + return _hv_do_fast_hypercall8(control, code, input1); +} + +static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; + + return _hv_do_fast_hypercall8(control, code, input1); +} + /* Fast hypercall with 16 bytes of input */ -static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) +static inline u64 _hv_do_fast_hypercall16(u64 control, u16 code, u64 input1, u64 input2) { - u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; + u64 hv_status; #ifdef CONFIG_X86_64 { @@ -139,6 +159,20 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) return hv_status; } +static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; + + return _hv_do_fast_hypercall16(control, code, input1, input2); +} + +static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; + + return _hv_do_fast_hypercall16(control, code, input1, input2); +} + extern struct hv_vp_assist_page **hv_vp_assist_page; static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index b17c6eeb9afa..e61ee461c4fc 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -194,6 +194,7 @@ enum HV_GENERIC_SET_FORMAT { #define HV_HYPERCALL_VARHEAD_OFFSET 17 #define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17) #define HV_HYPERCALL_RSVD0_MASK GENMASK_ULL(31, 27) +#define HV_HYPERCALL_NESTED BIT_ULL(31) #define HV_HYPERCALL_REP_COMP_OFFSET 32 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32)