From patchwork Wed Apr 14 14:49:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 12203077 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,USER_AGENT_GIT autolearn=unavailable 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 65B02C43461 for ; Wed, 14 Apr 2021 14:50:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 430B661220 for ; Wed, 14 Apr 2021 14:50:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352010AbhDNOu5 (ORCPT ); Wed, 14 Apr 2021 10:50:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38920 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351957AbhDNOuv (ORCPT ); Wed, 14 Apr 2021 10:50:51 -0400 Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BFE30C06175F; Wed, 14 Apr 2021 07:50:29 -0700 (PDT) Received: by mail-pg1-x532.google.com with SMTP id t22so14611111pgu.0; Wed, 14 Apr 2021 07:50:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=a/EDNIO90x+e8AFI7mOKhNKA82m+L7igtpPovmD+rhw=; b=fm6CEGbsAMSfOKQ0+U7jTSCU69Q/Jdxm8mK6rFCM9gsDglj1XVWQGjeCyw+ATWyFhB XOwSGA9F7r5iEo5NUIpOie2H5axtYlGJFeRScNRcNgL1Vj3HIzTwwVIRUXXFmV14bsU/ luUs4mo/+E6UFDaDTOXfHEmzzgJKMHv6pCTCFRT1gfrhDw4F/GLGzv3F6iZRbmTan39l jyR+18wObZr28Z7CxyvIIVbJF+Xl6p9yOOqtAmjzORgvBEY2rUtNdk/FQ9mEmbKX+BpZ JhIxFQPmU6hRwNTP02ghT7RFg0IInpZ+2LkxKJL/vlnwNxgbuFtNCQFFW2X83yX2pcK0 AhGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=a/EDNIO90x+e8AFI7mOKhNKA82m+L7igtpPovmD+rhw=; b=hEE/wfPrQ+21UEsr4MfMx272lb8FGnWtB5FFW4jf8f3O92E53BDHszUj49fNAwc1nq epjFkH1PAT61N3axnTkULjP9P3c93d3IGivfZVC8IhMTeTp0pHjtTpbeYrLtTGp+/RKd 328W43541MHbBcybIjkIMVaakUnZ7ZbmZDVeJJQ3ecE/g2D2rqjGOs1mAP7OluZoFCw4 XJwCIU5zqYiT74/Roo40GBe+vrKhM+vy42/CuuLSq1kdC9ZchJ+iPDpcH6w34hNY11bM 5h8Qoh70cQgiC2T3wzLCgTxjkoFxotDc8wsBLxNat9vbSfPPYEDkKi8yHkQjiFInirZ1 TTzA== X-Gm-Message-State: AOAM533+4E/PJqNfbKRWM+lm3BaDh8uCjixB8wCWqAIcuEDICmMUCRLf YBA4Z0dIts3lFnbJ1jc696E= X-Google-Smtp-Source: ABdhPJz4Mcv4+AWZTLNcrQH1pgpMGbOS+rHmkbuYkxqX8ZUry/+RhEuiyE8vNgkOAmPPyHY1FCOteg== X-Received: by 2002:a62:5c6:0:b029:24d:e97f:1b1d with SMTP id 189-20020a6205c60000b029024de97f1b1dmr13734445pff.40.1618411829236; Wed, 14 Apr 2021 07:50:29 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:35:ebad:12c1:f579:e332]) by smtp.gmail.com with ESMTPSA id w67sm17732522pgb.87.2021.04.14.07.50.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Apr 2021 07:50:28 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, akpm@linux-foundation.org, gregkh@linuxfoundation.org, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: Tianyu Lan , iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [Resend RFC PATCH V2 05/12] HV: Add ghcb hvcall support for SNP VM Date: Wed, 14 Apr 2021 10:49:38 -0400 Message-Id: <20210414144945.3460554-6-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210414144945.3460554-1-ltykernel@gmail.com> References: <20210414144945.3460554-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V provides ghcb hvcall to handle VMBus HVCALL_SIGNAL_EVENT and HVCALL_POST_MESSAGE msg in SNP Isolation VM. Add such support. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/ivm.c | 69 +++++++++++++++++++++++++++++++++ arch/x86/include/asm/mshyperv.h | 1 + drivers/hv/connection.c | 6 ++- drivers/hv/hv.c | 8 +++- 4 files changed, 82 insertions(+), 2 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 2ec64b367aaf..0ad73ea60c8f 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -18,8 +18,77 @@ union hv_ghcb { struct ghcb ghcb; + struct { + u64 hypercalldata[509]; + u64 outputgpa; + union { + union { + struct { + u32 callcode : 16; + u32 isfast : 1; + u32 reserved1 : 14; + u32 isnested : 1; + u32 countofelements : 12; + u32 reserved2 : 4; + u32 repstartindex : 12; + u32 reserved3 : 4; + }; + u64 asuint64; + } hypercallinput; + union { + struct { + u16 callstatus; + u16 reserved1; + u32 elementsprocessed : 12; + u32 reserved2 : 20; + }; + u64 asunit64; + } hypercalloutput; + }; + u64 reserved2; + } hypercall; } __packed __aligned(PAGE_SIZE); +u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size) +{ + union hv_ghcb *hv_ghcb; + void **ghcb_base; + unsigned long flags; + + if (!ms_hyperv.ghcb_base) + return -EFAULT; + + local_irq_save(flags); + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + hv_ghcb = (union hv_ghcb *)*ghcb_base; + if (!hv_ghcb) { + local_irq_restore(flags); + return -EFAULT; + } + + memset(hv_ghcb, 0x00, HV_HYP_PAGE_SIZE); + hv_ghcb->ghcb.protocol_version = 1; + hv_ghcb->ghcb.ghcb_usage = 1; + + hv_ghcb->hypercall.outputgpa = (u64)output; + hv_ghcb->hypercall.hypercallinput.asuint64 = 0; + hv_ghcb->hypercall.hypercallinput.callcode = control; + + if (input_size) + memcpy(hv_ghcb->hypercall.hypercalldata, input, input_size); + + VMGEXIT(); + + hv_ghcb->ghcb.ghcb_usage = 0xffffffff; + memset(hv_ghcb->ghcb.save.valid_bitmap, 0, + sizeof(hv_ghcb->ghcb.save.valid_bitmap)); + + local_irq_restore(flags); + + return hv_ghcb->hypercall.hypercalloutput.callstatus; +} +EXPORT_SYMBOL_GPL(hv_ghcb_hypercall); + void hv_ghcb_msr_write(u64 msr, u64 value) { union hv_ghcb *hv_ghcb; diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 73501dbbc240..929504fe8654 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -318,6 +318,7 @@ void hv_sint_rdmsrl_ghcb(u64 msr, u64 *value); void hv_signal_eom_ghcb(void); void hv_ghcb_msr_write(u64 msr, u64 value); void hv_ghcb_msr_read(u64 msr, u64 *value); +u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size); #define hv_get_synint_state_ghcb(int_num, val) \ hv_sint_rdmsrl_ghcb(HV_X64_MSR_SINT0 + int_num, val) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index c83612cddb99..79bca653dce9 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -442,6 +442,10 @@ void vmbus_set_event(struct vmbus_channel *channel) ++channel->sig_events; - hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event); + if (hv_isolation_type_snp()) + hv_ghcb_hypercall(HVCALL_SIGNAL_EVENT, &channel->sig_event, + NULL, sizeof(u64)); + else + hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event); } EXPORT_SYMBOL_GPL(vmbus_set_event); diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 069530eeb7c6..bff7c9049ffb 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -60,7 +60,13 @@ int hv_post_message(union hv_connection_id connection_id, aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); + if (hv_isolation_type_snp()) + status = hv_ghcb_hypercall(HVCALL_POST_MESSAGE, + (void *)aligned_msg, NULL, + sizeof(struct hv_input_post_message)); + else + status = hv_do_hypercall(HVCALL_POST_MESSAGE, + aligned_msg, NULL); /* Preemption must remain disabled until after the hypercall * so some other thread can't get scheduled onto this cpu and