From patchwork Tue May 14 22:43:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Kisel X-Patchwork-Id: 13664471 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 87B63C25B78 for ; Tue, 14 May 2024 22:45:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NKkLtfhglJnZm65N8AiEyrOp2mV+PmUn1t7x+tmOl1I=; b=y4zuv+DQ8dnDPw SVO8AUggU7M1SsKpLd6zJZffeuLrB9jt7fuTQsYVTStPBwynypcvyi1p58qiPd7rU8w8K7hJWqi0Y 11Tl5eSKYeNAmtbQYj6dJLDkMxQ9pmjuKBViImBYwreCTytUno34sttJazKjTn2vhp0OXuXBigIpp IaXNEVPEmcjpbWmJj7WDAXuC+f3decsItykJeud+1zLiDYqOXM8+h5+GhQQRE35t/MYIBi1IXJRI8 Z80jpsa2J4ZFBhbOzq2OndVcFtkyRG+CWZmfpQCWe/CN/jeR8whwy9exO7pGqvLidhW35YOr73awo +NQCgKkgZU8eBLsJ29iQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s70tr-0000000HNQI-3SDP; Tue, 14 May 2024 22:45:35 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s70tg-0000000HNJO-3GkU for linux-arm-kernel@lists.infradead.org; Tue, 14 May 2024 22:45:27 +0000 Received: from xps-8930.corp.microsoft.com (unknown [131.107.160.48]) by linux.microsoft.com (Postfix) with ESMTPSA id 6F5322095D0D; Tue, 14 May 2024 15:45:21 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 6F5322095D0D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1715726721; bh=Y0tR2xyoixzhkEx06dVg/oDnKDEQYYiPMVX6g/T4ShY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rIpAff7UkIDHiq6Mq4q1zztwKhl0claML4lN9OOwLOcvFsTwJrZ+RnSGisArmq2OJ OdKFDT5MnLFdxI5NE6hahsMqvHdDhbyO/dvLiJppDgTlFIEO3HXVsmWhCDKHI3kkyY owo+nab6bj4JhWhVbcD6ktPohOr7G8JOHuYmQ1C8= From: Roman Kisel To: arnd@arndb.de, bhelgaas@google.com, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, hpa@zytor.com, kw@linux.com, kys@microsoft.com, lenb@kernel.org, lpieralisi@kernel.org, mingo@redhat.com, mhklinux@outlook.com, rafael@kernel.org, robh@kernel.org, tglx@linutronix.de, wei.liu@kernel.org, will@kernel.org, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Cc: ssengar@microsoft.com, sunilmut@microsoft.com, vdso@hexbites.dev Subject: [PATCH v2 3/6] drivers/hv: arch-neutral implementation of get_vtl() Date: Tue, 14 May 2024 15:43:50 -0700 Message-ID: <20240514224508.212318-4-romank@linux.microsoft.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240514224508.212318-1-romank@linux.microsoft.com> References: <20240514224508.212318-1-romank@linux.microsoft.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240514_154525_072246_E3AC4A85 X-CRM114-Status: GOOD ( 21.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org To run in the VTL mode, Hyper-V drivers have to know what VTL the system boots in, and the arm64/hyperv code does not have the means to compute that. Refactor the code to hoist the function that detects VTL, make it arch-neutral to be able to employ it to get the VTL on arm64. Signed-off-by: Roman Kisel --- arch/x86/hyperv/hv_init.c | 34 ----------------------- arch/x86/include/asm/hyperv-tlfs.h | 7 ----- drivers/hv/hv_common.c | 43 ++++++++++++++++++++++++++++++ include/asm-generic/hyperv-tlfs.h | 7 +++++ include/asm-generic/mshyperv.h | 6 +++++ 5 files changed, 56 insertions(+), 41 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 17a71e92a343..c350fa05ee59 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -413,40 +413,6 @@ static void __init hv_get_partition_id(void) local_irq_restore(flags); } -#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE) -static u8 __init get_vtl(void) -{ - u64 control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_REGISTERS; - struct hv_get_vp_registers_input *input; - struct hv_get_vp_registers_output *output; - unsigned long flags; - u64 ret; - - local_irq_save(flags); - input = *this_cpu_ptr(hyperv_pcpu_input_arg); - output = (struct hv_get_vp_registers_output *)input; - - memset(input, 0, struct_size(input, element, 1)); - input->header.partitionid = HV_PARTITION_ID_SELF; - input->header.vpindex = HV_VP_INDEX_SELF; - input->header.inputvtl = 0; - input->element[0].name0 = HV_X64_REGISTER_VSM_VP_STATUS; - - ret = hv_do_hypercall(control, input, output); - if (hv_result_success(ret)) { - ret = output->as64.low & HV_X64_VTL_MASK; - } else { - pr_err("Failed to get VTL(error: %lld) exiting...\n", ret); - BUG(); - } - - local_irq_restore(flags); - return ret; -} -#else -static inline u8 get_vtl(void) { return 0; } -#endif - /* * This function is to be invoked early in the boot sequence after the * hypervisor has been detected. diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 3787d26810c1..9ee68eb8e6ff 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -309,13 +309,6 @@ enum hv_isolation_type { #define HV_MSR_STIMER0_CONFIG (HV_X64_MSR_STIMER0_CONFIG) #define HV_MSR_STIMER0_COUNT (HV_X64_MSR_STIMER0_COUNT) -/* - * Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and - * there is not associated MSR address. - */ -#define HV_X64_REGISTER_VSM_VP_STATUS 0x000D0003 -#define HV_X64_VTL_MASK GENMASK(3, 0) - /* Hyper-V memory host visibility */ enum hv_mem_host_visibility { VMBUS_PAGE_NOT_VISIBLE = 0, diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index dde3f9b6871a..d4cf477a4d0c 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -660,3 +660,46 @@ u64 __weak hv_tdx_hypercall(u64 control, u64 param1, u64 param2) return HV_STATUS_INVALID_PARAMETER; } EXPORT_SYMBOL_GPL(hv_tdx_hypercall); + +#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE) +u8 __init get_vtl(void) +{ + u64 control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_REGISTERS; + struct hv_get_vp_registers_input *input; + struct hv_get_vp_registers_output *output; + unsigned long flags; + u64 ret; + + local_irq_save(flags); + input = *this_cpu_ptr(hyperv_pcpu_input_arg); + output = (struct hv_get_vp_registers_output *)input; + + memset(input, 0, struct_size(input, element, 1)); + input->header.partitionid = HV_PARTITION_ID_SELF; + input->header.vpindex = HV_VP_INDEX_SELF; + input->header.inputvtl = 0; + input->element[0].name0 = HV_REGISTER_VSM_VP_STATUS; + + ret = hv_do_hypercall(control, input, output); + if (hv_result_success(ret)) { + ret = output->as64.low & HV_VTL_MASK; + } else { + pr_err("Failed to get VTL(error: %lld) exiting...\n", ret); + + /* + * This is a dead end, something fundamental is broken. + * + * There is no sensible way of continuing as the Hyper-V drivers + * transitively depend via the vmbus driver on knowing which VTL + * they run in to establish communication with the host. The kernel + * is going to be worse off if continued booting than a panicked one, + * just hung and stuck, producing second-order failures, with neither + * a way to recover nor to provide expected services. + */ + BUG(); + } + + local_irq_restore(flags); + return ret; +} +#endif diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index 87e3d49a4e29..682bcda3124f 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -75,6 +75,13 @@ /* AccessTscInvariantControls privilege */ #define HV_ACCESS_TSC_INVARIANT BIT(15) +/* + * This synthetic register is only accessible via the HVCALL_GET_VP_REGISTERS + * hvcall, and there is no an associated MSR on x86. + */ +#define HV_REGISTER_VSM_VP_STATUS 0x000D0003 +#define HV_VTL_MASK GENMASK(3, 0) + /* * Group B features. */ diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 99935779682d..ea434186d765 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -301,4 +301,10 @@ static inline enum hv_isolation_type hv_get_isolation_type(void) } #endif /* CONFIG_HYPERV */ +#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE) +u8 __init get_vtl(void); +#else +static inline u8 get_vtl(void) { return 0; } +#endif + #endif