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 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 25FFAC19F2E for ; Thu, 27 Feb 2025 05:59:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:To:Subject:Cc:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=W/MkXUhHX7zH6oQ/rHTcpceutPj8HQjNkQ+KPUdG8HE=; b=wn/lplBHVt84q0ffsbfXZKIFG2 D2asyoSFza8o8gNYsnJ8OV66PH6FNWETe7o8hVIhn6ylpjZdHtWLLR0mK7YoI5jrwyljEmvpV3evK OvflbPu2MHYab+4uyHNksIv8tmCdEM4Tq8/jg4YY2eWS2QvQCc9ym85lsvHolII6QQZ0eNE2UkWst bBC5frzocf/7A4RQ33S6LPZBV2/ufsIhfLPc/OXYgLZO+/yquZPTuhEDmgMvObjXtixbR1igBs4Sz iURTETZiXUg4hnqC2stniH1gRgUk2mj4gQcZA0dB7ZYv9Lz1xVqeAcCY6uJMuKmqxGWZHTSFQUo41 /XZv3RmA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnWvk-00000006Qkv-47ek; Thu, 27 Feb 2025 05:59:32 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnWtJ-00000006QO6-10Oh for linux-arm-kernel@lists.infradead.org; Thu, 27 Feb 2025 05:57:02 +0000 Received: from [100.65.224.197] (unknown [20.236.11.29]) by linux.microsoft.com (Postfix) with ESMTPSA id 91976210C33B; Wed, 26 Feb 2025 21:56:58 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 91976210C33B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1740635819; bh=W/MkXUhHX7zH6oQ/rHTcpceutPj8HQjNkQ+KPUdG8HE=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=eQI4y+Ht6gcca5/C4U2sEvpTwt7K8Tzgnteh+WyGhNwCTshnKA0XUsTDM9eYfZeIh QjkJYSyHomtHB13FhD0M5CcZVt7UgmmGKqHH++pn/K4lVYxywy06xenvAsZSRgtPnE PIn+AldosomUdd9VeWpBXVnsKZVDKLcOS1bKbEns= Message-ID: <5f3d660d-fe2e-4ac1-94a7-66d6c8ffe579@linux.microsoft.com> Date: Wed, 26 Feb 2025 21:56:56 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: linux-hyperv@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-acpi@vger.kernel.org, eahariha@linux.microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, decui@microsoft.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@linaro.org, joro@8bytes.org, robin.murphy@arm.com, arnd@arndb.de, jinankjain@linux.microsoft.com, muminulrussell@gmail.com, skinsburskii@linux.microsoft.com, mrathor@linux.microsoft.com, ssengar@linux.microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, stanislav.kinsburskiy@gmail.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, muislam@microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net Subject: Re: [PATCH v5 03/10] arm64/hyperv: Add some missing functions to arm64 To: Nuno Das Neves References: <1740611284-27506-1-git-send-email-nunodasneves@linux.microsoft.com> <1740611284-27506-4-git-send-email-nunodasneves@linux.microsoft.com> From: Easwar Hariharan Content-Language: en-US In-Reply-To: <1740611284-27506-4-git-send-email-nunodasneves@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250226_215701_335660_C4C7C163 X-CRM114-Status: GOOD ( 19.31 ) 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 On 2/26/2025 3:07 PM, Nuno Das Neves wrote: > These non-nested msr and fast hypercall functions are present in x86, > but they must be available in both architetures for the root partition nit: *architectures* > driver code. > > Signed-off-by: Nuno Das Neves > --- > arch/arm64/hyperv/hv_core.c | 17 +++++++++++++++++ > arch/arm64/include/asm/mshyperv.h | 12 ++++++++++++ > include/asm-generic/mshyperv.h | 2 ++ > 3 files changed, 31 insertions(+) > > diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c > index 69004f619c57..e33a9e3c366a 100644 > --- a/arch/arm64/hyperv/hv_core.c > +++ b/arch/arm64/hyperv/hv_core.c > @@ -53,6 +53,23 @@ u64 hv_do_fast_hypercall8(u16 code, u64 input) > } > EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8); > > +/* > + * hv_do_fast_hypercall16 -- Invoke the specified hypercall > + * with arguments in registers instead of physical memory. > + * Avoids the overhead of virt_to_phys for simple hypercalls. > + */ > +u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) > +{ > + struct arm_smccc_res res; > + u64 control; > + > + control = (u64)code | HV_HYPERCALL_FAST_BIT; > + > + arm_smccc_1_1_hvc(HV_FUNC_ID, control, input1, input2, &res); > + return res.a0; > +} > +EXPORT_SYMBOL_GPL(hv_do_fast_hypercall16); > + I'd like this to have been in arch/arm64/include/asm/mshyperv.h like its x86 counterpart, but that's just my personal liking of symmetry. I see why it's here with its slow and 8-byte brethren. > /* > * Set a single VP register to a 64-bit value. > */ > diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h > index 2e2f83bafcfb..2a900ba00622 100644 > --- a/arch/arm64/include/asm/mshyperv.h > +++ b/arch/arm64/include/asm/mshyperv.h > @@ -40,6 +40,18 @@ static inline u64 hv_get_msr(unsigned int reg) > return hv_get_vpreg(reg); > } > > +/* > + * Nested is not supported on arm64 > + */ > +static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) > +{ > + hv_set_msr(reg, value); > +} empty line preferred here, also reported by checkpatch > +static inline u64 hv_get_non_nested_msr(unsigned int reg) > +{ > + return hv_get_msr(reg); > +} > + > /* SMCCC hypercall parameters */ > #define HV_SMCCC_FUNC_NUMBER 1 > #define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \ > diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h > index c020d5d0ec2a..258034dfd829 100644 > --- a/include/asm-generic/mshyperv.h > +++ b/include/asm-generic/mshyperv.h > @@ -72,6 +72,8 @@ extern void * __percpu *hyperv_pcpu_output_arg; > > extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); > extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); > +extern u64 hv_do_fast_hypercall16(u16 control, u64 input1, u64 input2); > + checkpatch warns against putting externs in header files, and FWIW, if hv_do_fast_hypercall16() for arm64 were in arch/arm64/include/asm/mshyperv.h like its x86 counterpart, you probably wouldn't need this? > bool hv_isolation_type_snp(void); > bool hv_isolation_type_tdx(void); >