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 BC566C197BF for ; Fri, 28 Feb 2025 00:23:01 +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:Cc:To:Subject: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=FG1ZBKIPXWfRyJjLzpGwfkd5Koln2BbLJ0dDMgqjeDg=; b=S5tXY3zDbRwOb0lTRZIKsR3lL6 HTpeCBqbtmKQYTol/uZfUJOfqOMtf0jz+yX3f8RaUt2U7logp5fq9S1js50+HWXS9fy4yl/q1eVqM +epeJNIN2jHI9RBGnfaW3r778w2UG9fHeb9+5BWQI0jrAx855DgARhf38M9JWroKaw71ELFuppi26 ambhtT4b5OAQmIcbE4WAjPK2hx8bFh6huEe5MKBM9w+9ihk5v52Bm4vS0497Jj4bEqRaM7bkl2HxW 6UP6zUBfUHwY5KB1+ItJ8tlFOGtGlAmYGx6dEqGlhbGohdgYsXjexOk/63IVCtWAP/FiEtdLybQUg aL9PA/IQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tno9V-00000009GFW-2uSj; Fri, 28 Feb 2025 00:22:53 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tno7w-00000009G05-2rL6 for linux-arm-kernel@lists.infradead.org; Fri, 28 Feb 2025 00:21:17 +0000 Received: from [10.0.0.114] (c-67-182-156-199.hsd1.wa.comcast.net [67.182.156.199]) by linux.microsoft.com (Postfix) with ESMTPSA id F0457210EAC1; Thu, 27 Feb 2025 16:21:14 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com F0457210EAC1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1740702075; bh=FG1ZBKIPXWfRyJjLzpGwfkd5Koln2BbLJ0dDMgqjeDg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=A6CE6ACRJ6xPFiBrMIXA6tb3zCN+5558HuL1iwi46kRcOnedTubY9GUrM162KGITh WKS4qN8VB6jPXzh4TMGLdT6z18yRAh7BIv0UZ+ToMBk0o5B01NPu7wFUnF21e/147E 7I1V64WZ33welLUDHzQUfOwYnSg6MuhkHn0H0zYY= Message-ID: <2fee888a-4f81-40aa-9545-617a49a7fb30@linux.microsoft.com> Date: Thu, 27 Feb 2025 16:21:14 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 03/10] arm64/hyperv: Add some missing functions to arm64 To: Easwar Hariharan 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, 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 References: <1740611284-27506-1-git-send-email-nunodasneves@linux.microsoft.com> <1740611284-27506-4-git-send-email-nunodasneves@linux.microsoft.com> <5f3d660d-fe2e-4ac1-94a7-66d6c8ffe579@linux.microsoft.com> Content-Language: en-US From: Nuno Das Neves In-Reply-To: <5f3d660d-fe2e-4ac1-94a7-66d6c8ffe579@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-20250227_162116_774837_B446ED4B X-CRM114-Status: GOOD ( 19.57 ) 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 9:56 PM, Easwar Hariharan wrote: > 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* > > Thanks! >> 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. > Good point, I don't see a good reason this can't be in the header. >> /* >> * 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 > Good point, missed that one... >> +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? > Yes I wondered about that warning. That's true, if I just put it in the arm64 header then this won't be needed at all, so I might just do that! >> bool hv_isolation_type_snp(void); >> bool hv_isolation_type_tdx(void); >>