From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C3FBB258A; Wed, 9 Apr 2025 00:08:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744157327; cv=none; b=r6kc5AJOI0ch2yIzU+k32+ZYBvf7V89nbpRmtmlJUyesGqj9kIufCgezKp8ILLB6Le3l6d7E9nTcsqec8JozvUpJ5VM6EKxToIK4xUuMRm3K0n1bQUw7Q3Jjfz1DiYL6jHbyWT69O6i0Xg8gW0bdgyaNXDwOYrIy520YPCsU0tA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744157327; c=relaxed/simple; bh=TzegTHBmX8xpxC1koWbRZZ7J4AlrlbwynYjvHGR+LTg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dEj6/BB6qOslQClsJJUtVmoza/JtSEe633DUNO1IYOkNAtCZp+keRIe6Rlyf/2RVCU2AxvudIaUwaJG+piZpjFj7CXMk/l/WWFCEDQtitV7Z3h1deWbnrjzx4WKUvCbAE2qGDg1zrEi2SS+b+MAvIADMhkdkQuRZe/KkJ2rI4SA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=iDjCyAcd; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="iDjCyAcd" Received: from romank-3650.corp.microsoft.com (unknown [131.107.160.188]) by linux.microsoft.com (Postfix) with ESMTPSA id DB55B2113E9A; Tue, 8 Apr 2025 17:08:38 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com DB55B2113E9A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1744157319; bh=Sg3mxreQaraq/1ciAx/jhCP/Bmu4VLiaIgfdf0GaDc8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iDjCyAcdNbtLj7uwkih4ucfZviBCOPhMRJni3A2gBEGdAzqiBG9+Z045qKKz4haZo M+wg8LJ1F/RcW9TIpph1TemnfMJKPAVhHFbRUPRWMeSznV+HOQqS5bCe10gHFqiNLq kWbG3kEoYK/oYBnSVN3185sYekG5BnB01Osmt+sg= From: Roman Kisel To: aleksander.lobakin@intel.com, andriy.shevchenko@linux.intel.com, arnd@arndb.de, bp@alien8.de, catalin.marinas@arm.com, corbet@lwn.net, dakr@kernel.org, dan.j.williams@intel.com, dave.hansen@linux.intel.com, decui@microsoft.com, gregkh@linuxfoundation.org, haiyangz@microsoft.com, hch@lst.de, hpa@zytor.com, James.Bottomley@HansenPartnership.com, Jonathan.Cameron@huawei.com, kys@microsoft.com, leon@kernel.org, lukas@wunner.de, luto@kernel.org, m.szyprowski@samsung.com, martin.petersen@oracle.com, mingo@redhat.com, peterz@infradead.org, quic_zijuhu@quicinc.com, robin.murphy@arm.com, tglx@linutronix.de, wei.liu@kernel.org, will@kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, x86@kernel.org Cc: apais@microsoft.com, benhill@microsoft.com, bperkins@microsoft.com, sunilmut@microsoft.com Subject: [PATCH hyperv-next 3/6] arch: hyperv: Get/set SynIC synth.registers via paravisor Date: Tue, 8 Apr 2025 17:08:32 -0700 Message-ID: <20250409000835.285105-4-romank@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250409000835.285105-1-romank@linux.microsoft.com> References: <20250409000835.285105-1-romank@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The confidential VMBus is built on the guest talking to the paravisor only. Provide functions that allow manipulating the SynIC registers via paravisor. Signed-off-by: Roman Kisel --- arch/arm64/hyperv/mshyperv.c | 19 +++++++++++++++++++ arch/arm64/include/asm/mshyperv.h | 3 +++ arch/x86/include/asm/mshyperv.h | 3 +++ arch/x86/kernel/cpu/mshyperv.c | 28 ++++++++++++++++++++++++++++ 4 files changed, 53 insertions(+) diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c index 4e27cc29c79e..1647a57a3379 100644 --- a/arch/arm64/hyperv/mshyperv.c +++ b/arch/arm64/hyperv/mshyperv.c @@ -91,3 +91,22 @@ bool hv_is_hyperv_initialized(void) return hyperv_initialized; } EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); + +/* + * Not supported yet. + */ +u64 hv_pv_get_synic_register(unsigned int reg, int *err) +{ + *err = -ENODEV; + return !0ULL; +} +EXPORT_SYMBOL_GPL(hv_pv_get_synic_register); + +/* + * Not supported yet. + */ +int hv_pv_set_synic_register(unsigned int reg, u64 val) +{ + return -ENODEV; +} +EXPORT_SYMBOL_GPL(hv_pv_set_synic_register); diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h index b721d3134ab6..bce37a58dff0 100644 --- a/arch/arm64/include/asm/mshyperv.h +++ b/arch/arm64/include/asm/mshyperv.h @@ -53,6 +53,9 @@ static inline u64 hv_get_non_nested_msr(unsigned int reg) return hv_get_msr(reg); } +u64 hv_pv_get_synic_register(unsigned int reg, int *err); +int hv_pv_set_synic_register(unsigned int reg, u64 val); + /* SMCCC hypercall parameters */ #define HV_SMCCC_FUNC_NUMBER 1 #define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \ diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 07aadf0e839f..5650a16cc5e8 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -307,6 +307,9 @@ static __always_inline u64 hv_raw_get_msr(unsigned int reg) return __rdmsr(reg); } +u64 hv_pv_get_synic_register(unsigned int reg, int *err); +int hv_pv_set_synic_register(unsigned int reg, u64 val); + #else /* CONFIG_HYPERV */ static inline void hyperv_init(void) {} static inline void hyperv_setup_mmu_ops(void) {} diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 3e2533954675..4f6e3d02f730 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -89,6 +89,34 @@ void hv_set_non_nested_msr(unsigned int reg, u64 value) } EXPORT_SYMBOL_GPL(hv_set_non_nested_msr); +/* + * Not every paravisor supports getting SynIC registers, and + * this function may fail. The caller has to make sure that this function + * runs on the CPU of interest. + */ +u64 hv_pv_get_synic_register(unsigned int reg, int *err) +{ + if (!hv_is_synic_msr(reg)) { + *err = -ENODEV; + return !0ULL; + } + return native_read_msr_safe(reg, err); +} +EXPORT_SYMBOL_GPL(hv_pv_get_synic_register); + +/* + * Not every paravisor supports setting SynIC registers, and + * this function may fail. The caller has to make sure that this function + * runs on the CPU of interest. + */ +int hv_pv_set_synic_register(unsigned int reg, u64 val) +{ + if (!hv_is_synic_msr(reg)) + return -ENODEV; + return wrmsrl_safe(reg, val); +} +EXPORT_SYMBOL_GPL(hv_pv_set_synic_register); + u64 hv_get_msr(unsigned int reg) { if (hv_nested) -- 2.43.0