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([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id s22sm2725797pfd.94.2021.06.10.07.18.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Jun 2021 07:18:59 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 7c33fb1a-a327-4caf-9934-b2c4a5bf7c47 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=S7U7wM1689XPFk0ln7YagGhi2kwC7oBCIYjLHGTATmA=; b=j1ssCm/VIao3T0Xc2kwXH6tQqWfrySQ1IoYffbIUZhSffD09z3SFuktT6padpAZaa/ O6dOSr9MfmJ3BaiaCjc0PA9hj1D56rpnhXvTnUEKbRnxOiqwlkMuTGEQqMho8+laNO3A Ps4g2Ewhuj5lqgG3+vb3Pr6h4xORMt0ouVqwcSeoFvA+lTlqRvdEpC++3hJnHyetmZQS Y1STui7T1ekgTq6zzEkx3p9dSbyB7UT0DfPgF2o16fgVpJiH+bKr87Q/n9chxbr1Li1Z sUz1mgnrmF2Vvd/rNoSeF09YxbBnVBhhC9qN6Rqm62kNLgrUCEgGYVPXMjW1fXotfIvd p8kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=S7U7wM1689XPFk0ln7YagGhi2kwC7oBCIYjLHGTATmA=; b=jDvl5refJGckccdKBFeY+r2ikeF442cIUkMqZrJIL8yIRyBuokKB+w5G1ziKHnu8CB 03+vgpscPz12ZXeA+e/FhdroUkr7aOdGCPN1sKn//OmfUvYnIlbjiyGhMzeFel6OmGTO d51lK4i+RpUGhY4O3ouAiDGWuA7ane1TvucUt5W/eDiG2HQknX1/brbGFb0i3eeSfNGe wvWp3/EuQhm/mos9jOIkXkymTVj3j5hud3UCFVHRo7FtlxXPKWQoZ98OLOupaPXZubF+ IPsv/dZ2BqN7xpzywdV3R7snCb7NzjjLfyT8gByiHI1kY+HxUgcbR58FukuBIPjYueNJ QLYQ== X-Gm-Message-State: AOAM5310w1x5B4OqX2JMCa+vDl2xOmKCvPXMQZHVITONtBwZZHbVJ/46 tTTgxkxQp2UM5PqlQwTJta4= X-Google-Smtp-Source: ABdhPJykpYU7kOZkoptn+vRUH+LpqhlVAnDQIkp8KIQpRwT8RFYkpZNT1LtsR90ESObN7s+cfunBTA== X-Received: by 2002:a63:7404:: with SMTP id p4mr5123864pgc.405.1623334740224; Thu, 10 Jun 2021 07:19:00 -0700 (PDT) Subject: Re: [RFC PATCH V3 03/11] x86/Hyper-V: Add new hvcall guest address host visibility support To: Vitaly Kuznetsov , kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-4-ltykernel@gmail.com> <878s3iyrtg.fsf@vitty.brq.redhat.com> From: Tianyu Lan Message-ID: <2a0170a9-e4d5-1c63-7901-416094f6ab64@gmail.com> Date: Thu, 10 Jun 2021 22:18:45 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <878s3iyrtg.fsf@vitty.brq.redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Hi Vitaly: Thanks for your review. On 6/10/2021 5:47 PM, Vitaly Kuznetsov wrote: >> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h >> index 606f5cc579b2..632281b91b44 100644 >> --- a/arch/x86/include/asm/hyperv-tlfs.h >> +++ b/arch/x86/include/asm/hyperv-tlfs.h >> @@ -262,6 +262,17 @@ enum hv_isolation_type { >> #define HV_X64_MSR_TIME_REF_COUNT HV_REGISTER_TIME_REF_COUNT >> #define HV_X64_MSR_REFERENCE_TSC HV_REGISTER_REFERENCE_TSC >> >> +/* Hyper-V GPA map flags */ >> +#define HV_MAP_GPA_PERMISSIONS_NONE 0x0 >> +#define HV_MAP_GPA_READABLE 0x1 >> +#define HV_MAP_GPA_WRITABLE 0x2 >> + >> +enum vmbus_page_visibility { >> + VMBUS_PAGE_NOT_VISIBLE = 0, >> + VMBUS_PAGE_VISIBLE_READ_ONLY = 1, >> + VMBUS_PAGE_VISIBLE_READ_WRITE = 3 >> +}; >> + > Why do we need both flags and the enum? I don't see HV_MAP_GPA_* being > used anywhere and VMBUS_PAGE_VISIBLE_READ_WRITE looks like > HV_MAP_GPA_READABLE | HV_MAP_GPA_WRITABLE. > > As this is used to communicate with the host, I'd suggest to avoid using > enum and just use flags everywhere. > Nice catch. Will update in the next version. Thanks.