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([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id c14sm27323452pgv.86.2021.08.10.05.25.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Aug 2021 05:25:35 -0700 (PDT) Subject: Re: [PATCH V3 03/13] x86/HV: Add new hvcall guest address host visibility support To: Wei Liu References: <20210809175620.720923-1-ltykernel@gmail.com> <20210809175620.720923-4-ltykernel@gmail.com> <20210810110359.i4qodw7h36zrsicp@liuwe-devbox-debian-v2> From: Tianyu Lan Message-ID: <3a888810-69cf-fa4d-b374-2053432e1e56@gmail.com> Date: Tue, 10 Aug 2021 20:25:20 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <20210810110359.i4qodw7h36zrsicp@liuwe-devbox-debian-v2> Content-Language: en-US Cc: parri.andrea@gmail.com, linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, peterz@infradead.org, dave.hansen@linux.intel.com, vkuznets@redhat.com, hpa@zytor.com, kys@microsoft.com, will@kernel.org, boris.ostrovsky@oracle.com, linux-arch@vger.kernel.org, sfr@canb.auug.org.au, sstabellini@kernel.org, sthemmin@microsoft.com, xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org, aneesh.kumar@linux.ibm.com, x86@kernel.org, decui@microsoft.com, hch@lst.de, michael.h.kelley@microsoft.com, mingo@redhat.com, pgonda@google.com, rientjes@google.com, kuba@kernel.org, jejb@linux.ibm.com, martin.b.radev@gmail.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com, haiyangz@microsoft.com, bp@alien8.de, luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de, akpm@linux-foundation.org, jgross@suse.com, martin.petersen@oracle.com, saravanand@fb.com, netdev@vger.kernel.org, dave.hansen@intel.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, rppt@kernel.org, hannes@cmpxchg.org, tj@kernel.org, ardb@kernel.org, robin.murphy@arm.com, davem@davemloft.net, kirill.shutemov@linux.intel.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 8/10/2021 7:03 PM, Wei Liu wrote: >> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c >> index 0bb4d9ca7a55..b3683083208a 100644 >> --- a/arch/x86/hyperv/hv_init.c >> +++ b/arch/x86/hyperv/hv_init.c >> @@ -607,6 +607,12 @@ EXPORT_SYMBOL_GPL(hv_get_isolation_type); >> >> bool hv_is_isolation_supported(void) >> { >> + if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) >> + return 0; > Nit: false instead of 0. > OK. Will fix in the next version. >> +int hv_mark_gpa_visibility(u16 count, const u64 pfn[], >> + enum hv_mem_host_visibility visibility) >> +{ >> + struct hv_gpa_range_for_visibility **input_pcpu, *input; >> + u16 pages_processed; >> + u64 hv_status; >> + unsigned long flags; >> + >> + /* no-op if partition isolation is not enabled */ >> + if (!hv_is_isolation_supported()) >> + return 0; >> + >> + if (count > HV_MAX_MODIFY_GPA_REP_COUNT) { >> + pr_err("Hyper-V: GPA count:%d exceeds supported:%lu\n", count, >> + HV_MAX_MODIFY_GPA_REP_COUNT); >> + return -EINVAL; >> + } >> + >> + local_irq_save(flags); >> + input_pcpu = (struct hv_gpa_range_for_visibility **) >> + this_cpu_ptr(hyperv_pcpu_input_arg); >> + input = *input_pcpu; >> + if (unlikely(!input)) { >> + local_irq_restore(flags); >> + return -EINVAL; >> + } >> + >> + input->partition_id = HV_PARTITION_ID_SELF; >> + input->host_visibility = visibility; >> + input->reserved0 = 0; >> + input->reserved1 = 0; >> + memcpy((void *)input->gpa_page_list, pfn, count * sizeof(*pfn)); >> + hv_status = hv_do_rep_hypercall( >> + HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY, count, >> + 0, input, &pages_processed); >> + local_irq_restore(flags); >> + >> + if (!(hv_status & HV_HYPERCALL_RESULT_MASK)) >> + return 0; >> + >> + return hv_status & HV_HYPERCALL_RESULT_MASK; > Joseph introduced a few helper functions in 753ed9c95c37d. They will > make the code simpler. OK. Will update in the next version. Thanks. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu