From: Tianyu Lan <ltykernel@gmail.com>
To: "Michael Kelley (LINUX)" <mikelley@microsoft.com>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
"wei.liu@kernel.org" <wei.liu@kernel.org>,
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"sstabellini@kernel.org" <sstabellini@kernel.org>,
"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
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"robin.murphy@arm.com" <robin.murphy@arm.com>,
Tianyu Lan <Tianyu.Lan@microsoft.com>,
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Cc: "iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
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vkuznets <vkuznets@redhat.com>,
"brijesh.singh@amd.com" <brijesh.singh@amd.com>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"hch@lst.de" <hch@lst.de>,
"parri.andrea@gmail.com" <parri.andrea@gmail.com>,
"dave.hansen@intel.com" <dave.hansen@intel.com>
Subject: Re: [PATCH V3 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM
Date: Sat, 4 Dec 2021 15:26:36 +0800 [thread overview]
Message-ID: <877e6f24-2004-0681-f9f3-241fb6ace427@gmail.com> (raw)
In-Reply-To: <MWHPR21MB159390BE1B546A6F90FB1F18D76A9@MWHPR21MB1593.namprd21.prod.outlook.com>
On 12/4/2021 3:17 AM, Michael Kelley (LINUX) wrote:
>> +static void __init hyperv_iommu_swiotlb_init(void)
>> +{
>> + unsigned long hyperv_io_tlb_size;
>> + void *hyperv_io_tlb_start;
>> +
>> + /*
>> + * Allocate Hyper-V swiotlb bounce buffer at early place
>> + * to reserve large contiguous memory.
>> + */
>> + hyperv_io_tlb_size = swiotlb_size_or_default();
>> + hyperv_io_tlb_start = memblock_alloc(hyperv_io_tlb_size, PAGE_SIZE);
>> +
>> + if (!hyperv_io_tlb_start)
>> + pr_warn("Fail to allocate Hyper-V swiotlb buffer.\n");
> In the error case, won't swiotlb_init_with_tlb() end up panic'ing when
> it tries to zero out the memory? The only real choice here is to
> return immediately after printing the message, and not call
> swiotlb_init_with_tlb().
>
Yes, agree. Will update.
next prev parent reply other threads:[~2021-12-04 7:28 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-01 16:02 [PATCH V3 0/5] x86/Hyper-V: Add Hyper-V Isolation VM support(Second part) Tianyu Lan
2021-12-01 16:02 ` [PATCH V3 1/5] Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-12-02 14:42 ` Tom Lendacky
2021-12-03 11:20 ` Tianyu Lan
2021-12-03 19:11 ` Tom Lendacky
2021-12-03 20:06 ` Tom Lendacky
2021-12-04 7:21 ` Tianyu Lan
2021-12-01 16:02 ` [PATCH V3 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has() Tianyu Lan
2021-12-02 14:39 ` Wei Liu
2021-12-03 11:23 ` Tianyu Lan
2021-12-01 16:02 ` [PATCH V3 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-12-02 14:43 ` Wei Liu
2021-12-03 11:25 ` Tianyu Lan
2021-12-03 19:17 ` Michael Kelley (LINUX)
2021-12-04 7:26 ` Tianyu Lan [this message]
2021-12-01 16:02 ` [PATCH V3 4/5] scsi: storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-12-01 16:02 ` [PATCH V3 5/5] hv_netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-12-03 18:59 ` Michael Kelley (LINUX)
2021-12-04 7:42 ` Tianyu Lan
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