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From: Tianyu Lan <ltykernel@gmail.com>
To: Michael Kelley <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>,
	Dexuan Cui <decui@microsoft.com>,
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	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"brijesh.singh@amd.com" <brijesh.singh@amd.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>,
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	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	vkuznets <vkuznets@redhat.com>,
	"parri.andrea@gmail.com" <parri.andrea@gmail.com>,
	"dave.hansen@intel.com" <dave.hansen@intel.com>
Subject: Re: [PATCH V5 09/12] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM
Date: Thu, 16 Sep 2021 18:57:20 +0800	[thread overview]
Message-ID: <3f6a6407-b8fd-803b-e4fe-ea9a873a5840@gmail.com> (raw)
In-Reply-To: <MWHPR21MB159349234C15D0F04F87845CD7DB9@MWHPR21MB1593.namprd21.prod.outlook.com>

On 9/15/2021 11:42 PM, Michael Kelley wrote:
>> @@ -196,13 +199,34 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
>>   		mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
>>   		mem->slots[i].alloc_size = 0;
>>   	}
>> +
>> +	if (set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT))
>> +		return -EFAULT;
>> +
>> +	/*
>> +	 * Map memory in the unencrypted physical address space when requested
>> +	 * (e.g. for Hyper-V AMD SEV-SNP Isolation VMs).
>> +	 */
>> +	if (swiotlb_unencrypted_base) {
>> +		phys_addr_t paddr = __pa(vaddr) + swiotlb_unencrypted_base;
> Nit:  Use "start" instead of "__pa(vaddr)" since "start" is already the needed
> physical address.


Yes, "start" should be used here.

> 
>> @@ -304,7 +332,7 @@ int
>>   swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
>>   {
>>   	struct io_tlb_mem *mem = &io_tlb_default_mem;
>> -	unsigned long bytes = nslabs << IO_TLB_SHIFT;
>> +	int ret;
>>
>>   	if (swiotlb_force == SWIOTLB_NO_FORCE)
>>   		return 0;
>> @@ -318,8 +346,9 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
>>   	if (!mem->slots)
>>   		return -ENOMEM;
>>
>> -	set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
>> -	swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
>> +	ret = swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
>> +	if (ret)
> Before returning the error, free the pages obtained from the earlier call
> to __get_free_pages()?
> 

Yes, will fix.

Thanks.

  reply	other threads:[~2021-09-16 10:57 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14 13:39 [PATCH V5 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 01/12] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 02/12] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 03/12] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 04/12] Drivers: hv: vmbus: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-09-15 15:40   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 05/12] x86/hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-09-15 15:41   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 06/12] x86/hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 07/12] Drivers: hv: vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-09-15 15:41   ` Michael Kelley
2021-09-16 10:52     ` Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 08/12] Drivers: hv : vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 09/12] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-09-15 15:42   ` Michael Kelley
2021-09-16 10:57     ` Tianyu Lan [this message]
2021-09-14 13:39 ` [PATCH V5 10/12] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-09-15 15:43   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 11/12] scsi: storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-09-15 15:43   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 12/12] net: netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-09-14 15:49   ` Haiyang Zhang
2021-09-15 16:21   ` Michael Kelley
2021-09-15 16:46     ` Haiyang Zhang
2021-09-16 13:56       ` Tianyu Lan
2021-09-16 14:43     ` Tianyu Lan
2021-09-22 10:34     ` Tianyu Lan
2021-09-27 14:26       ` Tianyu Lan
2021-09-28  5:39         ` Christoph Hellwig
2021-09-28  9:23           ` Tianyu Lan
2021-09-30  5:48             ` Christoph Hellwig

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