linux-kernel - Re: [PATCH V5 09/12] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM

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Message-ID: <3f6a6407-b8fd-803b-e4fe-ea9a873a5840@gmail.com>
Date:   Thu, 16 Sep 2021 18:57:20 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
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        Dexuan Cui <decui@...rosoft.com>,
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Cc:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
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        vkuznets <vkuznets@...hat.com>,
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        "dave.hansen@...el.com" <dave.hansen@...el.com>
Subject: Re: [PATCH V5 09/12] x86/Swiotlb: Add Swiotlb bounce buffer remap
 function for HV IVM

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.