linux-kernel - Re: [PATCH 4/4 v8] kdump/vmcore: support encrypted old memory with SME enabled

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Date:   Sun, 30 Sep 2018 10:43:59 +0800
From:   lijiang <lijiang@...hat.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, akpm@...ux-foundation.org,
        dan.j.williams@...el.com, thomas.lendacky@....com,
        bhelgaas@...gle.com, baiyaowei@...s.chinamobile.com, tiwai@...e.de,
        bp@...e.de, brijesh.singh@....com, dyoung@...hat.com,
        bhe@...hat.com, jroedel@...e.de
Subject: Re: [PATCH 4/4 v8] kdump/vmcore: support encrypted old memory with
 SME enabled

在 2018年09月30日 02:25, kbuild test robot 写道:
> Hi Lianbo,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on sof-driver-fuweitax/master]
> [also build test ERROR on v4.19-rc5 next-20180928]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Lianbo-Jiang/Support-kdump-for-AMD-secure-memory-encryption-SME/20180930-001539
> base:   https://github.com/fuweitax/linux master
> config: i386-randconfig-x0-09300051 (attached as .config)
> compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386 
> 
> All errors (new ones prefixed by >>):
> 
>    fs/proc/vmcore.o: In function `read_from_oldmem':
>>> fs/proc/vmcore.c:115: undefined reference to `copy_oldmem_page_encrypted'
> 
Ok, i will fix this compile error, and post again later.

Thanks.
> vim +115 fs/proc/vmcore.c
> 
>     88	
>     89	/* Reads a page from the oldmem device from given offset. */
>     90	static ssize_t read_from_oldmem(char *buf, size_t count,
>     91					u64 *ppos, int userbuf,
>     92					bool encrypted)
>     93	{
>     94		unsigned long pfn, offset;
>     95		size_t nr_bytes;
>     96		ssize_t read = 0, tmp;
>     97	
>     98		if (!count)
>     99			return 0;
>    100	
>    101		offset = (unsigned long)(*ppos % PAGE_SIZE);
>    102		pfn = (unsigned long)(*ppos / PAGE_SIZE);
>    103	
>    104		do {
>    105			if (count > (PAGE_SIZE - offset))
>    106				nr_bytes = PAGE_SIZE - offset;
>    107			else
>    108				nr_bytes = count;
>    109	
>    110			/* If pfn is not ram, return zeros for sparse dump files */
>    111			if (pfn_is_ram(pfn) == 0)
>    112				memset(buf, 0, nr_bytes);
>    113			else {
>    114				if (encrypted)
>  > 115					tmp = copy_oldmem_page_encrypted(pfn, buf,
>    116									 nr_bytes,
>    117									 offset,
>    118									 userbuf);
>    119				else
>    120					tmp = copy_oldmem_page(pfn, buf, nr_bytes,
>    121							       offset, userbuf);
>    122	
>    123				if (tmp < 0)
>    124					return tmp;
>    125			}
>    126			*ppos += nr_bytes;
>    127			count -= nr_bytes;
>    128			buf += nr_bytes;
>    129			read += nr_bytes;
>    130			++pfn;
>    131			offset = 0;
>    132		} while (count);
>    133	
>    134		return read;
>    135	}
>    136	
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>