Re: [PATCH v4 1/9] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg

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On Wed, 2022-12-14 at 10:23 +0800, kernel test robot wrote:
> Hi Janis,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on 739ad2e4e15b585a0eaf98b7bdee62b2dd9588c9]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Janis-Schoetterl-Glausch/KVM-s390-Extend-MEM_OP-ioctl-by-storage-key-checked-cmpxchg/20221214-005540
> base:   739ad2e4e15b585a0eaf98b7bdee62b2dd9588c9
> patch link:    https://lore.kernel.org/r/20221213165405.2953539-2-scgl%40linux.ibm.com
> patch subject: [PATCH v4 1/9] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg
> config: s390-randconfig-r004-20221213
> compiler: s390-linux-gcc (GCC) 12.1.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/4e0991bd47ba30c7588e042da7a84d84b9f84056
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Janis-Schoetterl-Glausch/KVM-s390-Extend-MEM_OP-ioctl-by-storage-key-checked-cmpxchg/20221214-005540
>         git checkout 4e0991bd47ba30c7588e042da7a84d84b9f84056
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> 
> All errors (new ones prefixed by >>):
> 
>    s390-linux-ld: arch/s390/kvm/gaccess.o: in function `__cmpxchg_user_key':
> > > arch/s390/include/asm/uaccess.h:410: undefined reference to `__ashlti3'
> > > s390-linux-ld: arch/s390/include/asm/uaccess.h:411: undefined reference to `__ashlti3'
>    s390-linux-ld: arch/s390/include/asm/uaccess.h:458: undefined reference to `__ashlti3'
>    s390-linux-ld: arch/s390/include/asm/uaccess.h:459: undefined reference to `__ashlti3'
> 
> 
> vim +410 arch/s390/include/asm/uaccess.h
> 
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  396  
> 4148575abe1e14 Heiko Carstens           2022-11-02  397  static __always_inline int __cmpxchg_user_key(unsigned long address, void *uval,
> 4148575abe1e14 Heiko Carstens           2022-11-02  398  					      __uint128_t old, __uint128_t new,
> 4148575abe1e14 Heiko Carstens           2022-11-02  399  					      unsigned long key, int size)
> 4148575abe1e14 Heiko Carstens           2022-11-02  400  {
> 4148575abe1e14 Heiko Carstens           2022-11-02  401  	int rc = 0;
> 4148575abe1e14 Heiko Carstens           2022-11-02  402  
> 4148575abe1e14 Heiko Carstens           2022-11-02  403  	switch (size) {
> 4148575abe1e14 Heiko Carstens           2022-11-02  404  	case 1: {
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  405  		unsigned int prev, shift, mask, _old, _new;
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  406  		unsigned long count;
> 4148575abe1e14 Heiko Carstens           2022-11-02  407  
> 4148575abe1e14 Heiko Carstens           2022-11-02  408  		shift = (3 ^ (address & 3)) << 3;
> 4148575abe1e14 Heiko Carstens           2022-11-02  409  		address ^= address & 3;
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16 @410  		_old = (old & 0xff) << shift;
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16 @411  		_new = (new & 0xff) << shift;

Not sure what it is in this config that causes gcc to emit this symbol instead of a shift instruction, but casting old/new to 32 bit fixes
the error.

> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  412  		mask = ~(0xff << shift);
> 4148575abe1e14 Heiko Carstens           2022-11-02  413  		asm volatile(
> 4148575abe1e14 Heiko Carstens           2022-11-02  414  			"	spka	0(%[key])\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  415  			"	sacf	256\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  416  			"	llill	%[count],%[max_loops]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  417  			"0:	l	%[prev],%[address]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  418  			"1:	nr	%[prev],%[mask]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  419  			"	xilf	%[mask],0xffffffff\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  420  			"	or	%[new],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  421  			"	or	%[prev],%[tmp]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  422  			"2:	lr	%[tmp],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  423  			"3:	cs	%[prev],%[new],%[address]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  424  			"4:	jnl	5f\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  425  			"	xr	%[tmp],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  426  			"	xr	%[new],%[tmp]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  427  			"	nr	%[tmp],%[mask]\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  428  			"	jnz	5f\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  429  			"	brct	%[count],2b\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  430  			"5:	sacf	768\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  431  			"	spka	%[default_key]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  432  			EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  433  			EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  434  			EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  435  			EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
> 4148575abe1e14 Heiko Carstens           2022-11-02  436  			: [rc] "+&d" (rc),
> 4148575abe1e14 Heiko Carstens           2022-11-02  437  			  [prev] "=&d" (prev),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  438  			  [address] "+Q" (*(int *)address),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  439  			  [tmp] "+&d" (_old),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  440  			  [new] "+&d" (_new),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  441  			  [mask] "+&d" (mask),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  442  			  [count] "=a" (count)
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  443  			: [key] "%[count]" (key << 4),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  444  			  [default_key] "J" (PAGE_DEFAULT_KEY),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  445  			  [max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
> 4148575abe1e14 Heiko Carstens           2022-11-02  446  			: "memory", "cc");
> 4148575abe1e14 Heiko Carstens           2022-11-02  447  		*(unsigned char *)uval = prev >> shift;
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  448  		if (!count)
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  449  			rc = -EAGAIN;
> 4148575abe1e14 Heiko Carstens           2022-11-02  450  		return rc;
> 4148575abe1e14 Heiko Carstens           2022-11-02  451  	}
> 4148575abe1e14 Heiko Carstens           2022-11-02  452  	case 2: {
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  453  		unsigned int prev, shift, mask, _old, _new;
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  454  		unsigned long count;
> 4148575abe1e14 Heiko Carstens           2022-11-02  455  
> 4148575abe1e14 Heiko Carstens           2022-11-02  456  		shift = (2 ^ (address & 2)) << 3;
> 4148575abe1e14 Heiko Carstens           2022-11-02  457  		address ^= address & 2;
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  458  		_old = (old & 0xffff) << shift;
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  459  		_new = (new & 0xffff) << shift;

Same here.

> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  460  		mask = ~(0xffff << shift);
> 4148575abe1e14 Heiko Carstens           2022-11-02  461  		asm volatile(
> 4148575abe1e14 Heiko Carstens           2022-11-02  462  			"	spka	0(%[key])\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  463  			"	sacf	256\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  464  			"	llill	%[count],%[max_loops]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  465  			"0:	l	%[prev],%[address]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  466  			"1:	nr	%[prev],%[mask]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  467  			"	xilf	%[mask],0xffffffff\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  468  			"	or	%[new],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  469  			"	or	%[prev],%[tmp]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  470  			"2:	lr	%[tmp],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  471  			"3:	cs	%[prev],%[new],%[address]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  472  			"4:	jnl	5f\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  473  			"	xr	%[tmp],%[prev]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  474  			"	xr	%[new],%[tmp]\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  475  			"	nr	%[tmp],%[mask]\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  476  			"	jnz	5f\n"
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  477  			"	brct	%[count],2b\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  478  			"5:	sacf	768\n"
> 4148575abe1e14 Heiko Carstens           2022-11-02  479  			"	spka	%[default_key]\n"
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  480  			EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  481  			EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  482  			EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  483  			EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
> 4148575abe1e14 Heiko Carstens           2022-11-02  484  			: [rc] "+&d" (rc),
> 4148575abe1e14 Heiko Carstens           2022-11-02  485  			  [prev] "=&d" (prev),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  486  			  [address] "+Q" (*(int *)address),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  487  			  [tmp] "+&d" (_old),
> 51098f0eb22e2f Janis Schoetterl-Glausch 2022-11-16  488  			  [new] "+&d" (_new),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  489  			  [mask] "+&d" (mask),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  490  			  [count] "=a" (count)
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  491  			: [key] "%[count]" (key << 4),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  492  			  [default_key] "J" (PAGE_DEFAULT_KEY),
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  493  			  [max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
> 4148575abe1e14 Heiko Carstens           2022-11-02  494  			: "memory", "cc");
> 4148575abe1e14 Heiko Carstens           2022-11-02  495  		*(unsigned short *)uval = prev >> shift;
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  496  		if (!count)
> 739ad2e4e15b58 Janis Schoetterl-Glausch 2022-11-17  497  			rc = -EAGAIN;
> 4148575abe1e14 Heiko Carstens           2022-11-02  498  		return rc;

[...]




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