[Qemu-devel] [PATCH 0/3] cputlb: Adjust tlb bswap implementation

[Richard Henderson <richard.henderson@linaro.org>]

The version that Tony came up with, and I reviewed, doesn't actually
work when applied to RAM.  It only worked for i/o memory.  This was
the root cause for

https://lists.gnu.org/archive/html/qemu-devel/2019-09/msg00036.html

I tried a couple of different approaches in load/store_helper, but
this is the one that didn't affect the normal case -- a simple tlb
miss against (non-swapped) ram.

This is able to boot the solaris 7 notdirty_mem_ops reproducer til
it panics due to no root file system, whereas before it would not
make it to the SunOS banner.

OpenBIOS for Sparc64
Configuration device id QEMU version 1 machine id 0
kernel cmdline 
CPUs: 1 x SUNW,UltraSPARC-IIi
UUID: 00000000-0000-0000-0000-000000000000
Welcome to OpenBIOS v1.1 built on Aug 25 2019 18:20
  Type 'help' for detailed information
Trying cdrom:f...
Not a bootable ELF image
Not a bootable a.out image

Loading FCode image...
Loaded 5936 bytes
entry point is 0x4000
Evaluating FCode...
open isn't unique.
SunOS Release 5.7 Version Generic_106541-06 [UNIX(R) System V Release 4.0]
Copyright (c) 1983-1999, Sun Microsystems, Inc.
WARNING: Interrupt not seen after set_features
Cannot assemble drivers for root /pci@1f,0/pci@1,1/ide@3/cdrom@2,0:b
Cannot mount root on /pci@1f,0/pci@1,1/ide@3/cdrom@2,0:b fstype ufs
panic[cpu0]/thread=10404040: vfs_mountroot: cannot mount root
skipping system dump - no dump device configured
rebooting...
BOOTpanic - kernel: prom_reboot: reboot call returned!
EXIT
0 > 


Richard Henderson (3):
  cputlb: Disable __always_inline__ without optimization
  cputlb: Replace switches in load/store_helper with callback
  cputlb: Introduce TLB_BSWAP

 include/exec/cpu-all.h |   2 +
 accel/tcg/cputlb.c     | 245 ++++++++++++++++++++++-------------------
 2 files changed, 131 insertions(+), 116 deletions(-)

-- 
2.17.1