mirror of https://github.com/xqemu/xqemu.git
15126cba86
Sets valid.max_access_size and valid.min_access_size to ensure safe 8-byte accesses to vfio. Today, 8-byte accesses are broken into pairs of 4-byte calls that goes unprotected: qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc0, 0x2020c, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc4, 0xa0000, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 which occasionally leads to: qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc0, 0x2030c, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc0, 0x1000c, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc4, 0xb0000, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc4, 0xa0000, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 causing strange errors in guest OS. With this patch, such accesses are protected by the same lock guard: qemu_mutex_lock locked mutex 0x10905ad8 vfio_region_write (0001:03:00.0:region1+0xc0, 0x2000c, 4) vfio_region_write (0001:03:00.0:region1+0xc4, 0xb0000, 4) qemu_mutex_unlock unlocked mutex 0x10905ad8 This happens because the 8-byte write should be broken into 4-byte writes by memory.c:access_with_adjusted_size() in order to be under the same lock. Today, it's done in exec.c:address_space_write_continue() which was able to handle only 4 bytes due to a zero'ed valid.max_access_size (see exec.c:memory_access_size()). Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> |
||
|---|---|---|
| .. | ||
| 9pfs | ||
| acpi | ||
| adc | ||
| alpha | ||
| arm | ||
| audio | ||
| block | ||
| bt | ||
| char | ||
| core | ||
| cpu | ||
| cris | ||
| display | ||
| dma | ||
| gpio | ||
| i2c | ||
| i386 | ||
| ide | ||
| input | ||
| intc | ||
| ipack | ||
| ipmi | ||
| isa | ||
| lm32 | ||
| m68k | ||
| mem | ||
| microblaze | ||
| mips | ||
| misc | ||
| moxie | ||
| net | ||
| nios2 | ||
| nvram | ||
| openrisc | ||
| pci | ||
| pci-bridge | ||
| pci-host | ||
| pcmcia | ||
| ppc | ||
| s390x | ||
| scsi | ||
| sd | ||
| sh4 | ||
| smbios | ||
| sparc | ||
| sparc64 | ||
| ssi | ||
| timer | ||
| tpm | ||
| tricore | ||
| unicore32 | ||
| usb | ||
| vfio | ||
| virtio | ||
| watchdog | ||
| xen | ||
| xenpv | ||
| xtensa | ||
| Makefile.objs | ||