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ec941c5ffe
when memory hotplug enabled system is booted with less than 4GB of RAM and then later more RAM is hotplugged 32-bit devices stop functioning with following error: nommu_map_single: overflow 327b4f8c0+1522 of device mask ffffffff the reason for this is that if x86_64 system were booted with RAM less than 4GB, it doesn't enable SWIOTLB and when memory is hotplugged beyond MAX_DMA32_PFN, devices that expect 32-bit addresses can't handle 64-bit addresses. Fix it by tracking max possible PFN when parsing memory affinity structures from SRAT ACPI table and enable SWIOTLB if there is hotpluggable memory regions beyond MAX_DMA32_PFN. It fixes KVM guests when they use emulated devices (reproduces with ata_piix, e1000 and usb devices, RHBZ: 1275941, 1275977, 1271527) It also fixes the HyperV, VMWare with emulated devices which are affected by this issue as well. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akataria@vmware.com Cc: fujita.tomonori@lab.ntt.co.jp Cc: konrad.wilk@oracle.com Cc: pbonzini@redhat.com Cc: revers@redhat.com Cc: riel@redhat.com Link: http://lkml.kernel.org/r/1449234426-273049-3-git-send-email-imammedo@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| entry | ||
| ia32 | ||
| include | ||
| kernel | ||
| kvm | ||
| lguest | ||
| lib | ||
| math-emu | ||
| mm | ||
| net | ||
| oprofile | ||
| pci | ||
| platform | ||
| power | ||
| purgatory | ||
| ras | ||
| realmode | ||
| tools | ||
| um | ||
| video | ||
| xen | ||
| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||
| Makefile.um | ||