https://github.com/torvalds/linux
Revision 0d3e4d4fade6b04e933b11e69e80044f35e9cd60 authored by Marc Zyngier on 05 January 2015, 21:13:24 UTC, committed by Christoffer Dall on 29 January 2015, 22:24:57 UTC
When handling a fault in stage-2, we need to resync I$ and D$, just to be sure we don't leave any old cache line behind. That's very good, except that we do so using the *user* address. Under heavy load (swapping like crazy), we may end up in a situation where the page gets mapped in stage-2 while being unmapped from userspace by another CPU. At that point, the DC/IC instructions can generate a fault, which we handle with kvm->mmu_lock held. The box quickly deadlocks, user is unhappy. Instead, perform this invalidation through the kernel mapping, which is guaranteed to be present. The box is much happier, and so am I. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
1 parent 363ef89
Tip revision: 0d3e4d4fade6b04e933b11e69e80044f35e9cd60 authored by Marc Zyngier on 05 January 2015, 21:13:24 UTC
arm/arm64: KVM: Use kernel mapping to perform invalidation on page fault
arm/arm64: KVM: Use kernel mapping to perform invalidation on page fault
Tip revision: 0d3e4d4
| File | Mode | Size |
|---|---|---|
| basic | ||
| coccinelle | ||
| dtc | ||
| genksyms | ||
| kconfig | ||
| ksymoops | ||
| mod | ||
| package | ||
| rt-tester | ||
| selinux | ||
| tracing | ||
| .gitignore | -rw-r--r-- | 116 bytes |
| Kbuild.include | -rw-r--r-- | 10.9 KB |
| Lindent | -rwxr-xr-x | 460 bytes |
| Makefile | -rw-r--r-- | 1.4 KB |
| Makefile.asm-generic | -rw-r--r-- | 683 bytes |
| Makefile.build | -rw-r--r-- | 13.4 KB |
| Makefile.clean | -rw-r--r-- | 2.9 KB |
| Makefile.dtbinst | -rw-r--r-- | 1.4 KB |
| Makefile.extrawarn | -rw-r--r-- | 2.4 KB |
| Makefile.fwinst | -rw-r--r-- | 2.0 KB |
| Makefile.headersinst | -rw-r--r-- | 4.7 KB |
| Makefile.help | -rw-r--r-- | 68 bytes |
| Makefile.host | -rw-r--r-- | 4.5 KB |
| Makefile.lib | -rw-r--r-- | 13.7 KB |
| Makefile.modbuiltin | -rw-r--r-- | 1.8 KB |
| Makefile.modinst | -rw-r--r-- | 1.2 KB |
| Makefile.modpost | -rw-r--r-- | 5.2 KB |
| Makefile.modsign | -rw-r--r-- | 1005 bytes |
| analyze_suspend.py | -rwxr-xr-x | 117.6 KB |
| asn1_compiler.c | -rw-r--r-- | 33.8 KB |
| bloat-o-meter | -rwxr-xr-x | 1.9 KB |
| bootgraph.pl | -rwxr-xr-x | 6.3 KB |
| checkincludes.pl | -rwxr-xr-x | 1.8 KB |
| checkkconfigsymbols.py | -rw-r--r-- | 4.6 KB |
| checkpatch.pl | -rwxr-xr-x | 152.5 KB |
| checkstack.pl | -rwxr-xr-x | 5.4 KB |
| checksyscalls.sh | -rwxr-xr-x | 5.6 KB |
| checkversion.pl | -rwxr-xr-x | 1.9 KB |
| cleanfile | -rwxr-xr-x | 3.4 KB |
| cleanpatch | -rwxr-xr-x | 5.0 KB |
| coccicheck | -rwxr-xr-x | 4.6 KB |
| config | -rwxr-xr-x | 4.5 KB |
| conmakehash.c | -rw-r--r-- | 6.0 KB |
| decode_stacktrace.sh | -rwxr-xr-x | 3.0 KB |
| decodecode | -rwxr-xr-x | 2.1 KB |
| depmod.sh | -rwxr-xr-x | 1.7 KB |
| diffconfig | -rwxr-xr-x | 3.7 KB |
| docproc.c | -rw-r--r-- | 13.8 KB |
| export_report.pl | -rwxr-xr-x | 4.5 KB |
| extract-ikconfig | -rwxr-xr-x | 1.6 KB |
| extract-vmlinux | -rwxr-xr-x | 1.6 KB |
| gcc-goto.sh | -rwxr-xr-x | 495 bytes |
| gcc-ld | -rwxr-xr-x | 676 bytes |
| gcc-version.sh | -rwxr-xr-x | 822 bytes |
| gcc-x86_32-has-stack-protector.sh | -rwxr-xr-x | 184 bytes |
| gcc-x86_64-has-stack-protector.sh | -rwxr-xr-x | 200 bytes |
| gen_initramfs_list.sh | -rwxr-xr-x | 7.9 KB |
| get_maintainer.pl | -rwxr-xr-x | 57.3 KB |
| gfp-translate | -rwxr-xr-x | 1.7 KB |
| headerdep.pl | -rwxr-xr-x | 3.5 KB |
| headers.sh | -rwxr-xr-x | 477 bytes |
| headers_check.pl | -rwxr-xr-x | 3.6 KB |
| headers_install.sh | -rwxr-xr-x | 1.3 KB |
| kallsyms.c | -rw-r--r-- | 16.5 KB |
| kernel-doc | -rwxr-xr-x | 72.1 KB |
| ld-version.sh | -rwxr-xr-x | 205 bytes |
| link-vmlinux.sh | -rwxr-xr-x | 5.7 KB |
| makelst | -rwxr-xr-x | 773 bytes |
| markup_oops.pl | -rwxr-xr-x | 8.1 KB |
| mkcompile_h | -rwxr-xr-x | 2.5 KB |
| mkmakefile | -rwxr-xr-x | 1.2 KB |
| mksysmap | -rwxr-xr-x | 1.3 KB |
| mkuboot.sh | -rwxr-xr-x | 379 bytes |
| mkversion | -rw-r--r-- | 74 bytes |
| module-common.lds | -rw-r--r-- | 737 bytes |
| namespace.pl | -rwxr-xr-x | 13.0 KB |
| objdiff | -rwxr-xr-x | 2.7 KB |
| patch-kernel | -rwxr-xr-x | 9.9 KB |
| pnmtologo.c | -rw-r--r-- | 11.9 KB |
| profile2linkerlist.pl | -rwxr-xr-x | 375 bytes |
| recordmcount.c | -rw-r--r-- | 12.4 KB |
| recordmcount.h | -rw-r--r-- | 16.4 KB |
| recordmcount.pl | -rwxr-xr-x | 17.7 KB |
| setlocalversion | -rwxr-xr-x | 3.9 KB |
| show_delta | -rwxr-xr-x | 3.0 KB |
| sign-file | -rwxr-xr-x | 12.2 KB |
| sortextable.c | -rw-r--r-- | 7.6 KB |
| sortextable.h | -rw-r--r-- | 5.5 KB |
| spelling.txt | -rw-r--r-- | 20.8 KB |
| tags.sh | -rwxr-xr-x | 10.2 KB |
| unifdef.c | -rw-r--r-- | 34.8 KB |
| ver_linux | -rwxr-xr-x | 3.1 KB |
| xz_wrap.sh | -rwxr-xr-x | 562 bytes |
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