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70ea13f6e6
linux/arch/powerpc
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Paul Mackerras 70ea13f6e6 KVM: PPC: Book3S HV: Flush TLB on secondary radix threads 
When running on POWER9 with kvm_hv.indep_threads_mode = N and the host
in SMT1 mode, KVM will run guest VCPUs on offline secondary threads.
If those guests are in radix mode, we fail to load the LPID and flush
the TLB if necessary, leading to the guest crashing with an
unsupported MMU fault.  This arises from commit 9a4506e11b ("KVM:
PPC: Book3S HV: Make radix handle process scoped LPID flush in C,
with relocation on", 2018-05-17), which didn't consider the case
where indep_threads_mode = N.

For simplicity, this makes the real-mode guest entry path flush the
TLB in the same place for both radix and hash guests, as we did before
9a4506e11b, though the code is now C code rather than assembly code.
We also have the radix TLB flush open-coded rather than calling
radix__local_flush_tlb_lpid_guest(), because the TLB flush can be
called in real mode, and in real mode we don't want to invoke the
tracepoint code.

Fixes: 9a4506e11b ("KVM: PPC: Book3S HV: Make radix handle process scoped LPID flush in C, with relocation on")
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2019-04-30 19:32:12 +10:00
..
boot Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
configs powerpc fixes for 5.1 #2 2019-03-16 10:45:17 -07:00
crypto powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
include KVM: PPC: Book3S HV: Flush TLB on secondary radix threads 2019-04-30 19:32:12 +10:00
kernel powerpc/security: Fix spectre_v2 reporting 2019-03-21 21:09:03 +11:00
kvm KVM: PPC: Book3S HV: Flush TLB on secondary radix threads 2019-04-30 19:32:12 +10:00
lib treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
math-emu powerpc: math-emu: remove unneeded header search paths 2019-01-14 20:39:27 +11:00
mm powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32 2019-03-19 00:30:19 +11:00
net powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
oprofile Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
perf powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
platforms device-dax for 5.1 2019-03-16 13:05:32 -07:00
purgatory powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
sysdev treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
tools powerpc/tools/checkpatch: Ignore DT_SPLIT_BINDING_PATCH 2018-12-04 19:45:01 +11:00
xmon powerpc/xmon: Fix opcode being uninitialized in print_insn_powerpc 2019-02-26 23:55:22 +11:00
Kbuild powerpc: Add -Werror at arch/powerpc level 2018-10-19 00:56:17 +11:00
Kconfig DMA mapping updates for 5.1 2019-03-10 11:54:48 -07:00
Kconfig.debug powerpc: Move page table dump files in a dedicated subdirectory 2019-02-22 22:29:22 +11:00
Makefile powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU 2019-02-23 22:31:40 +11:00
Makefile.postlink