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| author | Will Deacon <will.deacon@arm.com> | 2014-05-02 16:24:14 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-05-09 17:04:24 +0100 |
| commit | ee9e101c11478680d579bd20bb38a4d3e2514fe3 (patch) | |
| tree | cc2571bfc3d4691471e8c84f3fe6e83a1ec8e70d /arch/arm64 | |
| parent | d0488597a1b7105957b6d7d1bb0b6ee88aa51b37 (diff) | |
| download | linux-ee9e101c11478680d579bd20bb38a4d3e2514fe3.tar.gz linux-ee9e101c11478680d579bd20bb38a4d3e2514fe3.tar.bz2 linux-ee9e101c11478680d579bd20bb38a4d3e2514fe3.zip | |
arm64: kvm: use inner-shareable barriers for inner-shareable maintenance
In order to ensure completion of inner-shareable maintenance instructions
(cache and TLB) on AArch64, we can use the -ish suffix to the dsb
instruction.
This patch relaxes our dsb sy instructions to dsb ish where possible.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/hyp.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 2c56012cb2d2..b0d1512acf08 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -630,9 +630,15 @@ ENTRY(__kvm_tlb_flush_vmid_ipa) * whole of Stage-1. Weep... */ tlbi ipas2e1is, x1 - dsb sy + /* + * We have to ensure completion of the invalidation at Stage-2, + * since a table walk on another CPU could refill a TLB with a + * complete (S1 + S2) walk based on the old Stage-2 mapping if + * the Stage-1 invalidation happened first. + */ + dsb ish tlbi vmalle1is - dsb sy + dsb ish isb msr vttbr_el2, xzr @@ -643,7 +649,7 @@ ENTRY(__kvm_flush_vm_context) dsb ishst tlbi alle1is ic ialluis - dsb sy + dsb ish ret ENDPROC(__kvm_flush_vm_context) |