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| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-03-12 18:16:52 +0000 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2015-03-12 22:34:49 +0100 |
| commit | aeda9130c38e2e0e77c1aaa65292c2f5a81107a8 (patch) | |
| tree | 1c217726f4716686217af22f9f1997c7cc9860a1 /arch/arm/kvm/trace.h | |
| parent | 35307b9a5f7ebcc8d8db41c73b69c131b48ace2b (diff) | |
| download | linux-aeda9130c38e2e0e77c1aaa65292c2f5a81107a8.tar.bz2 | |
arm/arm64: KVM: Optimize handling of Access Flag faults
Now that we have page aging in Stage-2, it becomes obvious that
we're doing way too much work handling the fault.
The page is not going anywhere (it is still mapped), the page
tables are already allocated, and all we want is to flip a bit
in the PMD or PTE. Also, we can avoid any form of TLB invalidation,
since a page with the AF bit off is not allowed to be cached.
An obvious solution is to have a separate handler for FSC_ACCESS,
where we pride ourselves to only do the very minimum amount of
work.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/trace.h')
| -rw-r--r-- | arch/arm/kvm/trace.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/kvm/trace.h b/arch/arm/kvm/trace.h index c09f37faff01..0ec35392d208 100644 --- a/arch/arm/kvm/trace.h +++ b/arch/arm/kvm/trace.h @@ -68,6 +68,21 @@ TRACE_EVENT(kvm_guest_fault, __entry->hxfar, __entry->vcpu_pc) ); +TRACE_EVENT(kvm_access_fault, + TP_PROTO(unsigned long ipa), + TP_ARGS(ipa), + + TP_STRUCT__entry( + __field( unsigned long, ipa ) + ), + + TP_fast_assign( + __entry->ipa = ipa; + ), + + TP_printk("IPA: %lx", __entry->ipa) +); + TRACE_EVENT(kvm_irq_line, TP_PROTO(unsigned int type, int vcpu_idx, int irq_num, int level), TP_ARGS(type, vcpu_idx, irq_num, level), |