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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2016-01-29 15:01:28 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:15 +0000 |
| commit | 57c841f131ef295b583365d2fddd6b0d16e82c10 (patch) | |
| tree | e015fcf1eccbcc2d01f87762cddb29738e1a3bf8 /arch/arm/include/asm/kvm_emulate.h | |
| parent | ARM: KVM: Remove __kvm_hyp_exit/__kvm_hyp_exit_end (diff) | |
| download | linux-dev-57c841f131ef295b583365d2fddd6b0d16e82c10.tar.xz linux-dev-57c841f131ef295b583365d2fddd6b0d16e82c10.zip | |
arm/arm64: KVM: Handle out-of-RAM cache maintenance as a NOP
So far, our handling of cache maintenance by VA has been pretty
simple: Either the access is in the guest RAM and generates a S2
fault, which results in the page being mapped RW, or we go down
the io_mem_abort() path, and nuke the guest.
The first one is fine, but the second one is extremely weird.
Treating the CM as an I/O is wrong, and nothing in the ARM ARM
indicates that we should generate a fault for something that
cannot end-up in the cache anyway (even if the guest maps it,
it will keep on faulting at stage-2 for emulation).
So let's just skip this instruction, and let the guest get away
with it.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm/include/asm/kvm_emulate.h')
| -rw-r--r-- | arch/arm/include/asm/kvm_emulate.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h index 8a8c6ded9ca7..ee5328fc4b06 100644 --- a/arch/arm/include/asm/kvm_emulate.h +++ b/arch/arm/include/asm/kvm_emulate.h @@ -138,6 +138,11 @@ static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu) return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW; } +static inline bool kvm_vcpu_dabt_is_cm(struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & HSR_DABT_CM); +} + /* Get Access Size from a data abort */ static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu) { |