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arm64: KVM: Add invalidate_icache_range helper

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We currently tightly couple dcache clean with icache invalidation,
but KVM could do without the initial flush to PoU, as we've
already flushed things to PoC.

Let's introduce invalidate_icache_range which is limited to
invalidating the icache from the linear mapping (and thus
has none of the userspace fault handling complexity), and
wire it in KVM instead of flush_icache_range.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier
2017-10-23 17:11:16 +01:00
committed by Christoffer Dall
parent a15f693935
commit 4fee947366
4 changed files with 52 additions and 12 deletions
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4
arch/arm64/include/asm/kvm_mmu.h
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@@ -250,8 +250,8 @@ static inline void __invalidate_icache_guest_page(struct kvm_vcpu *vcpu,
/* PIPT or VPIPT at EL2 (see comment in __kvm_tlb_flush_vmid_ipa) */
void *va = page_address(pfn_to_page(pfn));
flush_icache_range((unsigned long)va,
(unsigned long)va + size);
invalidate_icache_range((unsigned long)va,
(unsigned long)va + size);
}
}