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Message-ID: <20210415115032.35760-5-wangyanan55@huawei.com>
Date: Thu, 15 Apr 2021 19:50:30 +0800
From: Yanan Wang <wangyanan55@...wei.com>
To: Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
"Quentin Perret" <qperret@...gle.com>,
Alexandru Elisei <alexandru.elisei@....com>,
<kvmarm@...ts.cs.columbia.edu>,
<linux-arm-kernel@...ts.infradead.org>, <kvm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>,
Julien Thierry <julien.thierry.kdev@...il.com>,
"Suzuki K Poulose" <suzuki.poulose@....com>,
Gavin Shan <gshan@...hat.com>, <wanghaibin.wang@...wei.com>,
<zhukeqian1@...wei.com>, <yuzenghui@...wei.com>,
Yanan Wang <wangyanan55@...wei.com>
Subject: [PATCH v5 4/6] KVM: arm64: Provide invalidate_icache_range at non-VHE EL2
We want to move I-cache maintenance for the guest to the stage-2
page table code for performance improvement. Before it can work,
we should first make function invalidate_icache_range available
to non-VHE EL2 to avoid compiling or program running error, as
pgtable.c is now linked into the non-VHE EL2 code for pKVM mode.
In this patch, we only introduce symbol of invalidate_icache_range
with no real functionality in nvhe/cache.S, because there haven't
been situations found currently where I-cache maintenance is also
needed in non-VHE EL2 for pKVM mode.
Signed-off-by: Yanan Wang <wangyanan55@...wei.com>
---
arch/arm64/kvm/hyp/nvhe/cache.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/cache.S b/arch/arm64/kvm/hyp/nvhe/cache.S
index 36cef6915428..a125ec9aeed2 100644
--- a/arch/arm64/kvm/hyp/nvhe/cache.S
+++ b/arch/arm64/kvm/hyp/nvhe/cache.S
@@ -11,3 +11,14 @@ SYM_FUNC_START_PI(__flush_dcache_area)
dcache_by_line_op civac, sy, x0, x1, x2, x3
ret
SYM_FUNC_END_PI(__flush_dcache_area)
+
+/*
+ * invalidate_icache_range(start,end)
+ *
+ * Ensure that the I cache is invalid within specified region.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(invalidate_icache_range)
+SYM_FUNC_END(invalidate_icache_range)
--
2.23.0
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