From: Yanan Wang <wangyanan55@huawei.com>
To: Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
"Quentin Perret" <qperret@google.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
<kvmarm@lists.cs.columbia.edu>,
<linux-arm-kernel@lists.infradead.org>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
"Suzuki K Poulose" <suzuki.poulose@arm.com>,
Gavin Shan <gshan@redhat.com>, <wanghaibin.wang@huawei.com>,
<zhukeqian1@huawei.com>, <yuzenghui@huawei.com>,
Yanan Wang <wangyanan55@huawei.com>
Subject: [PATCH v5 4/6] KVM: arm64: Provide invalidate_icache_range at non-VHE EL2
Date: Thu, 15 Apr 2021 19:50:30 +0800 [thread overview]
Message-ID: <20210415115032.35760-5-wangyanan55@huawei.com> (raw)
In-Reply-To: <20210415115032.35760-1-wangyanan55@huawei.com>
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@huawei.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
next prev parent reply other threads:[~2021-04-15 11:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 11:50 [PATCH v5 0/6] KVM: arm64: Improve efficiency of stage2 page table Yanan Wang
2021-04-15 11:50 ` [PATCH v5 1/6] KVM: arm64: Introduce KVM_PGTABLE_S2_GUEST stage-2 flag Yanan Wang
2021-06-02 10:43 ` Quentin Perret
2021-06-03 12:36 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 2/6] KVM: arm64: Move D-cache flush to the fault handlers Yanan Wang
[not found] ` <877djc1sca.wl-maz@kernel.org>
2021-06-02 10:49 ` Quentin Perret
2021-06-03 12:33 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 3/6] KVM: arm64: Add mm_ops member for structure stage2_attr_data Yanan Wang
2021-04-15 11:50 ` Yanan Wang [this message]
[not found] ` <875yyw1s73.wl-maz@kernel.org>
2021-06-03 12:34 ` [PATCH v5 4/6] KVM: arm64: Provide invalidate_icache_range at non-VHE EL2 wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 5/6] KVM: arm64: Move I-cache flush to the fault handlers Yanan Wang
2021-06-02 10:58 ` Quentin Perret
2021-06-03 12:35 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 6/6] KVM: arm64: Distinguish cases of memcache allocations completely Yanan Wang
2021-06-02 11:07 ` Quentin Perret
2021-06-03 12:52 ` wangyanan (Y)
2021-05-12 12:54 ` [PATCH v5 0/6] KVM: arm64: Improve efficiency of stage2 page table wangyanan (Y)
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