linux-kernel - [RFC PATCH v1 3/5] KVM: arm64: Support usage of TTRem in guest stage-2 translation

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Date:   Tue, 26 Jan 2021 21:42:00 +0800
From:   Yanan Wang <wangyanan55@...wei.com>
To:     <kvmarm@...ts.cs.columbia.edu>,
        <linux-arm-kernel@...ts.infradead.org>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Marc Zyngier <maz@...nel.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
CC:     Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        <wanghaibin.wang@...wei.com>, <yezengruan@...wei.com>,
        <zhukeqian1@...wei.com>, <yuzenghui@...wei.com>,
        Yanan Wang <wangyanan55@...wei.com>
Subject: [RFC PATCH v1 3/5] KVM: arm64: Support usage of TTRem in guest stage-2 translation

As TTrem can be used when coalesce existing table mappings into a block
in guest stage-2 translation, so just support usage of it.

Signed-off-by: Yanan Wang <wangyanan55@...wei.com>
---
 arch/arm64/kvm/hyp/pgtable.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 4d177ce1d536..c8b959e3951b 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -437,6 +437,7 @@ struct stage2_map_data {
 
 	struct kvm_s2_mmu		*mmu;
 	struct kvm_mmu_memory_cache	*memcache;
+	u32				ttrem_level;
 };
 
 static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
@@ -633,6 +634,7 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
 		.phys		= ALIGN_DOWN(phys, PAGE_SIZE),
 		.mmu		= pgt->mmu,
 		.memcache	= mc,
+		.ttrem_level	= system_support_level_of_ttrem(),
 	};
 	struct kvm_pgtable_walker walker = {
 		.cb		= stage2_map_walker,
-- 
2.19.1