linux-kernel - [PATCH v6 1/4] KVM: arm64: Introduce cache maintenance callbacks for guest stage-2

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Message-ID: <20210616095200.38008-2-wangyanan55@huawei.com>
Date:   Wed, 16 Jun 2021 17:51:57 +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 v6 1/4] KVM: arm64: Introduce cache maintenance callbacks for guest stage-2

To prepare for performing guest CMOs in the fault handlers in pgtable.c,
introduce two cache maintenance callbacks in struct kvm_pgtable_mm_ops.

The new callbacks are specific for guest stage-2, so they will only be
initialized in 'struct kvm_pgtable_mm_ops kvm_s2_mm_ops'.

Signed-off-by: Yanan Wang <wangyanan55@...wei.com>
---
 arch/arm64/include/asm/kvm_pgtable.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index c3674c47d48c..302eca32e0af 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -44,6 +44,11 @@ typedef u64 kvm_pte_t;
  *			in the current context.
  * @virt_to_phys:	Convert a virtual address mapped in the current context
  *			into a physical address.
+ * @flush_dcache:	Clean data cache for a guest page address range before
+ *			creating the corresponding stage-2 mapping.
+ * @flush_icache:	Invalidate instruction cache for a guest page address
+ *			range before creating or updating the corresponding
+ *			stage-2 mapping.
  */
 struct kvm_pgtable_mm_ops {
 	void*		(*zalloc_page)(void *arg);
@@ -54,6 +59,8 @@ struct kvm_pgtable_mm_ops {
 	int		(*page_count)(void *addr);
 	void*		(*phys_to_virt)(phys_addr_t phys);
 	phys_addr_t	(*virt_to_phys)(void *addr);
+	void		(*flush_dcache)(void *addr, size_t size);
+	void		(*flush_icache)(void *addr, size_t size);
 };
 
 /**
-- 
2.23.0