linux-kernel - [RFC PATCH 5/7] kvm: arm64: Add some HW

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Date:   Tue, 26 Jan 2021 20:44:42 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kvm@...r.kernel.org>,
        <kvmarm@...ts.cs.columbia.edu>, Marc Zyngier <maz@...nel.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Robin Murphy <robin.murphy@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        <wanghaibin.wang@...wei.com>, <jiangkunkun@...wei.com>,
        <xiexiangyou@...wei.com>, <zhengchuan@...wei.com>,
        <yubihong@...wei.com>
Subject: [RFC PATCH 5/7] kvm: arm64: Add some HW_DBM related mmu interfaces

This adds set_dbm, clear_dbm and sync_dirty interfaces in mmu layer.
They simply wrap those interfaces of pgtable layer, adding reschedule
semantics.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
---
 arch/arm64/include/asm/kvm_mmu.h |  7 +++++++
 arch/arm64/kvm/mmu.c             | 30 ++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index e52d82aeadca..51dd31ba1b94 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -183,6 +183,13 @@ int create_hyp_exec_mappings(phys_addr_t phys_addr, size_t size,
 			     void **haddr);
 void free_hyp_pgds(void);
 
+void kvm_stage2_clear_dbm(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages);
+void kvm_stage2_set_dbm(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages);
+void kvm_stage2_sync_dirty(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages);
+
 void stage2_unmap_vm(struct kvm *kvm);
 int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu);
 void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu);
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 7d2257cc5438..18717fd12731 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -609,6 +609,36 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 	kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
 }
 
+void kvm_stage2_clear_dbm(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages)
+{
+	phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+	phys_addr_t addr = base_gfn << PAGE_SHIFT;
+	phys_addr_t end = (base_gfn + npages) << PAGE_SHIFT;
+
+	stage2_apply_range_resched(kvm, addr, end, kvm_pgtable_stage2_clear_dbm);
+}
+
+void kvm_stage2_set_dbm(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages)
+{
+	phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+	phys_addr_t addr = base_gfn << PAGE_SHIFT;
+	phys_addr_t end = (base_gfn + npages) << PAGE_SHIFT;
+
+	stage2_apply_range_resched(kvm, addr, end, kvm_pgtable_stage2_set_dbm);
+}
+
+void kvm_stage2_sync_dirty(struct kvm *kvm, struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long npages)
+{
+	phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+	phys_addr_t addr = base_gfn << PAGE_SHIFT;
+	phys_addr_t end = (base_gfn + npages) << PAGE_SHIFT;
+
+	stage2_apply_range_resched(kvm, addr, end, kvm_pgtable_stage2_sync_dirty);
+}
+
 static void clean_dcache_guest_page(kvm_pfn_t pfn, unsigned long size)
 {
 	__clean_dcache_guest_page(pfn, size);
-- 
2.19.1