[PATCH v2 1/4] RISC-V: KVM: Add the split page cache for ioctl context

[wang.yechao255 at zte.com.cn]

From: Wang Yechao <wang.yechao255 at zte.com.cn>

Add the split page cache for dirty logging enablement and the
KVM_CLEAR_DIRTY_LOG ioctl.

Signed-off-by: Wang Yechao <wang.yechao255 at zte.com.cn>
---
 arch/riscv/include/asm/kvm_host.h | 1 +
 arch/riscv/kvm/mmu.c              | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 75b0a951c1bc..0ee778f0f086 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -84,6 +84,7 @@ struct kvm_arch {
 	pgd_t *pgd;
 	phys_addr_t pgd_phys;
 	unsigned long pgd_levels;
+	struct kvm_mmu_memory_cache pgd_split_page_cache;

 	/* Guest Timer */
 	struct kvm_guest_timer timer;
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 2d3def024270..0676937bd9a1 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -549,6 +549,7 @@ int kvm_riscv_mmu_alloc_pgd(struct kvm *kvm)
 	kvm->arch.pgd = page_to_virt(pgd_page);
 	kvm->arch.pgd_phys = page_to_phys(pgd_page);
 	kvm->arch.pgd_levels = kvm_riscv_gstage_max_pgd_levels;
+	kvm->arch.pgd_split_page_cache.gfp_zero = __GFP_ZERO;

 	return 0;
 }
@@ -572,6 +573,8 @@ void kvm_riscv_mmu_free_pgd(struct kvm *kvm)

 	if (pgd)
 		free_pages((unsigned long)pgd, get_order(kvm_riscv_gstage_pgd_size));
+
+	kvm_mmu_free_memory_cache(&kvm->arch.pgd_split_page_cache);
 }

 void kvm_riscv_mmu_update_hgatp(struct kvm_vcpu *vcpu)
-- 
2.43.5