Commit ca539ba4 authored by Anup Patel's avatar Anup Patel Committed by Anup Patel
Browse files

RISC-V: KVM: Implement kvm_arch_flush_remote_tlbs_range() 



The kvm_arch_flush_remote_tlbs_range() expected by KVM core can be
easily implemented for RISC-V using kvm_riscv_hfence_gvma_vmid_gpa()
hence provide it.

Also with kvm_arch_flush_remote_tlbs_range() available for RISC-V, the
mmu_wp_memory_region() can happily use kvm_flush_remote_tlbs_memslot()
instead of kvm_flush_remote_tlbs().

Signed-off-by: default avatarAnup Patel <apatel@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Tested-by: default avatarAtish Patra <atishp@rivosinc.com>
Reviewed-by: default avatarNutty Liu <liujingqi@lanxincomputing.com>
Link: https://lore.kernel.org/r/20250618113532.471448-7-apatel@ventanamicro.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent eaa98ba2

arch/riscv/include/asm/kvm_host.h

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ 
	KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)

#define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(6)



#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE



#define KVM_HEDELEG_DEFAULT		(BIT(EXC_INST_MISALIGNED) | \

					 BIT(EXC_BREAKPOINT)      | \

					 BIT(EXC_SYSCALL)         | \

arch/riscv/kvm/mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -344,7 +344,7 @@ static void gstage_wp_memory_region(struct kvm *kvm, int slot) 
	spin_lock(&kvm->mmu_lock);

	gstage_wp_range(kvm, start, end);

	spin_unlock(&kvm->mmu_lock);

	kvm_flush_remote_tlbs(kvm);

	kvm_flush_remote_tlbs_memslot(kvm, memslot);

}



int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,

arch/riscv/kvm/tlb.c

+8 −0
Original line number Diff line number Diff line
@@ -403,3 +403,11 @@ void kvm_riscv_hfence_vvma_all(struct kvm *kvm, 
	make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE_VVMA_ALL,

			    KVM_REQ_HFENCE_VVMA_ALL, NULL);

}



int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages)

{

	kvm_riscv_hfence_gvma_vmid_gpa(kvm, -1UL, 0,

				       gfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT,

				       PAGE_SHIFT);

	return 0;

}