From b8cc6eb5bded7078f796b2ebf548f79850281eb6 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 15 Dec 2021 16:12:30 +0000 Subject: KVM: arm64: Expose unshare hypercall to the host Introduce an unshare hypercall which can be used to unmap memory from the hypervisor stage-1 in nVHE protected mode. This will be useful to update the EL2 ownership state of pages during guest teardown, and avoids keeping dangling mappings to unreferenced portions of memory. Signed-off-by: Will Deacon Signed-off-by: Quentin Perret Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20211215161232.1480836-14-qperret@google.com --- arch/arm64/include/asm/kvm_asm.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arm64/include/asm/kvm_asm.h') diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 50d5e4de244c..d5b0386ef765 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -63,6 +63,7 @@ enum __kvm_host_smccc_func { /* Hypercalls available after pKVM finalisation */ __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp, + __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_hyp, __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc, __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run, __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context, -- cgit v1.2.3