Commit 7e00013b authored by Zheyun Shen's avatar Zheyun Shen Committed by Sean Christopherson
Browse files

KVM: SVM: Remove wbinvd in sev_vm_destroy() 



Before sev_vm_destroy() is called, kvm_arch_guest_memory_reclaimed()
has been called for SEV and SEV-ES and kvm_arch_gmem_invalidate()
has been called for SEV-SNP. These functions have already handled
flushing the memory. Therefore, this wbinvd_on_all_cpus() can
simply be dropped.

Suggested-by: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarZheyun Shen <szy0127@sjtu.edu.cn>
Reviewed-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20250522233733.3176144-7-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 55aed8c2

arch/x86/kvm/svm/sev.c

+0 −6
Original line number Diff line number Diff line
@@ -2820,12 +2820,6 @@ void sev_vm_destroy(struct kvm *kvm) 
		return;

	}



	/*

	 * Ensure that all guest tagged cache entries are flushed before

	 * releasing the pages back to the system for use. CLFLUSH will

	 * not do this, so issue a WBINVD.

	 */

	wbinvd_on_all_cpus();



	/*

	 * if userspace was terminated before unregistering the memory regions