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KVM: SVM: Remove wbinvd in sev_vm_destroy()

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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: Sean Christopherson <seanjc@google.com>
Signed-off-by: Zheyun Shen <szy0127@sjtu.edu.cn>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20250522233733.3176144-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Zheyun Shen 2025-05-22 16:37:30 -07:00 committed by Sean Christopherson
parent 55aed8c2db
commit 7e00013bd3
1 changed files with 0 additions and 6 deletions
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6
arch/x86/kvm/svm/sev.c
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@ -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