Commit d8147384 authored Jun 07, 2024 by Paolo Bonzini

KVM: interrupt kvm_gmem_populate() on signals

kvm_gmem_populate() is a potentially lengthy operation that can involve
multiple calls to the firmware.  Interrupt it if a signal arrives.

Fixes: 1f6c06b1 ("KVM: guest_memfd: Add interface for populating gmem pages with user data")
Cc: Isaku Yamahata <isaku.yamahata@intel.com>
Cc: Michael Roth <michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent f99b0522

virt/kvm/guest_memfd.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -629,6 +629,11 @@ long kvm_gmem_populate(struct kvm kvm, gfn_t start_gfn, void __user src, long
		gfn_t gfn = start_gfn + i;
		kvm_pfn_t pfn;

		if (signal_pending(current)) {
		ret = -EINTR;
		break;
		}

		ret = __kvm_gmem_get_pfn(file, slot, gfn, &pfn, &max_order, false);
		if (ret)
		break;