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KVM: interrupt kvm_gmem_populate() on signals

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

Fixes: 1f6c06b177 ("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>
This commit is contained in:
Paolo Bonzini 2024-06-07 18:10:29 +02:00
parent f99b052256
commit d81473840c
1 changed files with 5 additions and 0 deletions
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5
virt/kvm/guest_memfd.c
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@ -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; gfn_t gfn = start_gfn + i;
kvm_pfn_t pfn; kvm_pfn_t pfn;
if (signal_pending(current)) {
ret = -EINTR;
break;
}
ret = __kvm_gmem_get_pfn(file, slot, gfn, &pfn, &max_order, false); ret = __kvm_gmem_get_pfn(file, slot, gfn, &pfn, &max_order, false);
if (ret) if (ret)
break; break;