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KVM: PPC: Book3S HV: XIVE: Clear file mapping when device is released

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Improve the release of the XIVE KVM device by clearing the file
address_space, which is used to unmap the interrupt ESB pages when a
device is passed-through.

Suggested-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Cédric Le Goater 2019-05-20 09:15:12 +02:00 committed by Paul Mackerras
parent 5a3f49364c
commit d47aacdb8e
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/kvm/book3s_xive_native.c
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@ -976,6 +976,14 @@ static void kvmppc_xive_native_release(struct kvm_device *dev)
pr_devel("Releasing xive native device\n");
/*
* Clear the KVM device file address_space which is used to
* unmap the ESB pages when a device is passed-through.
*/
mutex_lock(&xive->mapping_lock);
xive->mapping = NULL;
mutex_unlock(&xive->mapping_lock);
/*
* Since this is the device release function, we know that
* userspace does not have any open fd or mmap referring to