Commit b4377753 authored by Peter Xu's avatar Peter Xu Committed by Paolo Bonzini
Browse files

intel-iommu: use atomic ops for irte index alloc

To allow concurrent allocation of irte index. Meanwhile, move the IRTE
setup debug line into the alloc since vtd_setup_msi() might not be the
only one to dump this info in the future.
Signed-off-by: default avatarPeter Xu <>
Signed-off-by: default avatarPaolo Bonzini <>
parent 9e8d01f9
......@@ -13,6 +13,7 @@
#include "intel-iommu.h"
#include "libcflat.h"
#include "pci.h"
#include "atomic.h"
* VT-d in QEMU currently only support 39 bits address width, which is
......@@ -239,9 +240,13 @@ void vtd_map_range(uint16_t sid, iova_t iova, phys_addr_t pa, size_t size)
static uint16_t vtd_intr_index_alloc(void)
static int index_ctr = 0;
static volatile int index_ctr = 0;
int ctr;
assert(index_ctr < 65535);
return index_ctr++;
ctr = atomic_inc_fetch(&index_ctr);
printf("INTR: alloc IRTE index %d\n", ctr);
return ctr;
static void vtd_setup_irte(struct pci_dev *dev, vtd_irte_t *irte,
......@@ -296,7 +301,6 @@ bool vtd_setup_msi(struct pci_dev *dev, int vector, int dest_id)
assert(sizeof(vtd_msi_addr_t) == 8);
assert(sizeof(vtd_msi_data_t) == 4);
printf("INTR: setup IRTE index %d\n", index);
vtd_setup_irte(dev, irte + index, vector, dest_id);
msi_addr.handle_15 = index >> 15 & 1;
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