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[Qemu-devel] [PATCH v2 1/4] intel_iommu: fix operator in vtd_switch_addr
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v2 1/4] intel_iommu: fix operator in vtd_switch_address_space |
Date: |
Wed, 16 Jan 2019 11:08:12 +0800 |
When calculating use_iommu, we wanted to first detect whether DMAR is
enabled, then check whether PT is enabled if DMAR is enabled. However
in the current code we used "&" rather than "&&" so the ordering
requirement is lost (instead it'll be an "AND" operation). This could
introduce errors dumped in QEMU console when rebooting a guest with
both assigned device and vIOMMU, like:
qemu-system-x86_64: vtd_dev_to_context_entry: invalid root entry:
rsvd=0xf000ff53f000e2c3, val=0xf000ff53f000ff53 (reserved nonzero)
Acked-by: Jason Wang <address@hidden>
Signed-off-by: Peter Xu <address@hidden>
---
hw/i386/intel_iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 8b72735650..6d5cc1d039 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1153,7 +1153,7 @@ static bool vtd_switch_address_space(VTDAddressSpace *as)
assert(as);
- use_iommu = as->iommu_state->dmar_enabled & !vtd_dev_pt_enabled(as);
+ use_iommu = as->iommu_state->dmar_enabled && !vtd_dev_pt_enabled(as);
trace_vtd_switch_address_space(pci_bus_num(as->bus),
VTD_PCI_SLOT(as->devfn),
--
2.17.1