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From f2fb460ba2b9c5547f8bcf4d7542a5e17bbe09bd Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Mon, 9 Oct 2017 06:51:32 +0200
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Subject: [PATCH 05/69] intel_iommu: fix missing BQL in pt fast path
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RH-Author: Peter Xu <peterx@redhat.com>
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Message-id: <20171009065132.5597-2-peterx@redhat.com>
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Patchwork-id: 76929
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O-Subject: [RHEV-7.5 qemu-kvm-rhev PATCH 1/1] intel_iommu: fix missing BQL in pt fast path
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Bugzilla: 1449067
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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In vtd_switch_address_space() we did the memory region switch, however
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it's possible that the caller of it has not taken the BQL at all. Make
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sure we have it.
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CC: Paolo Bonzini <pbonzini@redhat.com>
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CC: Jason Wang <jasowang@redhat.com>
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CC: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 66a4a0318e6b9539505491e4576fb93a708095d8)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/i386/intel_iommu.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
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index a7bf87a..3a5bb0b 100644
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--- a/hw/i386/intel_iommu.c
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+++ b/hw/i386/intel_iommu.c
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@@ -957,6 +957,8 @@ static bool vtd_dev_pt_enabled(VTDAddressSpace *as)
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static bool vtd_switch_address_space(VTDAddressSpace *as)
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{
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bool use_iommu;
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+ /* Whether we need to take the BQL on our own */
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+ bool take_bql = !qemu_mutex_iothread_locked();
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assert(as);
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@@ -967,6 +969,15 @@ static bool vtd_switch_address_space(VTDAddressSpace *as)
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VTD_PCI_FUNC(as->devfn),
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use_iommu);
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+ /*
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+ * It's possible that we reach here without BQL, e.g., when called
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+ * from vtd_pt_enable_fast_path(). However the memory APIs need
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+ * it. We'd better make sure we have had it already, or, take it.
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+ */
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+ if (take_bql) {
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+ qemu_mutex_lock_iothread();
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+ }
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+
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/* Turn off first then on the other */
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if (use_iommu) {
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memory_region_set_enabled(&as->sys_alias, false);
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@@ -976,6 +987,10 @@ static bool vtd_switch_address_space(VTDAddressSpace *as)
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memory_region_set_enabled(&as->sys_alias, true);
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}
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+ if (take_bql) {
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+ qemu_mutex_unlock_iothread();
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+ }
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+
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return use_iommu;
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}
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--
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1.8.3.1
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