[Xen-changelog] [xen master] add using domlist_read_lock in keyhandlers

[patchbot@xxxxxxx]

commit b3841d991dea4faf0799195313bc33f372af565c
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Feb 18 16:26:33 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 18 16:26:33 2020 +0100

    add using domlist_read_lock in keyhandlers
    
    Using for_each_domain() with out holding the domlist_read_lock is
    fragile, so add the lock in the keyhandlers it is missing.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/mm/p2m-ept.c       | 4 ++++
 xen/arch/x86/time.c             | 5 +++++
 xen/common/grant_table.c        | 7 +++++++
 xen/drivers/passthrough/iommu.c | 5 +++++
 4 files changed, 21 insertions(+)

diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index d4defa01c2..eb0f0edfef 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -1297,6 +1297,8 @@ static void ept_dump_p2m_table(unsigned char key)
     struct p2m_domain *p2m;
     struct ept_data *ept;
 
+    rcu_read_lock(&domlist_read_lock);
+
     for_each_domain(d)
     {
         if ( !hap_enabled(d) )
@@ -1347,6 +1349,8 @@ static void ept_dump_p2m_table(unsigned char key)
             unmap_domain_page(table);
         }
     }
+
+    rcu_read_unlock(&domlist_read_lock);
 }
 
 void setup_ept_dump(void)
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 1c86d49a0d..bb1b97787f 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -2406,6 +2406,9 @@ static void dump_softtsc(unsigned char key)
     } else
         printk("TSC not marked as either constant or reliable, "
                "warp=%lu (count=%lu)\n", tsc_max_warp, tsc_check_count);
+
+    rcu_read_lock(&domlist_read_lock);
+
     for_each_domain ( d )
     {
         if ( is_hardware_domain(d) && d->arch.tsc_mode == TSC_MODE_DEFAULT )
@@ -2422,6 +2425,8 @@ static void dump_softtsc(unsigned char key)
         domcnt++;
     }
 
+    rcu_read_unlock(&domlist_read_lock);
+
     if ( !domcnt )
             printk("No domains have emulated TSC\n");
 }
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index fe5a6b6917..bc37acae0e 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -4104,9 +4104,16 @@ static void gnttab_usage_print(struct domain *rd)
 static void gnttab_usage_print_all(unsigned char key)
 {
     struct domain *d;
+
     printk("%s [ key '%c' pressed\n", __func__, key);
+
+    rcu_read_lock(&domlist_read_lock);
+
     for_each_domain ( d )
         gnttab_usage_print(d);
+
+    rcu_read_unlock(&domlist_read_lock);
+
     printk("%s ] done\n", __func__);
 }
 
diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 9d421e06de..cab7a068aa 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -591,6 +591,9 @@ static void iommu_dump_p2m_table(unsigned char key)
     }
 
     ops = iommu_get_ops();
+
+    rcu_read_lock(&domlist_read_lock);
+
     for_each_domain(d)
     {
         if ( is_hardware_domain(d) || !is_iommu_enabled(d) )
@@ -605,6 +608,8 @@ static void iommu_dump_p2m_table(unsigned char key)
         printk("\ndomain%d IOMMU p2m table: \n", d->domain_id);
         ops->dump_p2m_table(d);
     }
+
+    rcu_read_unlock(&domlist_read_lock);
 }
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

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