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| author | Keir Fraser <keir.fraser@citrix.com> | 2010-08-09 16:33:45 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-08-09 16:33:45 +0100 |
| commit | 22bcc5f006e8d68a9ea30b6cf871097b5536b00f (patch) | |
| tree | b33cdda3d6af9b96eb287e69f0cd73de2eda21d5 | |
| parent | 1cb3c0f2288ef1043eb7d1a318a226a1ebc3be1b (diff) | |
| download | xen-22bcc5f006e8d68a9ea30b6cf871097b5536b00f.tar.gz xen-22bcc5f006e8d68a9ea30b6cf871097b5536b00f.tar.bz2 xen-22bcc5f006e8d68a9ea30b6cf871097b5536b00f.zip | |
vt-d: Fix ioapic_rte_to_remap_entry error path.
When ioapic_rte_to_remap_entry fails, currently it just writes value
to ioapic. But the 'mask' bit may be changed if it writes to the upper
half of RTE. This patch ensures to recover the original value of 'mask'
bit in this case.
Signed-off-by: Weidong Han <weidong.han@intel.com>
| -rw-r--r-- | xen/drivers/passthrough/vtd/intremap.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/xen/drivers/passthrough/vtd/intremap.c b/xen/drivers/passthrough/vtd/intremap.c index 1f9ca0e54c..78587b2c6e 100644 --- a/xen/drivers/passthrough/vtd/intremap.c +++ b/xen/drivers/passthrough/vtd/intremap.c @@ -440,6 +440,13 @@ void io_apic_write_remap_rte( { *IO_APIC_BASE(apic) = rte_upper ? (reg + 1) : reg; *(IO_APIC_BASE(apic)+4) = value; + + /* Recover the original value of 'mask' bit */ + if ( rte_upper ) + { + *IO_APIC_BASE(apic) = reg; + *(IO_APIC_BASE(apic)+4) = *(((u32 *)&old_rte)+0); + } return; } |