* [PATCH] x86/vMSI-X: fix qword write covering vector control field
@ 2016-04-01 9:14 Jan Beulich
0 siblings, 0 replies; only message in thread
From: Jan Beulich @ 2016-04-01 9:14 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Keir Fraser
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Along with using the upper 32 bits of the written value, the address
also needs advancing, so that msix_write_completion() will use the
correct address for re-invocation of msixtbl_write().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -295,6 +295,7 @@ static int msixtbl_write(struct vcpu *v,
if ( len != 8 || !index )
goto out;
val >>= 32;
+ address += 4;
}
/* Exit to device model when unmasking and address/data got modified. */
[-- Attachment #2: x86-vMSI-X-qword-mask-write.patch --]
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x86/vMSI-X: fix qword write covering vector control field
Along with using the upper 32 bits of the written value, the address
also needs advancing, so that msix_write_completion() will use the
correct address for re-invocation of msixtbl_write().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -295,6 +295,7 @@ static int msixtbl_write(struct vcpu *v,
if ( len != 8 || !index )
goto out;
val >>= 32;
+ address += 4;
}
/* Exit to device model when unmasking and address/data got modified. */
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