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Index: xen-4.9.0-testing/xen/arch/x86/hvm/stdvga.c
===================================================================
--- xen-4.9.0-testing.orig/xen/arch/x86/hvm/stdvga.c
+++ xen-4.9.0-testing/xen/arch/x86/hvm/stdvga.c
@@ -166,7 +166,10 @@ static int stdvga_outb(uint64_t addr, ui
/* When in standard vga mode, emulate here all writes to the vram buffer
* so we can immediately satisfy reads without waiting for qemu. */
- s->stdvga = (s->sr[7] == 0x00);
+ s->stdvga =
+ (s->sr[7] == 0x00) && /* standard vga mode */
+ (s->gr[6] == 0x05); /* misc graphics register w/ MemoryMapSelect=1
+ * 0xa0000-0xaffff (64k region), AlphaDis=1 */
if ( !prev_stdvga && s->stdvga )
{
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