From: Corvin Köhne <[email protected]> When copying the calculation of the stolen memory size for Intels integrated graphics device of gen 9 and later from the Linux kernel [1], we missed subtracting 0xf0 from the graphics mode select value for values above 0xf0. This leads to QEMU reporting a very large size of the graphics stolen memory area. That's just a waste of memory. Additionally the guest firmware might be unable to allocate such a large buffer.
[1] https://github.com/torvalds/linux/blob/7c626ce4bae1ac14f60076d00eafe71af30450ba/arch/x86/kernel/early-quirks.c#L455-L460 Fixes: 8719224166832ff8230d7dd8599f42bd60e2eb96 Signed-off-by: Corvin Köhne <[email protected]> --- hw/vfio/igd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c index a95d441f68..732f9c37a6 100644 --- a/hw/vfio/igd.c +++ b/hw/vfio/igd.c @@ -498,7 +498,7 @@ static int igd_get_stolen_mb(int gen, uint32_t gmch) if (gms < 0xf0) return gms * 32; else - return gms * 4 + 4; + return (gms - 0xf0) * 4 + 4; } } -- 2.47.0
