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hw/display/xlnx_dp: Don't abort for unsupported graphics formats

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If the guest writes an invalid or unsupported value to the
AV_BUF_FORMAT register, currently we abort().  Instead, log this as
either a guest error or an unimplemented error and continue.

The existing code treats DP_NL_VID_CB_Y0_CR_Y1 as x8b8g8r8
via a "case 0" that does not use the enum constant name for some
reason; we leave that alone beyond adding a comment about the
weird code.

Documentation of this register seems to be at:
https://docs.amd.com/r/en-US/ug1087-zynq-ultrascale-registers/AV_BUF_FORMAT-DISPLAY_PORT-Register

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1415
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20251106145209.1083998-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2025-11-06 14:52:09 +00:00
parent f52db7f342
commit 032333eba7
1 changed files with 49 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

55
hw/display/xlnx_dp.c
View file

@ -665,14 +665,28 @@ static void xlnx_dp_change_graphic_fmt(XlnxDPState *s)
case DP_GRAPHIC_BGR888:
s->g_plane.format = PIXMAN_b8g8r8;
break;
case DP_GRAPHIC_RGBA5551:
case DP_GRAPHIC_RGBA4444:
case DP_GRAPHIC_8BPP:
case DP_GRAPHIC_4BPP:
case DP_GRAPHIC_2BPP:
case DP_GRAPHIC_1BPP:
qemu_log_mask(LOG_UNIMP, "%s: unimplemented graphic format %u",
__func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_GRAPHIC_MASK);
s->g_plane.format = PIXMAN_r8g8b8a8;
break;
default:
error_report("%s: unsupported graphic format %u", __func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_GRAPHIC_MASK);
abort();
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid graphic format %u",
__func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_GRAPHIC_MASK);
s->g_plane.format = PIXMAN_r8g8b8a8;
break;
}
switch (s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK) {
case 0:
/* This is DP_NL_VID_CB_Y0_CR_Y1 ??? */
s->v_plane.format = PIXMAN_x8b8g8r8;
break;
case DP_NL_VID_Y0_CB_Y1_CR:
@ -681,10 +695,39 @@ static void xlnx_dp_change_graphic_fmt(XlnxDPState *s)
case DP_NL_VID_RGBA8880:
s->v_plane.format = PIXMAN_x8b8g8r8;
break;
case DP_NL_VID_CR_Y0_CB_Y1:
case DP_NL_VID_Y0_CR_Y1_CB:
case DP_NL_VID_YV16:
case DP_NL_VID_YV24:
case DP_NL_VID_YV16CL:
case DP_NL_VID_MONO:
case DP_NL_VID_YV16CL2:
case DP_NL_VID_YUV444:
case DP_NL_VID_RGB888:
case DP_NL_VID_RGB888_10BPC:
case DP_NL_VID_YUV444_10BPC:
case DP_NL_VID_YV16CL2_10BPC:
case DP_NL_VID_YV16CL_10BPC:
case DP_NL_VID_YV16_10BPC:
case DP_NL_VID_YV24_10BPC:
case DP_NL_VID_Y_ONLY_10BPC:
case DP_NL_VID_YV16_420:
case DP_NL_VID_YV16CL_420:
case DP_NL_VID_YV16CL2_420:
case DP_NL_VID_YV16_420_10BPC:
case DP_NL_VID_YV16CL_420_10BPC:
case DP_NL_VID_YV16CL2_420_10BPC:
qemu_log_mask(LOG_UNIMP, "%s: unimplemented video format %u",
__func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK);
s->v_plane.format = PIXMAN_x8b8g8r8;
break;
default:
error_report("%s: unsupported video format %u", __func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK);
abort();
qemu_log_mask(LOG_UNIMP, "%s: invalid video format %u",
__func__,
s->avbufm_registers[AV_BUF_FORMAT] & DP_NL_VID_FMT_MASK);
s->v_plane.format = PIXMAN_x8b8g8r8;
break;
}
xlnx_dp_recreate_surface(s);