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From 5abddb02644d2a63d5dff21c936374d6ac3df31e Mon Sep 17 00:00:00 2001
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From: Adam Jackson <ajax@redhat.com>
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Date: Wed, 16 Feb 2011 17:19:00 -0500
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Subject: [PATCH] Turn shadowfb off on virtualized hardware
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There's no benefit to shadowfb, since the framebuffer is in the same
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memory domain as host memory; all you're doing is adding extra copies.
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Signed-off-by: Adam Jackson <ajax@redhat.com>
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---
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src/vesa.c | 34 +++++++++++++++++++++++++++++++---
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1 files changed, 31 insertions(+), 3 deletions(-)
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diff --git a/src/vesa.c b/src/vesa.c
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index 61d3550..9fd166f 100644
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--- a/src/vesa.c
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+++ b/src/vesa.c
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@@ -841,9 +841,37 @@ VESAPreInit(ScrnInfoPtr pScrn, int flags)
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memcpy(pVesa->Options, VESAOptions, sizeof(VESAOptions));
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xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, pVesa->Options);
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- /* Use shadow by default */
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- if (xf86ReturnOptValBool(pVesa->Options, OPTION_SHADOW_FB, TRUE))
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- pVesa->shadowFB = TRUE;
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+ /* Use shadow by default, for non-virt hardware */
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+ if (!xf86GetOptValBool(pVesa->Options, OPTION_SHADOW_FB, &pVesa->shadowFB))
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+ {
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+ switch (pVesa->pciInfo->vendor_id) {
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+ case 0x1234: /* bochs vga (not in pci.ids) */
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+ case 0x15ad: /* vmware */
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+ case 0x1b36: /* qemu qxl */
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+ case 0x80ee: /* virtualbox */
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+ case 0xaaaa: /* parallels (not in pci.ids) */
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+ pVesa->shadowFB = FALSE;
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+ break;
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+
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+ case 0x1013: /* qemu's cirrus emulation */
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+ if (pVesa->pciInfo->subvendor_id == 0x1af4)
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+ pVesa->shadowFB = FALSE;
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+ else
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+ pVesa->shadowFB = TRUE;
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+ break;
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+
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+ case 0x1414: /* microsoft hyper-v */
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+ if (pVesa->pciInfo->device_id == 0x5353)
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+ pVesa->shadowFB = FALSE;
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+ else
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+ pVesa->shadowFB = TRUE;
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+ break;
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+
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+ default:
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+ pVesa->shadowFB = TRUE;
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+ break;
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+ }
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+ }
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if (xf86ReturnOptValBool(pVesa->Options, OPTION_DFLT_REFRESH, FALSE))
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pVesa->defaultRefresh = TRUE;
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--
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1.7.3.5
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