提交 3cb73bc3 编写于 作者: K Kairui Song 提交者: Ingo Molnar

hyperv_fb: Update screen_info after removing old framebuffer

On gen2 HyperV VM, hyperv_fb will remove the old framebuffer, and the
new allocated framebuffer address could be at a differnt location,
and it might be no longer a VGA framebuffer.

Update screen_info so that after kexec the kernel won't try to reuse
the old invalid/stale framebuffer address as VGA, corrupting memory.

[ mingo: Tidied up the changelog. ]
Signed-off-by: NKairui Song <kasong@redhat.com>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Jake Oshins <jakeo@microsoft.com>
Cc: Wei Hu <weh@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Link: https://lore.kernel.org/r/20201014092429.1415040-3-kasong@redhat.com
上级 afc18069
......@@ -1114,8 +1114,15 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
getmem_done:
remove_conflicting_framebuffers(info->apertures,
KBUILD_MODNAME, false);
if (!gen2vm)
if (gen2vm) {
/* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
screen_info.lfb_size = 0;
screen_info.lfb_base = 0;
screen_info.orig_video_isVGA = 0;
} else {
pci_dev_put(pdev);
}
kfree(info->apertures);
return 0;
......
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