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drm/i915/gvt: fix an issue in emulating cfg space PCI_COMMAND

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There's an issue in current cfg space emulation for PCI_COMMAND (offset
0x4): when guest changes some bits other than PCI_COMMAND_MEMORY, this
write operation will not be written to virutal cfg space successfully.

This patch is to fix the wrong behavior above.

Signed-off-by: Min He <min.he@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Min He 2016-12-21 14:54:48 +08:00 committed by Zhenyu Wang
parent 8ff842fd9e
commit 34700631bd
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gvt/cfg_space.c
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@ -123,6 +123,7 @@ static int emulate_pci_command_write(struct intel_vgpu *vgpu,
u8 changed = old ^ new;
int ret;
memcpy(vgpu_cfg_space(vgpu) + offset, p_data, bytes);
if (!(changed & PCI_COMMAND_MEMORY))
return 0;
@ -142,7 +143,6 @@ static int emulate_pci_command_write(struct intel_vgpu *vgpu,
return ret;
}
memcpy(vgpu_cfg_space(vgpu) + offset, p_data, bytes);
return 0;
}