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xen/pt: correctly handle PM status bit

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xen_pt_pmcsr_reg_write() needs an adjustment to deal with the RW1C
nature of the not passed through bit 15 (PCI_PM_CTRL_PME_STATUS).

This is a preparatory patch for XSA-131.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Jan Beulich 2015-06-02 15:07:01 +00:00 committed by Stefano Stabellini
parent d61bb2482d
commit c4ff1e68c6
1 changed files with 2 additions and 1 deletions
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3
hw/xen/xen_pt_config_init.c
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@ -948,7 +948,8 @@ static int xen_pt_pmcsr_reg_write(XenPCIPassthroughState *s,
/* create value for writing to I/O device register */ /* create value for writing to I/O device register */
throughable_mask = ~reg->emu_mask & valid_mask; throughable_mask = ~reg->emu_mask & valid_mask;
*val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); *val = XEN_PT_MERGE_VALUE(*val, dev_value & ~PCI_PM_CTRL_PME_STATUS,
throughable_mask);
return 0; return 0;
} }