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dm: fix the issue when guest tries to disable memory range access

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According to PCI spec 3.0 section 6.2.2 "Device Control", guest
could write the command register to control device response to
io/mem access.

The origial code register/unregister the memory range which is
not suitable because it can't handle the sequence:
  1. disble the device response to specific memory range
  2. reboot guest (DM will try to free the memory range which
     was freed in step 1 already)

Tracked-On: #1277
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Yin Fengwei
2018-09-18 11:30:39 +08:00
committed by wenlingz
parent be0cde7dec
commit 8787b65fde
5 changed files with 182 additions and 4 deletions
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2
devicemodel/include/inout.h
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@@ -74,6 +74,8 @@ void init_inout(void);
int emulate_inout(struct vmctx *ctx, int *pvcpu, struct pio_request *req);
int register_inout(struct inout_port *iop);
int unregister_inout(struct inout_port *iop);
int enable_inout(struct inout_port *iop);
int disable_inout(struct inout_port *iop);
int init_bvmcons(void);
void deinit_bvmcons(void);
void enable_bvmcons(void);