I'm not sure if this is directly related to PCI passthrough however dmesg on host returns, I don't really notice any major instability because of it but thought about asking as someone might have come across it before.
Code:
[171859.861517] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[171859.862224] pcieport 0000:00:03.1: [ 6] BadTLP
[171859.862902] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID
[174302.968163] {97}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[174302.968964] {97}[Hardware Error]: It has been corrected by h/w and requires no further action
[174302.969737] {97}[Hardware Error]: event severity: corrected
[174302.970508] {97}[Hardware Error]: Error 0, type: corrected
[174302.971276] {97}[Hardware Error]: section_type: PCIe error
[174302.972039] {97}[Hardware Error]: port_type: 4, root port
[174302.972779] {97}[Hardware Error]: version: 0.2
[174302.973529] {97}[Hardware Error]: command: 0x0407, status: 0x0010
[174302.974292] {97}[Hardware Error]: device_id: 0000:00:03.1
[174302.975051] {97}[Hardware Error]: slot: 0
[174302.975773] {97}[Hardware Error]: secondary_bus: 0x02
[174302.976471] {97}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[174302.977180] {97}[Hardware Error]: class_code: 060400
[174302.977901] {97}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[174302.988373] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[174302.989119] pcieport 0000:00:03.1: [ 6] BadTLP
[174302.989840] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID
[176319.068379] {98}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[176319.069140] {98}[Hardware Error]: It has been corrected by h/w and requires no further action
[176319.069866] {98}[Hardware Error]: event severity: corrected
[176319.070592] {98}[Hardware Error]: Error 0, type: corrected
[176319.071312] {98}[Hardware Error]: section_type: PCIe error
[176319.072028] {98}[Hardware Error]: port_type: 4, root port
[176319.072744] {98}[Hardware Error]: version: 0.2
[176319.073458] {98}[Hardware Error]: command: 0x0407, status: 0x0010
[176319.074177] {98}[Hardware Error]: device_id: 0000:00:03.1
[176319.074890] {98}[Hardware Error]: slot: 0
[176319.075592] {98}[Hardware Error]: secondary_bus: 0x02
[176319.076279] {98}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[176319.076968] {98}[Hardware Error]: class_code: 060400
[176319.077646] {98}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[176319.089390] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[176319.090091] pcieport 0000:00:03.1: [ 6] BadTLP
[176319.090774] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID
[178996.450972] {99}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[178996.451778] {99}[Hardware Error]: It has been corrected by h/w and requires no further action
[178996.452561] {99}[Hardware Error]: event severity: corrected
[178996.453341] {99}[Hardware Error]: Error 0, type: corrected
[178996.454075] {99}[Hardware Error]: section_type: PCIe error
[178996.454867] {99}[Hardware Error]: port_type: 4, root port
[178996.455637] {99}[Hardware Error]: version: 0.2
[178996.456404] {99}[Hardware Error]: command: 0x0407, status: 0x0010
[178996.457172] {99}[Hardware Error]: device_id: 0000:00:03.1
[178996.457909] {99}[Hardware Error]: slot: 0
[178996.458665] {99}[Hardware Error]: secondary_bus: 0x02
[178996.459408] {99}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[178996.460151] {99}[Hardware Error]: class_code: 060400
[178996.460881] {99}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[178996.470137] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[178996.470896] pcieport 0000:00:03.1: [ 6] BadTLP
[178996.471619] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID
[180202.017726] {100}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[180202.018495] {100}[Hardware Error]: It has been corrected by h/w and requires no further action
[180202.019221] {100}[Hardware Error]: event severity: corrected
[180202.019948] {100}[Hardware Error]: Error 0, type: corrected
[180202.020669] {100}[Hardware Error]: section_type: PCIe error
[180202.021386] {100}[Hardware Error]: port_type: 4, root port
[180202.022104] {100}[Hardware Error]: version: 0.2
[180202.022820] {100}[Hardware Error]: command: 0x0407, status: 0x0010
[180202.023540] {100}[Hardware Error]: device_id: 0000:00:03.1
[180202.024255] {100}[Hardware Error]: slot: 0
[180202.024956] {100}[Hardware Error]: secondary_bus: 0x02
[180202.025645] {100}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[180202.026335] {100}[Hardware Error]: class_code: 060400
[180202.027014] {100}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[180202.036201] pcieport 0000:00:03.1: AER: aer_status: 0x00001000, aer_mask: 0x00000000
[180202.036906] pcieport 0000:00:03.1: [12] Timeout
[180202.037583] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Transmitter ID
[183197.614670] {101}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[183197.615441] {101}[Hardware Error]: It has been corrected by h/w and requires no further action
[183197.616177] {101}[Hardware Error]: event severity: corrected
[183197.616911] {101}[Hardware Error]: Error 0, type: corrected
[183197.617641] {101}[Hardware Error]: section_type: PCIe error
[183197.618396] {101}[Hardware Error]: port_type: 4, root port
[183197.619125] {101}[Hardware Error]: version: 0.2
[183197.619849] {101}[Hardware Error]: command: 0x0407, status: 0x0010
[183197.620576] {101}[Hardware Error]: device_id: 0000:00:03.1
[183197.621301] {101}[Hardware Error]: slot: 0
[183197.622040] {101}[Hardware Error]: secondary_bus: 0x02
[183197.622789] {101}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[183197.623497] {101}[Hardware Error]: class_code: 060400
[183197.624187] {101}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[183197.634363] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[183197.635094] pcieport 0000:00:03.1: [ 6] BadTLP
[183197.635784] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID
[184553.715662] {102}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 512
[184553.716429] {102}[Hardware Error]: It has been corrected by h/w and requires no further action
[184553.717161] {102}[Hardware Error]: event severity: corrected
[184553.717926] {102}[Hardware Error]: Error 0, type: corrected
[184553.718652] {102}[Hardware Error]: section_type: PCIe error
[184553.719372] {102}[Hardware Error]: port_type: 4, root port
[184553.720092] {102}[Hardware Error]: version: 0.2
[184553.720809] {102}[Hardware Error]: command: 0x0407, status: 0x0010
[184553.721609] {102}[Hardware Error]: device_id: 0000:00:03.1
[184553.722326] {102}[Hardware Error]: slot: 0
[184553.723028] {102}[Hardware Error]: secondary_bus: 0x02
[184553.723717] {102}[Hardware Error]: vendor_id: 0x1022, device_id: 0x1483
[184553.724407] {102}[Hardware Error]: class_code: 060400
[184553.725087] {102}[Hardware Error]: bridge: secondary_status: 0x0000, control: 0x0012
[184553.736343] pcieport 0000:00:03.1: AER: aer_status: 0x00000040, aer_mask: 0x00000000
[184553.737055] pcieport 0000:00:03.1: [ 6] BadTLP
[184553.737784] pcieport 0000:00:03.1: AER: aer_layer=Data Link Layer, aer_agent=Receiver ID