x86: Reject PCI config space writes to unowned devices

Align the PIO path with MMIO accesses: We should report any write to a
non-existing or unowned device as failure than silently swallowing it.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

diff --git a/hypervisor/arch/x86/pci.c b/hypervisor/arch/x86/pci.c
index ef370f57c1f761d1ea4b38dedf84a35a4628263c..8426ad372dbba2022114c53181236be1adfc9fda 100644 (file)
--- a/hypervisor/arch/x86/pci.c
+++ b/hypervisor/arch/x86/pci.c
@@ -87,7 +87,7 @@ static int data_port_out_handler(struct registers *guest_regs, u16 port,
        u32 reg_data;
 
        if (!device)
-               return 1;
+               return -1;
 
        reg_data = get_rax_reg(guest_regs, size);