core: ivshmem: Keep MSI-X disabled and unmasked by default

Probably an early debugging left-over: The MSI-X control register should
have the feature disabled and unmasked by default (both related bits
cleared). MSI-X is supposed to be enabled by the guest OS, and so do
Linux and the inmate demo.

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

hypervisor/ivshmem.c

@@ -59,7 +59,7 @@ static const u32 default_cspace[IVSHMEM_CFG_SIZE / sizeof(u32)] = {
 	[0x2c/4] = (IVSHMEM_DEVICE_ID << 16) | VIRTIO_VENDOR_ID,
 	[0x34/4] = IVSHMEM_CFG_MSIX_CAP,
 	/* MSI-X capability */
-	[IVSHMEM_CFG_MSIX_CAP/4] = (0xC000 + IVSHMEM_MSIX_VECTORS - 1) << 16
+	[IVSHMEM_CFG_MSIX_CAP/4] = (IVSHMEM_MSIX_VECTORS - 1) << 16
 				   | (0x00 << 8) | PCI_CAP_MSIX,
 	[(IVSHMEM_CFG_MSIX_CAP + 0x4)/4] = PCI_CFG_BAR/8 + 2,
 	[(IVSHMEM_CFG_MSIX_CAP + 0x8)/4] = 0x10 * IVSHMEM_MSIX_VECTORS |