Thanks Gerd,
might need another rebase. I have had some users request larger memory regions.
Quoting Gerd Hoffmann <kra...@redhat.com>:
> This patch adds a "use64" property which will make the ivshmem driver
> register a 64bit memory bar when set, so you have something to play with
> when testing 64bit pci bits. It also allows to have quite big shared
> memory regions, like this:
>
> [root@fedora ~]# lspci -vs1:1
> 01:01.0 RAM memory: Red Hat, Inc Device 1110
> Subsystem: Red Hat, Inc Device 1100
> Physical Slot: 1-1
> Flags: fast devsel
> Memory at fd400000 (32-bit, non-prefetchable) [disabled] [size=256]
> Memory at 8040000000 (64-bit, prefetchable) [size=1G]
>
> [ v3: rebase & adapt to latest master ]
> [ v2: default to on as suggested by avi,
> turn off for pc-$old using compat property ]
>
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Tested-by: Cam Macdonell <c...@cs.ualberta.ca>
> ---
> hw/ivshmem.c | 13 ++++++++++---
> hw/pc_piix.c | 4 ++++
> 2 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/hw/ivshmem.c b/hw/ivshmem.c
> index 05559b6..8a776e2 100644
> --- a/hw/ivshmem.c
> +++ b/hw/ivshmem.c
> @@ -72,6 +72,8 @@ typedef struct IVShmemState {
> MemoryRegion ivshmem;
> MemoryRegion msix_bar;
> uint64_t ivshmem_size; /* size of shared memory region */
> + uint32_t ivshmem_attr;
> + uint32_t ivshmem_64bit;
> int shm_fd; /* shared memory file descriptor */
>
> Peer *peers;
> @@ -344,7 +346,7 @@ static void create_shared_memory_BAR(IVShmemState *s, int
> fd) {
> memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
>
> /* region for shared memory */
> - pci_register_bar(&s->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
> + pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
> }
>
> static void close_guest_eventfds(IVShmemState *s, int posn)
> @@ -693,6 +695,11 @@ static int pci_ivshmem_init(PCIDevice *dev)
> &s->ivshmem_mmio);
>
> memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size);
> + s->ivshmem_attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
> + PCI_BASE_ADDRESS_MEM_PREFETCH;
> + if (s->ivshmem_64bit) {
> + s->ivshmem_attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
> + }
>
> if ((s->server_chr != NULL) &&
> (strncmp(s->server_chr->filename, "unix:", 5) == 0))
> {
> @@ -718,8 +725,7 @@ static int pci_ivshmem_init(PCIDevice *dev)
> /* allocate/initialize space for interrupt handling */
> s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
>
> - pci_register_bar(&s->dev, 2,
> - PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
> + pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
>
> s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
>
> @@ -791,6 +797,7 @@ static Property ivshmem_properties[] = {
> DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
> DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
> DEFINE_PROP_STRING("role", IVShmemState, role),
> + DEFINE_PROP_UINT32("use64", IVShmemState, ivshmem_64bit, 1),
> DEFINE_PROP_END_OF_LIST(),
> };
>
> diff --git a/hw/pc_piix.c b/hw/pc_piix.c
> index 0c0096f..5101f5d 100644
> --- a/hw/pc_piix.c
> +++ b/hw/pc_piix.c
> @@ -375,6 +375,10 @@ static QEMUMachine pc_machine_v1_2 = {
> .driver = "qxl",\
> .property = "vgamem_mb",\
> .value = stringify(8),\
> + },{\
> + .driver = "ivshmem",\
> + .property = "use64",\
> + .value = "0",\
> }
>
> static QEMUMachine pc_machine_v1_1 = {
> --
> 1.7.1
>
>
