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author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2017-08-07 18:45:13 +0200 |
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committer | Michael S. Tsirkin <mst@redhat.com> | 2017-09-08 16:15:17 +0300 |
commit | c8389550dedc65892fba9c3df29423efd802f544 (patch) | |
tree | d12800e551f692de580758a48d4709239acaa994 | |
parent | 672339f7eff5e9226f302037290e84e783d2b5cd (diff) | |
download | qemu-c8389550dedc65892fba9c3df29423efd802f544.zip qemu-c8389550dedc65892fba9c3df29423efd802f544.tar.gz qemu-c8389550dedc65892fba9c3df29423efd802f544.tar.bz2 |
vmgenid: replace x-write-pointer-available hack
This compat property sole function is to prevent the device from being
instantiated. Instead of requiring an extra compat property, check if
fw_cfg has DMA enabled.
fw_cfg is a built-in device that is initialized very early by the
machine init code. We have at least one other device that also
assumes fw_cfg_find() can be safely used on realize: pvpanic.
This has the additional benefit of handling other cases properly, like:
$ qemu-system-x86_64 -device vmgenid -machine none
qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide
$ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.9 -global fw_cfg.dma_enabled=off
qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide
$ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.6 -global fw_cfg.dma_enabled=on
[boots normally]
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Ben Warren <ben@skyportsystems.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r-- | hw/acpi/bios-linker-loader.c | 10 | ||||
-rw-r--r-- | hw/acpi/vmgenid.c | 9 | ||||
-rw-r--r-- | include/hw/acpi/bios-linker-loader.h | 2 | ||||
-rw-r--r-- | include/hw/acpi/vmgenid.h | 1 | ||||
-rw-r--r-- | include/hw/compat.h | 4 |
5 files changed, 13 insertions, 13 deletions
diff --git a/hw/acpi/bios-linker-loader.c b/hw/acpi/bios-linker-loader.c index 046183a..d16b8bb 100644 --- a/hw/acpi/bios-linker-loader.c +++ b/hw/acpi/bios-linker-loader.c @@ -169,6 +169,16 @@ bios_linker_find_file(const BIOSLinker *linker, const char *name) } /* + * board code must realize fw_cfg first, as a fixed device, before + * another device realize function call bios_linker_loader_can_write_pointer() + */ +bool bios_linker_loader_can_write_pointer(void) +{ + FWCfgState *fw_cfg = fw_cfg_find(); + return fw_cfg && fw_cfg_dma_enabled(fw_cfg); +} + +/* * bios_linker_loader_alloc: ask guest to load file into guest memory. * * @linker: linker object instance diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c index 876723a..2876d8a 100644 --- a/hw/acpi/vmgenid.c +++ b/hw/acpi/vmgenid.c @@ -205,17 +205,11 @@ static void vmgenid_handle_reset(void *opaque) memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le)); } -static Property vmgenid_properties[] = { - DEFINE_PROP_BOOL("x-write-pointer-available", VmGenIdState, - write_pointer_available, true), - DEFINE_PROP_END_OF_LIST(), -}; - static void vmgenid_realize(DeviceState *dev, Error **errp) { VmGenIdState *vms = VMGENID(dev); - if (!vms->write_pointer_available) { + if (!bios_linker_loader_can_write_pointer()) { error_setg(errp, "%s requires DMA write support in fw_cfg, " "which this machine type does not provide", VMGENID_DEVICE); return; @@ -239,7 +233,6 @@ static void vmgenid_device_class_init(ObjectClass *klass, void *data) dc->vmsd = &vmstate_vmgenid; dc->realize = vmgenid_realize; dc->hotpluggable = false; - dc->props = vmgenid_properties; set_bit(DEVICE_CATEGORY_MISC, dc->categories); object_class_property_add_str(klass, VMGENID_GUID, NULL, diff --git a/include/hw/acpi/bios-linker-loader.h b/include/hw/acpi/bios-linker-loader.h index efe17b0..a711dbc 100644 --- a/include/hw/acpi/bios-linker-loader.h +++ b/include/hw/acpi/bios-linker-loader.h @@ -7,6 +7,8 @@ typedef struct BIOSLinker { GArray *file_list; } BIOSLinker; +bool bios_linker_loader_can_write_pointer(void); + BIOSLinker *bios_linker_loader_init(void); void bios_linker_loader_alloc(BIOSLinker *linker, diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h index 7beb959..38586ec 100644 --- a/include/hw/acpi/vmgenid.h +++ b/include/hw/acpi/vmgenid.h @@ -21,7 +21,6 @@ typedef struct VmGenIdState { DeviceClass parent_obj; QemuUUID guid; /* The 128-bit GUID seen by the guest */ uint8_t vmgenid_addr_le[8]; /* Address of the GUID (little-endian) */ - bool write_pointer_available; } VmGenIdState; /* returns NULL unless there is exactly one device */ diff --git a/include/hw/compat.h b/include/hw/compat.h index 3e101f8..9cc14dd 100644 --- a/include/hw/compat.h +++ b/include/hw/compat.h @@ -153,10 +153,6 @@ .driver = "fw_cfg_io",\ .property = "dma_enabled",\ .value = "off",\ - },{\ - .driver = "vmgenid",\ - .property = "x-write-pointer-available",\ - .value = "off",\ }, #define HW_COMPAT_2_3 \ |