Re: [Xen-devel] [Qemu-devel] [PATCH v3 1/4] xen-all: Fix xen_hvm_init() to adjust pc memory layout.

[Andreas Färber <afaerber@xxxxxxx>]

Am 25.03.2014 00:55, schrieb Don Slutz:
> This is just below_4g_mem_size and above_4g_mem_size which is used later in 
> QEMU.
> 
> Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
> Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Please remember to place your Signed-off-by last. In theory you would
place another Signed-off-by last, but in practice we usually drop the
first one if there are no other Sobs. Think of someone taking your
patch, making changes and applying it to some downstream; then Stefano
did not ack the modified patch signed off by someone else, but rather
you are asserting that Stefano acked the patch in the form you are
sending it.

> ---
>  hw/i386/pc_piix.c    | 31 ++++++++++++++++---------------
>  hw/i386/pc_q35.c     | 29 +++++++++++++++--------------
>  include/hw/xen/xen.h |  3 ++-
>  xen-all.c            | 24 ++++++++++++++----------
>  xen-stub.c           |  3 ++-
>  5 files changed, 49 insertions(+), 41 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 7930a26..bd52f6e 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -96,21 +96,6 @@ static void pc_init1(QEMUMachineInitArgs *args,
>      FWCfgState *fw_cfg = NULL;
>      PcGuestInfo *guest_info;
>  
> -    if (xen_enabled() && xen_hvm_init(&ram_memory) != 0) {
> -        fprintf(stderr, "xen hardware virtual machine initialisation 
> failed\n");
> -        exit(1);
> -    }
> -
> -    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> -    object_property_add_child(qdev_get_machine(), "icc-bridge",
> -                              OBJECT(icc_bridge), NULL);
> -
> -    pc_cpus_init(args->cpu_model, icc_bridge);
> -
> -    if (kvm_enabled() && kvmclock_enabled) {
> -        kvmclock_create();
> -    }
> -
>      /* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory).
>       * If it doesn't, we need to split it in chunks below and above 4G.
>       * In any case, try to make sure that guest addresses aligned at
> @@ -127,6 +112,22 @@ static void pc_init1(QEMUMachineInitArgs *args,
>          below_4g_mem_size = args->ram_size;
>      }
>  
> +    if (xen_enabled() && xen_hvm_init(&below_4g_mem_size, &above_4g_mem_size,
> +                                      &ram_memory) != 0) {
> +        fprintf(stderr, "xen hardware virtual machine initialisation 
> failed\n");
> +        exit(1);
> +    }
> +
> +    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> +    object_property_add_child(qdev_get_machine(), "icc-bridge",
> +                              OBJECT(icc_bridge), NULL);
> +
> +    pc_cpus_init(args->cpu_model, icc_bridge);
> +
> +    if (kvm_enabled() && kvmclock_enabled) {
> +        kvmclock_create();
> +    }
> +
>      if (pci_enabled) {
>          pci_memory = g_new(MemoryRegion, 1);
>          memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);

Movement looks okay to me, CC'ing Igor. Did you test KVM or only Xen?

It would be nice to follow up replacing fprintf() with error_report()
though in a separate patch.

> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index c844dc2..6e34fe1 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -83,20 +83,6 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
>      DeviceState *icc_bridge;
>      PcGuestInfo *guest_info;
>  
> -    if (xen_enabled() && xen_hvm_init(&ram_memory) != 0) {
> -        fprintf(stderr, "xen hardware virtual machine initialisation 
> failed\n");
> -        exit(1);
> -    }
> -
> -    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> -    object_property_add_child(qdev_get_machine(), "icc-bridge",
> -                              OBJECT(icc_bridge), NULL);
> -
> -    pc_cpus_init(args->cpu_model, icc_bridge);
> -    pc_acpi_init("q35-acpi-dsdt.aml");
> -
> -    kvmclock_create();
> -
>      /* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory
>       * and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping
>       * also known as MMCFG).
> @@ -115,6 +101,21 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
>          below_4g_mem_size = args->ram_size;
>      }
>  
> +    if (xen_enabled() && xen_hvm_init(&below_4g_mem_size, &above_4g_mem_size,
> +                                      &ram_memory) != 0) {
> +        fprintf(stderr, "xen hardware virtual machine initialisation 
> failed\n");
> +        exit(1);
> +    }
> +
> +    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> +    object_property_add_child(qdev_get_machine(), "icc-bridge",
> +                              OBJECT(icc_bridge), NULL);
> +
> +    pc_cpus_init(args->cpu_model, icc_bridge);
> +    pc_acpi_init("q35-acpi-dsdt.aml");
> +
> +    kvmclock_create();
> +
>      /* pci enabled */
>      if (pci_enabled) {
>          pci_memory = g_new(MemoryRegion, 1);
[snip]

Dito here.

Xen parts look sane to me.

Reviewed-by: Andreas Färber <afaerber@xxxxxxx>

Regards,
Andreas

-- 
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GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

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