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

[Don Slutz <dslutz@xxxxxxxxxxx>]

On 04/18/14 10:23, Andreas Färber wrote:
> 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.
I will try to remember this.  Not sure Xen follows the same
rules.

> > ---
> >   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?
I have tested on one version of KVM (Fedora 17).

> It would be nice to follow up replacing fprintf() with error_report()
> though in a separate patch.
Will do.
   -Don Slutz

> > 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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