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Re: [Qemu-devel] [PATCH v3 1/2] x86_iommu: Move machine check to x86_iom
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH v3 1/2] x86_iommu: Move machine check to x86_iommu_realize() |
Date: |
Mon, 18 Sep 2017 10:13:55 -0300 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Mon, Sep 18, 2017 at 12:14:08PM +0200, Mohammed Gamal wrote:
> Instead of having the same error checks in vtd_realize()
> and amdvi_realize(), move that over to the generic
> x86_iommu_realize().
>
> Signed-off-by: Mohammed Gamal <address@hidden>
> ---
> hw/i386/amd_iommu.c | 10 +---------
> hw/i386/intel_iommu.c | 10 +---------
> hw/i386/x86-iommu.c | 12 ++++++++++++
> 3 files changed, 14 insertions(+), 18 deletions(-)
>
> diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
> index 334938a..839f01f 100644
> --- a/hw/i386/amd_iommu.c
> +++ b/hw/i386/amd_iommu.c
> @@ -1141,18 +1141,10 @@ static void amdvi_realize(DeviceState *dev, Error
> **err)
> AMDVIState *s = AMD_IOMMU_DEVICE(dev);
> X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
> MachineState *ms = MACHINE(qdev_get_machine());
> - MachineClass *mc = MACHINE_GET_CLASS(ms);
> PCMachineState *pcms =
> PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
This is where you shouldn't use object_dynamic_cast() because the
code now expects pcms to never be NULL...
> - PCIBus *bus;
> + PCIBus *bus = pcms->bus;
>
> - if (!pcms) {
> - error_setg(err, "Machine-type '%s' not supported by amd-iommu",
> - mc->name);
> - return;
> - }
> -
> - bus = pcms->bus;
> s->iotlb = g_hash_table_new_full(amdvi_uint64_hash,
> amdvi_uint64_equal, g_free, g_free);
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 3a5bb0b..aa01812 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -3027,20 +3027,12 @@ static bool vtd_decide_config(IntelIOMMUState *s,
> Error **errp)
> static void vtd_realize(DeviceState *dev, Error **errp)
> {
> MachineState *ms = MACHINE(qdev_get_machine());
> - MachineClass *mc = MACHINE_GET_CLASS(ms);
> PCMachineState *pcms =
> PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
Same as above.
> - PCIBus *bus;
> + PCIBus *bus = pcms->bus;
> IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev);
> X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
>
> - if (!pcms) {
> - error_setg(errp, "Machine-type '%s' not supported by intel-iommu",
> - mc->name);
> - return;
> - }
> -
> - bus = pcms->bus;
> x86_iommu->type = TYPE_INTEL;
>
> if (!vtd_decide_config(s, errp)) {
> diff --git a/hw/i386/x86-iommu.c b/hw/i386/x86-iommu.c
> index 293caf8..d43b08a 100644
> --- a/hw/i386/x86-iommu.c
> +++ b/hw/i386/x86-iommu.c
> @@ -21,6 +21,8 @@
> #include "hw/sysbus.h"
> #include "hw/boards.h"
> #include "hw/i386/x86-iommu.h"
> +#include "hw/i386/pc.h"
> +#include "qapi/error.h"
> #include "qemu/error-report.h"
> #include "trace.h"
>
> @@ -80,7 +82,17 @@ static void x86_iommu_realize(DeviceState *dev, Error
> **errp)
> {
> X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
> X86IOMMUClass *x86_class = X86_IOMMU_GET_CLASS(dev);
> + MachineState *ms = MACHINE(qdev_get_machine());
> + MachineClass *mc = MACHINE_GET_CLASS(ms);
> + PCMachineState *pcms = PC_MACHINE(ms);
And here is where you really need object_dynamic_cast(),
otherwise the "if (!pcms)" check below will be useless and you'll
get this:
$ qemu-system-x86_64 -machine none -device intel-iommu
qemu/hw/i386/x86-iommu.c:87:x86_iommu_realize: Object 0x53d7d02060 is not an
instance of type generic-pc-machine
Aborted (core dumped)
> QLIST_INIT(&x86_iommu->iec_notifiers);
> +
> + if (!pcms) {
> + error_setg(errp, "Machine-type '%s' not supported by IOMMU",
> + mc->name);
> + return;
> + }
> +
> if (x86_class->realize) {
> x86_class->realize(dev, errp);
> }
> --
> 1.8.3.1
>
--
Eduardo