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Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI h
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug |
Date: |
Wed, 18 May 2016 17:14:50 +0300 |
On Sun, May 15, 2016 at 10:23:32PM +0300, Marcel Apfelbaum wrote:
> Using the firmware assigned MMIO ranges for 64-bit PCI window
> leads to zero space for hot-plugging PCI devices over 4G.
>
> PC machines can use the whole CPU addressable range after
> the space reserved for memory-hotplug.
>
> Signed-off-by: Marcel Apfelbaum <address@hidden>
> ---
> hw/pci/pci.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index bb605ef..44dd949 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -41,6 +41,7 @@
> #include "hw/hotplug.h"
> #include "hw/boards.h"
> #include "qemu/cutils.h"
> +#include "hw/i386/pc.h"
>
> //#define DEBUG_PCI
> #ifdef DEBUG_PCI
I don't want pci to depend on PC.
Pls find another way to do this.
> @@ -2467,8 +2468,19 @@ static void pci_dev_get_w64(PCIBus *b, PCIDevice *dev,
> void *opaque)
>
> void pci_bus_get_w64_range(PCIBus *bus, Range *range)
> {
> - range->begin = range->end = 0;
> - pci_for_each_device_under_bus(bus, pci_dev_get_w64, range);
> + Object *machine = qdev_get_machine();
An empty line won't hurt here after the declaration.
> + if (object_dynamic_cast(machine, TYPE_PC_MACHINE)) {
> + PCMachineState *pcms = PC_MACHINE(machine);
An empty line won't hurt here after the declaration.
> + range->begin = pc_machine_get_reserved_memory_end(pcms);
> + if (!range->begin) {
> + range->begin = ROUND_UP(0x100000000ULL + pcms->above_4g_mem_size,
> + 1ULL << 30);
Why 30? what is the logic here?
> + }
> + range->end = 1ULL << 40; /* 40 bits physical */
This comment does not help. Physical what? And why is 40 bit right?
> + } else {
> + range->begin = range->end = 0;
> + pci_for_each_device_under_bus(bus, pci_dev_get_w64, range);
When does this trigger?
Pls add a comment.
> + }
> }
>
> static bool pcie_has_upstream_port(PCIDevice *dev)
> --
> 2.4.3
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, (continued)
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Igor Mammedov, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Laszlo Ersek, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Marcel Apfelbaum, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Michael S. Tsirkin, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Marcel Apfelbaum, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Igor Mammedov, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Marcel Apfelbaum, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Michael S. Tsirkin, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Marcel Apfelbaum, 2016/05/18
- Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug, Michael S. Tsirkin, 2016/05/18
Re: [Qemu-devel] [PATCH V2 2/4] pci: reserve 64 bit MMIO range for PCI hotplug,
Michael S. Tsirkin <=
[Qemu-devel] [PATCH V2 1/4] hw/pc: extract reserved memory end computation to a standalone function, Marcel Apfelbaum, 2016/05/15
[Qemu-devel] [PATCH V2 3/4] acpi: refactor pxb crs computation, Marcel Apfelbaum, 2016/05/15
[Qemu-devel] [PATCH V2 4/4] hw/apci: handle 64-bit MMIO regions correctly, Marcel Apfelbaum, 2016/05/15