From: "André Przywara" <andre.przywara@arm.com>
To: Alexandru Elisei <alexandru.elisei@arm.com>, kvm@vger.kernel.org
Cc: will@kernel.org, julien.thierry.kdev@gmail.com,
sami.mujawar@arm.com, lorenzo.pieralisi@arm.com,
Julien Thierry <julien.thierry@arm.com>
Subject: Re: [PATCH v3 kvmtool 08/32] pci: Fix ioport allocation size
Date: Mon, 30 Mar 2020 10:27:47 +0100 [thread overview]
Message-ID: <0dc3bf33-d2e0-66f7-c399-0585e744307b@arm.com> (raw)
In-Reply-To: <20200326152438.6218-9-alexandru.elisei@arm.com>
On 26/03/2020 15:24, Alexandru Elisei wrote:
> From: Julien Thierry <julien.thierry@arm.com>
Hi,
> The PCI Local Bus Specification, Rev. 3.0,
> Section 6.2.5.1. "Address Maps" states:
> "Devices that map control functions into I/O Space must not consume more
> than 256 bytes per I/O Base Address register."
>
> Yet all the PCI devices allocate IO ports of IOPORT_SIZE (= 1024 bytes).
>
> Fix this by having PCI devices use 256 bytes ports for IO BARs.
>
> There is no hard requirement on the size of the memory region described
> by memory BARs. Since BAR 1 is supposed to offer the same functionality as
> IO ports, let's make its size match BAR 0.
>
> Signed-off-by: Julien Thierry <julien.thierry@arm.com>
> [Added rationale for changing BAR1 size to PCI_IO_SIZE]
> Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Cheers,
Andre
> ---
> hw/vesa.c | 4 ++--
> include/kvm/ioport.h | 1 -
> pci.c | 2 +-
> virtio/pci.c | 15 +++++++--------
> 4 files changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/hw/vesa.c b/hw/vesa.c
> index 24fb46faad3b..d8d91aa9c873 100644
> --- a/hw/vesa.c
> +++ b/hw/vesa.c
> @@ -63,8 +63,8 @@ struct framebuffer *vesa__init(struct kvm *kvm)
>
> if (!kvm->cfg.vnc && !kvm->cfg.sdl && !kvm->cfg.gtk)
> return NULL;
> - r = pci_get_io_port_block(IOPORT_SIZE);
> - r = ioport__register(kvm, r, &vesa_io_ops, IOPORT_SIZE, NULL);
> + r = pci_get_io_port_block(PCI_IO_SIZE);
> + r = ioport__register(kvm, r, &vesa_io_ops, PCI_IO_SIZE, NULL);
> if (r < 0)
> return ERR_PTR(r);
>
> diff --git a/include/kvm/ioport.h b/include/kvm/ioport.h
> index b10fcd5b4412..8c86b7151f25 100644
> --- a/include/kvm/ioport.h
> +++ b/include/kvm/ioport.h
> @@ -14,7 +14,6 @@
>
> /* some ports we reserve for own use */
> #define IOPORT_DBG 0xe0
> -#define IOPORT_SIZE 0x400
>
> struct kvm;
>
> diff --git a/pci.c b/pci.c
> index 80b5c5d3d7f3..b6892d974c08 100644
> --- a/pci.c
> +++ b/pci.c
> @@ -20,7 +20,7 @@ static u16 io_port_blocks = PCI_IOPORT_START;
>
> u16 pci_get_io_port_block(u32 size)
> {
> - u16 port = ALIGN(io_port_blocks, IOPORT_SIZE);
> + u16 port = ALIGN(io_port_blocks, PCI_IO_SIZE);
>
> io_port_blocks = port + size;
> return port;
> diff --git a/virtio/pci.c b/virtio/pci.c
> index d73414abde05..eeb5b5efa6e1 100644
> --- a/virtio/pci.c
> +++ b/virtio/pci.c
> @@ -421,7 +421,7 @@ static void virtio_pci__io_mmio_callback(struct kvm_cpu *vcpu,
> {
> struct virtio_pci *vpci = ptr;
> int direction = is_write ? KVM_EXIT_IO_OUT : KVM_EXIT_IO_IN;
> - u16 port = vpci->port_addr + (addr & (IOPORT_SIZE - 1));
> + u16 port = vpci->port_addr + (addr & (PCI_IO_SIZE - 1));
>
> kvm__emulate_io(vcpu, port, data, direction, len, 1);
> }
> @@ -435,17 +435,16 @@ int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev,
> vpci->kvm = kvm;
> vpci->dev = dev;
>
> - BUILD_BUG_ON(!is_power_of_two(IOPORT_SIZE));
> BUILD_BUG_ON(!is_power_of_two(PCI_IO_SIZE));
>
> - r = pci_get_io_port_block(IOPORT_SIZE);
> - r = ioport__register(kvm, r, &virtio_pci__io_ops, IOPORT_SIZE, vdev);
> + r = pci_get_io_port_block(PCI_IO_SIZE);
> + r = ioport__register(kvm, r, &virtio_pci__io_ops, PCI_IO_SIZE, vdev);
> if (r < 0)
> return r;
> vpci->port_addr = (u16)r;
>
> - vpci->mmio_addr = pci_get_mmio_block(IOPORT_SIZE);
> - r = kvm__register_mmio(kvm, vpci->mmio_addr, IOPORT_SIZE, false,
> + vpci->mmio_addr = pci_get_mmio_block(PCI_IO_SIZE);
> + r = kvm__register_mmio(kvm, vpci->mmio_addr, PCI_IO_SIZE, false,
> virtio_pci__io_mmio_callback, vpci);
> if (r < 0)
> goto free_ioport;
> @@ -475,8 +474,8 @@ int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev,
> | PCI_BASE_ADDRESS_SPACE_MEMORY),
> .status = cpu_to_le16(PCI_STATUS_CAP_LIST),
> .capabilities = (void *)&vpci->pci_hdr.msix - (void *)&vpci->pci_hdr,
> - .bar_size[0] = cpu_to_le32(IOPORT_SIZE),
> - .bar_size[1] = cpu_to_le32(IOPORT_SIZE),
> + .bar_size[0] = cpu_to_le32(PCI_IO_SIZE),
> + .bar_size[1] = cpu_to_le32(PCI_IO_SIZE),
> .bar_size[2] = cpu_to_le32(PCI_IO_SIZE*2),
> };
>
>
next prev parent reply other threads:[~2020-03-30 9:28 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 15:24 [PATCH v3 kvmtool 00/32] Add reassignable BARs and PCIE 1.1 support Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 01/32] Makefile: Use correct objcopy binary when cross-compiling for x86_64 Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 02/32] hw/i8042: Compile only for x86 Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 03/32] pci: Fix BAR resource sizing arbitration Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 04/32] Remove pci-shmem device Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 05/32] Check that a PCI device's memory size is power of two Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 06/32] arm/pci: Advertise only PCI bus 0 in the DT Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 07/32] ioport: pci: Move port allocations to PCI devices Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 08/32] pci: Fix ioport allocation size Alexandru Elisei
2020-03-30 9:27 ` André Przywara [this message]
2020-03-26 15:24 ` [PATCH v3 kvmtool 09/32] virtio/pci: Make memory and IO BARs independent Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 10/32] vfio/pci: Allocate correct size for MSIX table and PBA BARs Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 11/32] vfio/pci: Don't assume that only even numbered BARs are 64bit Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 12/32] vfio/pci: Ignore expansion ROM BAR writes Alexandru Elisei
2020-03-30 9:29 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 13/32] vfio/pci: Don't access unallocated regions Alexandru Elisei
2020-03-30 9:29 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 14/32] virtio: Don't ignore initialization failures Alexandru Elisei
2020-03-30 9:30 ` André Przywara
2020-04-14 10:27 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 15/32] Don't ignore errors registering a device, ioport or mmio emulation Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 16/32] hw/vesa: Don't ignore fatal errors Alexandru Elisei
2020-03-30 9:30 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 17/32] hw/vesa: Set the size for BAR 0 Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 18/32] ioport: Fail when registering overlapping ports Alexandru Elisei
2020-03-30 11:13 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 19/32] ioport: mmio: Use a mutex and reference counting for locking Alexandru Elisei
2020-03-31 11:51 ` André Przywara
2020-05-01 15:30 ` Alexandru Elisei
2020-05-06 17:40 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 20/32] pci: Add helpers for BAR values and memory/IO space access Alexandru Elisei
2020-04-02 8:33 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 21/32] virtio/pci: Get emulated region address from BARs Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 22/32] vfio: Destroy memslot when unmapping the associated VAs Alexandru Elisei
2020-04-02 8:33 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 23/32] vfio: Reserve ioports when configuring the BAR Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 24/32] pci: Limit configuration transaction size to 32 bits Alexandru Elisei
2020-04-02 8:34 ` André Przywara
2020-05-04 13:00 ` Alexandru Elisei
2020-05-04 13:37 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 25/32] vfio/pci: Don't write configuration value twice Alexandru Elisei
2020-04-02 8:35 ` André Przywara
2020-05-04 13:44 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 26/32] vesa: Create device exactly once Alexandru Elisei
2020-04-02 8:58 ` André Przywara
2020-05-05 13:02 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 27/32] pci: Implement callbacks for toggling BAR emulation Alexandru Elisei
2020-04-03 11:57 ` André Przywara
2020-04-03 18:14 ` Alexandru Elisei
2020-04-03 19:08 ` André Przywara
2020-05-05 13:30 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 28/32] pci: Toggle BAR I/O and memory space emulation Alexandru Elisei
2020-04-06 14:03 ` André Przywara
2020-03-26 15:24 ` [PATCH v3 kvmtool 29/32] pci: Implement reassignable BARs Alexandru Elisei
2020-04-06 14:05 ` André Przywara
2020-05-06 12:05 ` Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 30/32] arm/fdt: Remove 'linux,pci-probe-only' property Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 31/32] vfio: Trap MMIO access to BAR addresses which aren't page aligned Alexandru Elisei
2020-03-26 15:24 ` [PATCH v3 kvmtool 32/32] arm/arm64: Add PCI Express 1.1 support Alexandru Elisei
2020-04-06 14:06 ` André Przywara
2020-04-14 8:56 ` Alexandru Elisei
2020-05-06 13:51 ` Alexandru Elisei
2020-05-12 14:17 ` André Przywara
2020-05-12 15:44 ` Alexandru Elisei
2020-05-13 8:17 ` André Przywara
2020-05-13 14:42 ` Alexandru Elisei
2021-06-04 16:46 ` Alexandru Elisei
2020-04-06 14:14 ` [PATCH v3 kvmtool 00/32] Add reassignable BARs and PCIE " André Przywara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0dc3bf33-d2e0-66f7-c399-0585e744307b@arm.com \
--to=andre.przywara@arm.com \
--cc=alexandru.elisei@arm.com \
--cc=julien.thierry.kdev@gmail.com \
--cc=julien.thierry@arm.com \
--cc=kvm@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=sami.mujawar@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).