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From: Alexandru Elisei <alexandru.elisei@arm.com>
To: kvm@vger.kernel.org
Cc: will@kernel.org, julien.thierry.kdev@gmail.com,
	andre.przywara@arm.com, sami.mujawar@arm.com,
	lorenzo.pieralisi@arm.com
Subject: [PATCH kvmtool 09/16] arm/pci: Do not use first PCI IO space bytes for devices
Date: Mon, 25 Nov 2019 10:30:26 +0000	[thread overview]
Message-ID: <20191125103033.22694-10-alexandru.elisei@arm.com> (raw)
In-Reply-To: <20191125103033.22694-1-alexandru.elisei@arm.com>

From: Julien Thierry <julien.thierry@arm.com>

Linux has this convention that the lower 0x1000 bytes of the IO space
should not be used. (cf PCIBIOS_MIN_IO).

Just allocate those bytes to prevent future allocation assigning it to
devices.

Cc: julien.thierry.kdev@gmail.com
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arm/pci.c b/arm/pci.c
index 1c0949a22408..4e6467357ce8 100644
--- a/arm/pci.c
+++ b/arm/pci.c
@@ -37,6 +37,9 @@ void pci__arm_init(struct kvm *kvm)
 
 	/* Make PCI port allocation start at a properly aligned address */
 	pci_get_io_port_block(align_pad);
+
+	/* Convention, don't allocate first 0x1000 bytes of PCI IO */
+	pci_get_io_port_block(0x1000);
 }
 
 void pci__generate_fdt_nodes(void *fdt)
-- 
2.20.1


  parent reply	other threads:[~2019-11-25 10:32 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-25 10:30 [PATCH kvmtool 00/16] Add writable BARs and PCIE 1.1 support Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 01/16] Makefile: Use correct objcopy binary when cross-compiling for x86_64 Alexandru Elisei
2019-11-27 18:23   ` Andre Przywara
2019-11-25 10:30 ` [PATCH kvmtool 02/16] pci: Fix BAR resource sizing arbitration Alexandru Elisei
2019-11-27 18:24   ` Andre Przywara
2019-11-28  9:37     ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 03/16] Remove pci-shmem device Alexandru Elisei
2019-11-27 18:24   ` Andre Przywara
2019-11-25 10:30 ` [PATCH kvmtool 04/16] Check that a PCI device's memory size is power of two Alexandru Elisei
2019-11-27 18:25   ` Andre Przywara
2020-01-15 12:43     ` Alexandru Elisei
2020-01-15 14:07       ` Andre Przywara
2020-01-15 15:00         ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 05/16] arm: pci.c: Advertise only PCI bus 0 in the DT Alexandru Elisei
2019-11-28 17:43   ` Andre Przywara
2020-01-15 14:49     ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 06/16] ioport: pci: Move port allocations to PCI devices Alexandru Elisei
2020-01-28 18:25   ` Andre Przywara
2020-01-29 10:07     ` Alexandru Elisei
2020-01-29 10:29       ` Andre Przywara
2019-11-25 10:30 ` [PATCH kvmtool 07/16] pci: Fix ioport allocation size Alexandru Elisei
2020-01-28 18:26   ` Andre Przywara
2020-01-29 11:11     ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 08/16] arm/pci: Fix PCI IO region Alexandru Elisei
2019-11-25 10:30 ` Alexandru Elisei [this message]
2019-12-02 12:15   ` [PATCH kvmtool 09/16] arm/pci: Do not use first PCI IO space bytes for devices Lorenzo Pieralisi
2020-01-15 15:08     ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 10/16] virtio/pci: Make memory and IO BARs independent Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 11/16] virtio/pci: Ignore MMIO and I/O accesses when they are disabled Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 12/16] Use independent read/write locks for ioport and mmio Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 13/16] vfio: Add support for BAR configuration Alexandru Elisei
2019-11-29 17:05   ` Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 14/16] virtio/pci: " Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 15/16] arm/fdt: Remove 'linux,pci-probe-only' property Alexandru Elisei
2019-11-25 10:30 ` [PATCH kvmtool 16/16] Add PCI Express 1.1 support Alexandru Elisei
2019-11-28 17:41 ` [PATCH kvmtool 00/16] Add writable BARs and PCIE " Lorenzo Pieralisi
2020-01-15 15:10   ` Alexandru Elisei

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