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From f38f51d422e82d1241b678960dd6a033ffa398da Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Wed, 21 Apr 2021 22:30:05 -0400
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Subject: [PATCH 6/7] xhci: fix valid.max_access_size to access address
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registers
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20210421223006.19650-6-jmaloy@redhat.com>
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Patchwork-id: 101483
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O-Subject: [RHEL-8.5.0 qemu-kvm PATCH v2 5/6] xhci: fix valid.max_access_size to access address registers
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Bugzilla: 1842478
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Laurent Vivier <lvivier@redhat.com>
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QEMU XHCI advertises AC64 (64-bit addressing) but doesn't allow
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64-bit mode access in "runtime" and "operational" MemoryRegionOps.
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Set the max_access_size based on sizeof(dma_addr_t) as AC64 is set.
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XHCI specs:
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"If the xHC supports 64-bit addressing (AC64 = ‘1’), then software
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should write 64-bit registers using only Qword accesses. If a
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system is incapable of issuing Qword accesses, then writes to the
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64-bit address fields shall be performed using 2 Dword accesses;
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low Dword-first, high-Dword second. If the xHC supports 32-bit
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addressing (AC64 = ‘0’), then the high Dword of registers containing
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64-bit address fields are unused and software should write addresses
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using only Dword accesses"
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The problem has been detected with SLOF, as linux kernel always accesses
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registers using 32-bit access even if AC64 is set and revealed by
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5d971f9e6725 ("memory: Revert "memory: accept mismatching sizes in memory_region_access_valid"")
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Suggested-by: Alexey Kardashevskiy <aik@au1.ibm.com>
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Message-id: 20200721083322.90651-1-lvivier@redhat.com
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 8e67fda2dd6202ccec093fda561107ba14830a17)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/usb/hcd-xhci.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
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index 646c78cde9..ab449bb003 100644
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--- a/hw/usb/hcd-xhci.c
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+++ b/hw/usb/hcd-xhci.c
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@@ -3183,7 +3183,7 @@ static const MemoryRegionOps xhci_oper_ops = {
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.read = xhci_oper_read,
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.write = xhci_oper_write,
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.valid.min_access_size = 4,
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- .valid.max_access_size = 4,
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+ .valid.max_access_size = sizeof(dma_addr_t),
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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@@ -3199,7 +3199,7 @@ static const MemoryRegionOps xhci_runtime_ops = {
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.read = xhci_runtime_read,
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.write = xhci_runtime_write,
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.valid.min_access_size = 4,
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- .valid.max_access_size = 4,
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+ .valid.max_access_size = sizeof(dma_addr_t),
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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--
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2.27.0
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