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| author | Jan Beulich <jbeulich@suse.com> | 2013-05-02 16:46:02 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2013-05-02 16:46:02 +0200 |
| commit | d1222afda4d27916580c28533762e362d64ace22 (patch) | |
| tree | bb948d8c28906c1ad2fc11d80f64748631352052 /xen/drivers | |
| parent | b8efae696c9a2d46e91fa0eda739427efc16c250 (diff) | |
| download | xen-d1222afda4d27916580c28533762e362d64ace22.tar.gz xen-d1222afda4d27916580c28533762e362d64ace22.tar.bz2 xen-d1222afda4d27916580c28533762e362d64ace22.zip | |
x86: allow Dom0 read-only access to IO-APICs
There are BIOSes that want to map the IO-APIC MMIO region from some
ACPI method(s), and there is at least one BIOS flavor that wants to
use this mapping to clear an RTE's mask bit. While we can't allow the
latter, we can permit reads and simply drop write attempts, leveraging
the already existing infrastructure introduced for dealing with AMD
IOMMUs' representation as PCI devices.
This fixes an interrupt setup problem on a system where _CRS evaluation
involved the above described BIOS/ACPI behavior, and is expected to
also deal with a boot time crash of pv-ops Linux upon encountering the
same kind of system.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/drivers')
| -rw-r--r-- | xen/drivers/passthrough/io.c | 2 | ||||
| -rw-r--r-- | xen/drivers/passthrough/pci.c | 2 |
2 files changed, 0 insertions, 4 deletions
diff --git a/xen/drivers/passthrough/io.c b/xen/drivers/passthrough/io.c index 13002c0c9d..f64e4ac775 100644 --- a/xen/drivers/passthrough/io.c +++ b/xen/drivers/passthrough/io.c @@ -27,8 +27,6 @@ #include <xen/hvm/irq.h> #include <xen/tasklet.h> -struct rangeset *__read_mostly mmio_ro_ranges; - static void hvm_dirq_assist(unsigned long _d); bool_t pt_irq_need_timer(uint32_t flags) diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index 9635d93ad4..f2756c954a 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -105,8 +105,6 @@ void __init pt_pci_init(void) radix_tree_init(&pci_segments); if ( !alloc_pseg(0) ) panic("Could not initialize PCI segment 0\n"); - mmio_ro_ranges = rangeset_new(NULL, "r/o mmio ranges", - RANGESETF_prettyprint_hex); } int __init pci_add_segment(u16 seg) |