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| author | neel <neel@FreeBSD.org> | 2013-02-01 03:49:09 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2013-02-01 03:49:09 +0000 |
| commit | 81de6f5cc49043ac5e2135ad996dfb05f2bd2a32 (patch) | |
| tree | 98f2e96d433580504233a3c13ced43451e5611ed /sys/amd64/vmm/io | |
| parent | 803db8c37c2516174b23103ab861a500599042dc (diff) | |
| download | FreeBSD-src-81de6f5cc49043ac5e2135ad996dfb05f2bd2a32.zip FreeBSD-src-81de6f5cc49043ac5e2135ad996dfb05f2bd2a32.tar.gz | |
Fix a broken assumption in the passthru implementation that the MSI-X table
can only be located at the beginning or the end of the BAR.
If the MSI-table is located in the middle of a BAR then we will split the
BAR into two and create two mappings - one before the table and one after
the table - leaving a hole in place of the table so accesses to it can be
trapped and emulated.
Obtained from: NetApp
Diffstat (limited to 'sys/amd64/vmm/io')
| -rw-r--r-- | sys/amd64/vmm/io/ppt.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/amd64/vmm/io/ppt.c b/sys/amd64/vmm/io/ppt.c index d3ec8d1..4a05985 100644 --- a/sys/amd64/vmm/io/ppt.c +++ b/sys/amd64/vmm/io/ppt.c @@ -56,9 +56,18 @@ __FBSDID("$FreeBSD$"); /* XXX locking */ #define MAX_PPTDEVS (sizeof(pptdevs) / sizeof(pptdevs[0])) -#define MAX_MMIOSEGS (PCIR_MAX_BAR_0 + 1) #define MAX_MSIMSGS 32 +/* + * If the MSI-X table is located in the middle of a BAR then that MMIO + * region gets split into two segments - one segment above the MSI-X table + * and the other segment below the MSI-X table - with a hole in place of + * the MSI-X table so accesses to it can be trapped and emulated. + * + * So, allocate a MMIO segment for each BAR register + 1 additional segment. + */ +#define MAX_MMIOSEGS ((PCIR_MAX_BAR_0 + 1) + 1) + MALLOC_DEFINE(M_PPTMSIX, "pptmsix", "Passthru MSI-X resources"); struct pptintr_arg { /* pptintr(pptintr_arg) */ |
