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DISCONTINUED:openSUSE:11.1:Update
xen
19230-vtd-mobile-series4-chipset.patch
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File 19230-vtd-mobile-series4-chipset.patch of Package xen
# HG changeset patch # User Keir Fraser <keir.fraser@citrix.com> # Date 1235041183 0 # Node ID bd991b0431aad9a0e8631a09da138a4961117ef3 # Parent 0c61a377c6278c0d124617a86abfa37eba201d17 vt-d: workaround for Mobile Series 4 Chipset Incorporated VT-d workaround for a sighting on Intel Mobile Series 4 chipset found in Linux iommu. The sighting is the chipset is not reporting write buffer flush capability correctly. Signed-off-by: Allen Kay <allen.m.kay@intel.com> Index: xen-3.3.1-testing/xen/drivers/passthrough/vtd/iommu.c =================================================================== --- xen-3.3.1-testing.orig/xen/drivers/passthrough/vtd/iommu.c +++ xen-3.3.1-testing/xen/drivers/passthrough/vtd/iommu.c @@ -41,6 +41,7 @@ static spinlock_t domid_bitmap_lock; /* protect domain id bitmap */ static int domid_bitmap_size; /* domain id bitmap size in bits */ static unsigned long *domid_bitmap; /* iommu domain id bitmap */ +static bool_t rwbf_quirk; static void setup_dom0_devices(struct domain *d); static void setup_dom0_rmrr(struct domain *d); @@ -263,7 +264,7 @@ static void iommu_flush_write_buffer(str unsigned long flag; s_time_t start_time; - if ( !cap_rwbf(iommu->cap) ) + if ( !rwbf_quirk && !cap_rwbf(iommu->cap) ) return; val = iommu->gcmd | DMA_GCMD_WBF; @@ -1782,6 +1783,19 @@ static void setup_dom0_rmrr(struct domai } } +static void platform_quirks(void) +{ + u32 id; + + /* Mobile 4 Series Chipset neglects to set RWBF capability. */ + id = pci_conf_read32(0, 0, 0, 0); + if ( id == 0x2a408086 ) + { + dprintk(XENLOG_INFO VTDPREFIX, "DMAR: Forcing write-buffer flush\n"); + rwbf_quirk = 1; + } +} + int intel_vtd_setup(void) { struct acpi_drhd_unit *drhd; @@ -1790,6 +1804,8 @@ int intel_vtd_setup(void) if ( !vtd_enabled ) return -ENODEV; + platform_quirks(); + spin_lock_init(&domid_bitmap_lock); clflush_size = get_clflush_size();
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