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openSUSE:Leap:15.5:Update
xen.25150
5d8b736d-AMD-IOMMU-replace-INTREMAP_ENTRIES.patch
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File 5d8b736d-AMD-IOMMU-replace-INTREMAP_ENTRIES.patch of Package xen.25150
References: bsc#1135799 # Commit bb038f311687554483fb997cfee213760029aeaf # Date 2019-09-25 16:02:21 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> AMD/IOMMU: replace INTREMAP_ENTRIES Prepare for the number of entries to not be the maximum possible, by separating checks against maximum size from ones against actual size. For caller side simplicity have alloc_intremap_entry() return the maximum possible value upon allocation failure, rather than the first just out-of-bounds one. Have the involved functions already take all the subsequently needed arguments here already, to reduce code churn in the patch actually making the allocation size dynamic. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> # Commit 85e1424de2dda289a4ee92e6b4f5328dd10e75ae # Date 2019-11-13 14:32:44 +0000 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> AMD/IOMMU: Fix crash in 'V' debugkey c/s bb038f31168 "AMD/IOMMU: replace INTREMAP_ENTRIES" introduces a call to intremap_table_entries() in dump_intremap_table() before tbl.ptr is checked for NULL. intremap_table_entries() internally uses virt_to_page() which falls over ASSERT(va >= XEN_VIRT_START); in __virt_to_page(). Reported-by: Igor Druzhinin <igor.druzhinin@citrix.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/drivers/passthrough/amd/iommu_intr.c +++ b/xen/drivers/passthrough/amd/iommu_intr.c @@ -69,7 +69,7 @@ union irte_cptr { const union irte128 *ptr128; } __transparent__; -#define INTREMAP_ENTRIES (1 << IOMMU_INTREMAP_ORDER) +#define INTREMAP_MAX_ENTRIES (1 << IOMMU_INTREMAP_ORDER) struct ioapic_sbdf ioapic_sbdf[MAX_IO_APICS]; struct hpet_sbdf hpet_sbdf; @@ -83,8 +83,20 @@ static void dump_intremap_tables(unsigne static unsigned int __init intremap_table_order(const struct amd_iommu *iommu) { return iommu->ctrl.ga_en - ? get_order_from_bytes(INTREMAP_ENTRIES * sizeof(union irte128)) - : get_order_from_bytes(INTREMAP_ENTRIES * sizeof(union irte32)); + ? get_order_from_bytes(INTREMAP_MAX_ENTRIES * sizeof(union irte128)) + : get_order_from_bytes(INTREMAP_MAX_ENTRIES * sizeof(union irte32)); +} + +unsigned int amd_iommu_intremap_table_order( + const void *irt, const struct amd_iommu *iommu) +{ + return IOMMU_INTREMAP_ORDER; +} + +static unsigned int intremap_table_entries( + const void *irt, const struct amd_iommu *iommu) +{ + return 1u << amd_iommu_intremap_table_order(irt, iommu); } unsigned int ioapic_id_to_index(unsigned int apic_id) @@ -122,20 +134,24 @@ static int get_intremap_requestor_id(int return get_ivrs_mappings(seg)[bdf].dte_requestor_id; } -static unsigned int alloc_intremap_entry(int seg, int bdf, unsigned int nr) +static unsigned int alloc_intremap_entry(const struct amd_iommu *iommu, + unsigned int bdf, unsigned int nr) { - unsigned long *inuse = get_ivrs_mappings(seg)[bdf].intremap_inuse; - unsigned int slot = find_first_zero_bit(inuse, INTREMAP_ENTRIES); + const struct ivrs_mappings *ivrs_mappings = get_ivrs_mappings(iommu->seg); + unsigned long *inuse = ivrs_mappings[bdf].intremap_inuse; + unsigned int nr_ents = + intremap_table_entries(ivrs_mappings[bdf].intremap_table, iommu); + unsigned int slot = find_first_zero_bit(inuse, nr_ents); for ( ; ; ) { unsigned int end; - if ( slot >= INTREMAP_ENTRIES ) + if ( slot >= nr_ents ) break; - end = find_next_bit(inuse, INTREMAP_ENTRIES, slot + 1); - if ( end > INTREMAP_ENTRIES ) - end = INTREMAP_ENTRIES; + end = find_next_bit(inuse, nr_ents, slot + 1); + if ( end > nr_ents ) + end = nr_ents; slot = (slot + nr - 1) & ~(nr - 1); if ( slot + nr <= end ) { @@ -144,12 +160,12 @@ static unsigned int alloc_intremap_entry break; } slot = (end + nr) & ~(nr - 1); - if ( slot >= INTREMAP_ENTRIES ) + if ( slot >= nr_ents ) break; - slot = find_next_zero_bit(inuse, INTREMAP_ENTRIES, slot); + slot = find_next_zero_bit(inuse, nr_ents, slot); } - return slot; + return slot < nr_ents ? slot : INTREMAP_MAX_ENTRIES; } static union irte_ptr get_intremap_entry(const struct amd_iommu *iommu, @@ -159,7 +175,7 @@ static union irte_ptr get_intremap_entry .ptr = get_ivrs_mappings(iommu->seg)[bdf].intremap_table }; - ASSERT(table.ptr && (index < INTREMAP_ENTRIES)); + ASSERT(table.ptr && (index < intremap_table_entries(table.ptr, iommu))); if ( iommu->ctrl.ga_en ) table.ptr128 += index; @@ -279,10 +295,10 @@ static int update_intremap_entry_from_io spin_lock_irqsave(lock, flags); offset = *index; - if ( offset >= INTREMAP_ENTRIES ) + if ( offset >= INTREMAP_MAX_ENTRIES ) { - offset = alloc_intremap_entry(iommu->seg, req_id, 1); - if ( offset >= INTREMAP_ENTRIES ) + offset = alloc_intremap_entry(iommu, req_id, 1); + if ( offset >= INTREMAP_MAX_ENTRIES ) { spin_unlock_irqrestore(lock, flags); rte->mask = 1; @@ -400,8 +416,8 @@ int __init amd_iommu_setup_ioapic_remapp } spin_lock_irqsave(lock, flags); - offset = alloc_intremap_entry(seg, req_id, 1); - BUG_ON(offset >= INTREMAP_ENTRIES); + offset = alloc_intremap_entry(iommu, req_id, 1); + BUG_ON(offset >= INTREMAP_MAX_ENTRIES); entry = get_intremap_entry(iommu, req_id, offset); update_intremap_entry(iommu, entry, vector, delivery_mode, dest_mode, dest); @@ -476,7 +492,7 @@ void amd_iommu_ioapic_update_ire( *(((u32 *)&new_rte) + 1) = value; } - if ( ioapic_sbdf[idx].pin_2_idx[pin] >= INTREMAP_ENTRIES ) + if ( ioapic_sbdf[idx].pin_2_idx[pin] >= INTREMAP_MAX_ENTRIES ) { ASSERT(saved_mask); @@ -548,7 +564,7 @@ unsigned int amd_iommu_read_ioapic_from_ return val; offset = ioapic_sbdf[idx].pin_2_idx[pin]; - if ( offset >= INTREMAP_ENTRIES ) + if ( offset >= INTREMAP_MAX_ENTRIES ) return val; seg = ioapic_sbdf[idx].seg; @@ -561,8 +577,8 @@ unsigned int amd_iommu_read_ioapic_from_ if ( !(reg & 1) ) { - ASSERT(offset == (val & (INTREMAP_ENTRIES - 1))); - val &= ~(INTREMAP_ENTRIES - 1); + ASSERT(offset == (val & (INTREMAP_MAX_ENTRIES - 1))); + val &= ~(INTREMAP_MAX_ENTRIES - 1); /* The IntType fields match for both formats. */ val |= MASK_INSR(entry.ptr32->flds.int_type, IO_APIC_REDIR_DELIV_MODE_MASK); @@ -622,11 +638,11 @@ static int update_intremap_entry_from_ms dest = MASK_EXTR(msg->address_lo, MSI_ADDR_DEST_ID_MASK); offset = *remap_index; - if ( offset >= INTREMAP_ENTRIES ) + if ( offset >= INTREMAP_MAX_ENTRIES ) { ASSERT(nr); - offset = alloc_intremap_entry(iommu->seg, bdf, nr); - if ( offset >= INTREMAP_ENTRIES ) + offset = alloc_intremap_entry(iommu, bdf, nr); + if ( offset >= INTREMAP_MAX_ENTRIES ) { spin_unlock_irqrestore(lock, flags); return -ENOSPC; @@ -654,7 +670,7 @@ static int update_intremap_entry_from_ms update_intremap_entry(iommu, entry, vector, delivery_mode, dest_mode, dest); spin_unlock_irqrestore(lock, flags); - *data = (msg->data & ~(INTREMAP_ENTRIES - 1)) | offset; + *data = (msg->data & ~(INTREMAP_MAX_ENTRIES - 1)) | offset; /* * In some special cases, a pci-e device(e.g SATA controller in IDE mode) @@ -738,7 +754,7 @@ int amd_iommu_msi_msg_update_ire( void amd_iommu_read_msi_from_ire( struct msi_desc *msi_desc, struct msi_msg *msg) { - unsigned int offset = msg->data & (INTREMAP_ENTRIES - 1); + unsigned int offset = msg->data & (INTREMAP_MAX_ENTRIES - 1); const struct pci_dev *pdev = msi_desc->dev; u16 bdf = pdev ? PCI_BDF2(pdev->bus, pdev->devfn) : hpet_sbdf.bdf; u16 seg = pdev ? pdev->seg : hpet_sbdf.seg; @@ -758,7 +774,7 @@ void amd_iommu_read_msi_from_ire( offset |= nr; } - msg->data &= ~(INTREMAP_ENTRIES - 1); + msg->data &= ~(INTREMAP_MAX_ENTRIES - 1); /* The IntType fields match for both formats. */ msg->data |= MASK_INSR(entry.ptr32->flds.int_type, MSI_DATA_DELIVERY_MODE_MASK); @@ -824,8 +840,9 @@ void *amd_iommu_alloc_intremap_table( if ( tb ) { - *inuse_map = xzalloc_array(unsigned long, - BITS_TO_LONGS(INTREMAP_ENTRIES)); + unsigned int nr = intremap_table_entries(tb, iommu); + + *inuse_map = xzalloc_array(unsigned long, BITS_TO_LONGS(nr)); if ( *inuse_map ) memset(tb, 0, PAGE_SIZE << order); else @@ -869,6 +886,7 @@ bool __init iov_supports_xt(void) int __init amd_setup_hpet_msi(struct msi_desc *msi_desc) { + const struct amd_iommu *iommu; spinlock_t *lock; unsigned long flags; int rc = 0; @@ -886,12 +904,15 @@ int __init amd_setup_hpet_msi(struct msi return -ENODEV; } + iommu = find_iommu_for_device(hpet_sbdf.seg, hpet_sbdf.bdf); + if ( !iommu ) + return -ENXIO; + lock = get_intremap_lock(hpet_sbdf.seg, hpet_sbdf.bdf); spin_lock_irqsave(lock, flags); - msi_desc->remap_index = alloc_intremap_entry(hpet_sbdf.seg, - hpet_sbdf.bdf, 1); - if ( msi_desc->remap_index >= INTREMAP_ENTRIES ) + msi_desc->remap_index = alloc_intremap_entry(iommu, hpet_sbdf.bdf, 1); + if ( msi_desc->remap_index >= INTREMAP_MAX_ENTRIES ) { msi_desc->remap_index = -1; rc = -ENXIO; @@ -906,12 +927,14 @@ static void dump_intremap_table(const st union irte_cptr tbl, const struct ivrs_mappings *ivrs_mapping) { - unsigned int count; + unsigned int count, nr; if ( !tbl.ptr ) return; - for ( count = 0; count < INTREMAP_ENTRIES; count++ ) + nr = intremap_table_entries(tbl.ptr, iommu); + + for ( count = 0; count < nr; count++ ) { if ( iommu->ctrl.ga_en ? !tbl.ptr128[count].raw[0] && !tbl.ptr128[count].raw[1] --- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h +++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h @@ -113,6 +113,8 @@ void *amd_iommu_alloc_intremap_table( const struct amd_iommu *, unsigned long **); int amd_iommu_free_intremap_table( const struct amd_iommu *, struct ivrs_mappings *, uint16_t); +unsigned int amd_iommu_intremap_table_order( + const void *irt, const struct amd_iommu *iommu); void amd_iommu_ioapic_update_ire( unsigned int apic, unsigned int reg, unsigned int value); unsigned int amd_iommu_read_ioapic_from_ire(
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