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xen.23271
5d41785b-AMD-IOMMU-bitfield-IRTE.patch
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File 5d41785b-AMD-IOMMU-bitfield-IRTE.patch of Package xen.23271
References: bsc#1135799 # Commit b75623c5062b741248547862a3e1b7d4b129c128 # Date 2019-07-31 13:15:39 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> AMD/IOMMU: use bit field for IRTE At the same time restrict its scope to just the single source file actually using it, and abstract accesses by introducing a union of pointers. (A union of the actual table entries is not used to make it impossible to [wrongly, once the 128-bit form gets added] perform pointer arithmetic / array accesses on derived types.) Also move away from updating the entries piecemeal: Construct a full new entry, and write it out. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Brian Woods <brian.woods@amd.com> --- a/xen/drivers/passthrough/amd/iommu_intr.c +++ b/xen/drivers/passthrough/amd/iommu_intr.c @@ -24,6 +24,26 @@ #include <xen/keyhandler.h> #include <xen/softirq.h> +union irte32 { + uint32_t raw; + struct { + bool remap_en:1; + bool sup_io_pf:1; + unsigned int int_type:3; + bool rq_eoi:1; + bool dm:1; + bool guest_mode:1; /* MBZ */ + unsigned int dest:8; + unsigned int vector:8; + unsigned int :8; + } flds; +}; + +union irte_ptr { + void *ptr; + union irte32 *ptr32; +}; + #define INTREMAP_TABLE_ORDER 1 #define INTREMAP_LENGTH 0xB #define INTREMAP_ENTRIES (1 << INTREMAP_LENGTH) @@ -102,47 +122,45 @@ static unsigned int alloc_intremap_entry return slot; } -static u32 *get_intremap_entry(int seg, int bdf, int offset) +static union irte_ptr get_intremap_entry(unsigned int seg, unsigned int bdf, + unsigned int index) { - u32 *table = get_ivrs_mappings(seg)[bdf].intremap_table; + union irte_ptr table = { + .ptr = get_ivrs_mappings(seg)[bdf].intremap_table + }; + + ASSERT(table.ptr && (index < INTREMAP_ENTRIES)); - ASSERT( (table != NULL) && (offset < INTREMAP_ENTRIES) ); + table.ptr32 += index; - return table + offset; + return table; } -static void free_intremap_entry(int seg, int bdf, int offset) -{ - u32 *entry = get_intremap_entry(seg, bdf, offset); - - memset(entry, 0, sizeof(u32)); - __clear_bit(offset, get_ivrs_mappings(seg)[bdf].intremap_inuse); -} - -static void update_intremap_entry(u32* entry, u8 vector, u8 int_type, - u8 dest_mode, u8 dest) -{ - set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, 0, - INT_REMAP_ENTRY_REMAPEN_MASK, - INT_REMAP_ENTRY_REMAPEN_SHIFT, entry); - set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, *entry, - INT_REMAP_ENTRY_SUPIOPF_MASK, - INT_REMAP_ENTRY_SUPIOPF_SHIFT, entry); - set_field_in_reg_u32(int_type, *entry, - INT_REMAP_ENTRY_INTTYPE_MASK, - INT_REMAP_ENTRY_INTTYPE_SHIFT, entry); - set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, *entry, - INT_REMAP_ENTRY_REQEOI_MASK, - INT_REMAP_ENTRY_REQEOI_SHIFT, entry); - set_field_in_reg_u32((u32)dest_mode, *entry, - INT_REMAP_ENTRY_DM_MASK, - INT_REMAP_ENTRY_DM_SHIFT, entry); - set_field_in_reg_u32((u32)dest, *entry, - INT_REMAP_ENTRY_DEST_MAST, - INT_REMAP_ENTRY_DEST_SHIFT, entry); - set_field_in_reg_u32((u32)vector, *entry, - INT_REMAP_ENTRY_VECTOR_MASK, - INT_REMAP_ENTRY_VECTOR_SHIFT, entry); +static void free_intremap_entry(unsigned int seg, unsigned int bdf, + unsigned int index) +{ + union irte_ptr entry = get_intremap_entry(seg, bdf, index); + + ACCESS_ONCE(entry.ptr32->raw) = 0; + + __clear_bit(index, get_ivrs_mappings(seg)[bdf].intremap_inuse); +} + +static void update_intremap_entry(union irte_ptr entry, unsigned int vector, + unsigned int int_type, + unsigned int dest_mode, unsigned int dest) +{ + union irte32 irte = { + .flds = { + .remap_en = true, + .int_type = int_type, + .dm = dest_mode, + .dest = dest, + .vector = vector, + }, + }; + + ACCESS_ONCE(entry.ptr32->raw) = irte.raw; } static inline int get_rte_index(const struct IO_APIC_route_entry *rte) @@ -164,7 +182,7 @@ static int update_intremap_entry_from_io u16 *index) { unsigned long flags; - u32* entry; + union irte_ptr entry; u8 delivery_mode, dest, vector, dest_mode; int req_id; spinlock_t *lock; @@ -202,12 +220,8 @@ static int update_intremap_entry_from_io * so need to recover vector and delivery mode from IRTE. */ ASSERT(get_rte_index(rte) == offset); - vector = get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_VECTOR_MASK, - INT_REMAP_ENTRY_VECTOR_SHIFT); - delivery_mode = get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_INTTYPE_MASK, - INT_REMAP_ENTRY_INTTYPE_SHIFT); + vector = entry.ptr32->flds.vector; + delivery_mode = entry.ptr32->flds.int_type; } update_intremap_entry(entry, vector, delivery_mode, dest_mode, dest); @@ -229,7 +243,7 @@ int __init amd_iommu_setup_ioapic_remapp { struct IO_APIC_route_entry rte; unsigned long flags; - u32* entry; + union irte_ptr entry; int apic, pin; u8 delivery_mode, dest, vector, dest_mode; u16 seg, bdf, req_id; @@ -408,16 +422,14 @@ unsigned int amd_iommu_read_ioapic_from_ u16 bdf = ioapic_sbdf[idx].bdf; u16 seg = ioapic_sbdf[idx].seg; u16 req_id = get_intremap_requestor_id(seg, bdf); - const u32 *entry = get_intremap_entry(seg, req_id, offset); + union irte_ptr entry = get_intremap_entry(seg, req_id, offset); ASSERT(offset == (val & (INTREMAP_ENTRIES - 1))); val &= ~(INTREMAP_ENTRIES - 1); - val |= get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_INTTYPE_MASK, - INT_REMAP_ENTRY_INTTYPE_SHIFT) << 8; - val |= get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_VECTOR_MASK, - INT_REMAP_ENTRY_VECTOR_SHIFT); + val |= MASK_INSR(entry.ptr32->flds.int_type, + IO_APIC_REDIR_DELIV_MODE_MASK); + val |= MASK_INSR(entry.ptr32->flds.vector, + IO_APIC_REDIR_VECTOR_MASK); } return val; @@ -428,7 +440,7 @@ static int update_intremap_entry_from_ms int *remap_index, const struct msi_msg *msg, u32 *data) { unsigned long flags; - u32* entry; + union irte_ptr entry; u16 req_id, alias_id; u8 delivery_mode, dest, vector, dest_mode; spinlock_t *lock; @@ -582,7 +594,7 @@ void amd_iommu_read_msi_from_ire( 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; - const u32 *entry; + union irte_ptr entry; if ( IS_ERR_OR_NULL(_find_iommu_for_device(seg, bdf)) ) return; @@ -598,12 +610,10 @@ void amd_iommu_read_msi_from_ire( } msg->data &= ~(INTREMAP_ENTRIES - 1); - msg->data |= get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_INTTYPE_MASK, - INT_REMAP_ENTRY_INTTYPE_SHIFT) << 8; - msg->data |= get_field_from_reg_u32(*entry, - INT_REMAP_ENTRY_VECTOR_MASK, - INT_REMAP_ENTRY_VECTOR_SHIFT); + msg->data |= MASK_INSR(entry.ptr32->flds.int_type, + MSI_DATA_DELIVERY_MODE_MASK); + msg->data |= MASK_INSR(entry.ptr32->flds.vector, + MSI_DATA_VECTOR_MASK); } int __init amd_iommu_free_intremap_table( --- a/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h +++ b/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h @@ -499,22 +499,6 @@ union amd_iommu_ext_features { #define IOMMU_CONTROL_DISABLED 0 #define IOMMU_CONTROL_ENABLED 1 -/* interrupt remapping table */ -#define INT_REMAP_ENTRY_REMAPEN_MASK 0x00000001 -#define INT_REMAP_ENTRY_REMAPEN_SHIFT 0 -#define INT_REMAP_ENTRY_SUPIOPF_MASK 0x00000002 -#define INT_REMAP_ENTRY_SUPIOPF_SHIFT 1 -#define INT_REMAP_ENTRY_INTTYPE_MASK 0x0000001C -#define INT_REMAP_ENTRY_INTTYPE_SHIFT 2 -#define INT_REMAP_ENTRY_REQEOI_MASK 0x00000020 -#define INT_REMAP_ENTRY_REQEOI_SHIFT 5 -#define INT_REMAP_ENTRY_DM_MASK 0x00000040 -#define INT_REMAP_ENTRY_DM_SHIFT 6 -#define INT_REMAP_ENTRY_DEST_MAST 0x0000FF00 -#define INT_REMAP_ENTRY_DEST_SHIFT 8 -#define INT_REMAP_ENTRY_VECTOR_MASK 0x00FF0000 -#define INT_REMAP_ENTRY_VECTOR_SHIFT 16 - #define INV_IOMMU_ALL_PAGES_ADDRESS ((1ULL << 63) - 1) #define IOMMU_RING_BUFFER_PTR_MASK 0x0007FFF0 --- a/xen/include/asm-x86/io_apic.h +++ b/xen/include/asm-x86/io_apic.h @@ -21,6 +21,7 @@ /* I/O Unit Redirection Table */ #define IO_APIC_REDIR_VECTOR_MASK 0x000FF +#define IO_APIC_REDIR_DELIV_MODE_MASK 0x00700 #define IO_APIC_REDIR_DEST_LOGICAL 0x00800 #define IO_APIC_REDIR_DEST_PHYSICAL 0x00000 #define IO_APIC_REDIR_SEND_PENDING (1 << 12)
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