From 497c9a195db918d3f035e8cb3021e5d4d035516e Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Tue, 19 Aug 2008 20:50:28 -0700 Subject: x86: make 32bit support per_cpu vector so we can merge io_apic_32.c and io_apic_64.c v2: Use cpu_online_map as target cpus for bigsmp, just like 64-bit is doing. Also remove some unused TARGET_CPUS macro. v3: need to check if desc is null in smp_irq_move_cleanup also migration needs to reset vector too, so copy __target_IO_APIC_irq from 64bit. (the duplication will go away once the two files are unified.) Signed-off-by: Yinghai Lu Signed-off-by: Ingo Molnar --- arch/x86/lguest/boot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/lguest/boot.c') diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 65f0b8a47be..48ee4f9435f 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -582,7 +582,7 @@ static void __init lguest_init_IRQ(void) for (i = 0; i < LGUEST_IRQS; i++) { int vector = FIRST_EXTERNAL_VECTOR + i; if (vector != SYSCALL_VECTOR) { - set_intr_gate(vector, interrupt[i]); + set_intr_gate(vector, interrupt[vector]); set_irq_chip_and_handler_name(i, &lguest_irq_controller, handle_level_irq, "level"); -- cgit v1.2.3-70-g09d2 From ad5173ff8a387191dbacf889becb92c59aba5d59 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Fri, 31 Oct 2008 11:24:27 -0500 Subject: lguest: fix early_ioremap. dmi_scan_machine breaks under lguest: lguest: unhandled trap 14 at 0xc04edeae (0xffa00000) This is because we use current_cr3 for the read_cr3() paravirt function, and it isn't set until the first cr3 change. We got away with it until this happened. Signed-off-by: Rusty Russell --- arch/x86/lguest/boot.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) (limited to 'arch/x86/lguest/boot.c') diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 48ee4f9435f..4e22fa08d62 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -367,10 +367,9 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx, * lazily after a task switch, and Linux uses that gratefully, but wouldn't a * name like "FPUTRAP bit" be a little less cryptic? * - * We store cr0 (and cr3) locally, because the Host never changes it. The - * Guest sometimes wants to read it and we'd prefer not to bother the Host - * unnecessarily. */ -static unsigned long current_cr0, current_cr3; + * We store cr0 locally because the Host never changes it. The Guest sometimes + * wants to read it and we'd prefer not to bother the Host unnecessarily. */ +static unsigned long current_cr0; static void lguest_write_cr0(unsigned long val) { lazy_hcall(LHCALL_TS, val & X86_CR0_TS, 0, 0); @@ -399,17 +398,23 @@ static unsigned long lguest_read_cr2(void) return lguest_data.cr2; } +/* See lguest_set_pte() below. */ +static bool cr3_changed = false; + /* cr3 is the current toplevel pagetable page: the principle is the same as - * cr0. Keep a local copy, and tell the Host when it changes. */ + * cr0. Keep a local copy, and tell the Host when it changes. The only + * difference is that our local copy is in lguest_data because the Host needs + * to set it upon our initial hypercall. */ static void lguest_write_cr3(unsigned long cr3) { + lguest_data.pgdir = cr3; lazy_hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0); - current_cr3 = cr3; + cr3_changed = true; } static unsigned long lguest_read_cr3(void) { - return current_cr3; + return lguest_data.pgdir; } /* cr4 is used to enable and disable PGE, but we don't care. */ @@ -498,13 +503,13 @@ static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval) * to forget all of them. Fortunately, this is very rare. * * ... except in early boot when the kernel sets up the initial pagetables, - * which makes booting astonishingly slow. So we don't even tell the Host - * anything changed until we've done the first page table switch. */ + * which makes booting astonishingly slow: 1.83 seconds! So we don't even tell + * the Host anything changed until we've done the first page table switch, + * which brings boot back to 0.25 seconds. */ static void lguest_set_pte(pte_t *ptep, pte_t pteval) { *ptep = pteval; - /* Don't bother with hypercall before initial setup. */ - if (current_cr3) + if (cr3_changed) lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0); } @@ -521,7 +526,7 @@ static void lguest_set_pte(pte_t *ptep, pte_t pteval) static void lguest_flush_tlb_single(unsigned long addr) { /* Simply set it to zero: if it was not, it will fault back in. */ - lazy_hcall(LHCALL_SET_PTE, current_cr3, addr, 0); + lazy_hcall(LHCALL_SET_PTE, lguest_data.pgdir, addr, 0); } /* This is what happens after the Guest has removed a large number of entries. -- cgit v1.2.3-70-g09d2 From 526e5ab200ce483dcdf146806f4936bd58daa800 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Fri, 31 Oct 2008 11:24:27 -0500 Subject: lguest: fix irq vectors. do_IRQ: cannot handle IRQ -1 vector 0x20 cpu 0 ------------[ cut here ]------------ kernel BUG at arch/x86/kernel/irq_32.c:219! We're not ISA: we have a 1:1 mapping from vectors to irqs. Signed-off-by: Rusty Russell --- arch/x86/lguest/boot.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/lguest/boot.c') diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 4e22fa08d62..a5d8e1ace1c 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -586,6 +586,9 @@ static void __init lguest_init_IRQ(void) for (i = 0; i < LGUEST_IRQS; i++) { int vector = FIRST_EXTERNAL_VECTOR + i; + /* Some systems map "vectors" to interrupts weirdly. Lguest has + * a straightforward 1 to 1 mapping, so force that here. */ + __get_cpu_var(vector_irq)[vector] = i; if (vector != SYSCALL_VECTOR) { set_intr_gate(vector, interrupt[vector]); set_irq_chip_and_handler_name(i, &lguest_irq_controller, -- cgit v1.2.3-70-g09d2 From 4687518c4cb7807fbeff21770e309080f9eb7f2f Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Tue, 11 Nov 2008 13:03:07 -0800 Subject: x86: 32 bit: interrupt stub consistency with 64 bit Don't generate interrupt stubs for interrupt vectors below FIRST_EXTERNAL_VECTOR, and make the table of interrupt vectors (interrupt[]) __initconst. Both of these changes both conserve memory and improve consistency with 64 bits. Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/hw_irq.h | 2 +- arch/x86/kernel/entry_32.S | 6 +++--- arch/x86/kernel/irqinit_32.c | 2 +- arch/x86/lguest/boot.c | 3 ++- 4 files changed, 7 insertions(+), 6 deletions(-) (limited to 'arch/x86/lguest/boot.c') diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h index b97aecb0b61..27d33f92afe 100644 --- a/arch/x86/include/asm/hw_irq.h +++ b/arch/x86/include/asm/hw_irq.h @@ -110,7 +110,7 @@ extern asmlinkage void smp_invalidate_interrupt(struct pt_regs *); #endif #ifdef CONFIG_X86_32 -extern void (*const interrupt[NR_VECTORS])(void); +extern void (*__initconst interrupt[NR_VECTORS-FIRST_EXTERNAL_VECTOR])(void); #endif typedef int vector_irq_t[NR_VECTORS]; diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 28b597ef9ca..4aea95652cf 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -622,16 +622,16 @@ END(syscall_badsys) * Build the entry stubs and pointer table with * some assembler magic. */ -.section .rodata,"a" +.section .init.rodata,"a" ENTRY(interrupt) .text ENTRY(irq_entries_start) RING0_INT_FRAME -vector=0 +vector=FIRST_EXTERNAL_VECTOR .rept NR_VECTORS ALIGN - .if vector + .if vector != FIRST_EXTERNAL_VECTOR CFI_ADJUST_CFA_OFFSET -4 .endif 1: pushl $~(vector) diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c index 845aa9803e8..607db63044a 100644 --- a/arch/x86/kernel/irqinit_32.c +++ b/arch/x86/kernel/irqinit_32.c @@ -129,7 +129,7 @@ void __init native_init_IRQ(void) for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) { /* SYSCALL_VECTOR was reserved in trap_init. */ if (i != SYSCALL_VECTOR) - set_intr_gate(i, interrupt[i]); + set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]); } diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index a5d8e1ace1c..50a779264bb 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -590,7 +590,8 @@ static void __init lguest_init_IRQ(void) * a straightforward 1 to 1 mapping, so force that here. */ __get_cpu_var(vector_irq)[vector] = i; if (vector != SYSCALL_VECTOR) { - set_intr_gate(vector, interrupt[vector]); + set_intr_gate(vector, + interrupt[vector-FIRST_EXTERNAL_VECTOR]); set_irq_chip_and_handler_name(i, &lguest_irq_controller, handle_level_irq, "level"); -- cgit v1.2.3-70-g09d2