diff options
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 15 | ||||
| -rw-r--r-- | arch/x86/xen/irq.c | 25 | ||||
| -rw-r--r-- | arch/x86/xen/p2m.c | 22 | ||||
| -rw-r--r-- | arch/x86/xen/setup.c | 29 | ||||
| -rw-r--r-- | arch/x86/xen/smp.c | 6 |
5 files changed, 65 insertions, 32 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 2fcaedc0b739..2fc216dfbd9c 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -427,8 +427,7 @@ static void __init xen_init_cpuid_mask(void) if (!xen_initial_domain()) cpuid_leaf1_edx_mask &= - ~((1 << X86_FEATURE_APIC) | /* disable local APIC */ - (1 << X86_FEATURE_ACPI)); /* disable ACPI */ + ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */ cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32)); @@ -735,8 +734,7 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val, addr = (unsigned long)xen_int3; else if (addr == (unsigned long)stack_segment) addr = (unsigned long)xen_stack_segment; - else if (addr == (unsigned long)double_fault || - addr == (unsigned long)nmi) { + else if (addr == (unsigned long)double_fault) { /* Don't need to handle these */ return 0; #ifdef CONFIG_X86_MCE @@ -747,7 +745,12 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val, */ ; #endif - } else { + } else if (addr == (unsigned long)nmi) + /* + * Use the native version as well. + */ + ; + else { /* Some other trap using IST? */ if (WARN_ON(val->ist != 0)) return 0; @@ -1710,6 +1713,8 @@ static void __init xen_hvm_guest_init(void) xen_hvm_init_shared_info(); + xen_panic_handler_init(); + if (xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback = 1; xen_hvm_smp_init(); diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c index 01a4dc015ae1..0da7f863056f 100644 --- a/arch/x86/xen/irq.c +++ b/arch/x86/xen/irq.c @@ -47,23 +47,18 @@ static void xen_restore_fl(unsigned long flags) /* convert from IF type flag */ flags = !(flags & X86_EFLAGS_IF); - /* There's a one instruction preempt window here. We need to - make sure we're don't switch CPUs between getting the vcpu - pointer and updating the mask. */ + /* See xen_irq_enable() for why preemption must be disabled. */ preempt_disable(); vcpu = this_cpu_read(xen_vcpu); vcpu->evtchn_upcall_mask = flags; - preempt_enable_no_resched(); - - /* Doesn't matter if we get preempted here, because any - pending event will get dealt with anyway. */ if (flags == 0) { - preempt_check_resched(); barrier(); /* unmask then check (avoid races) */ if (unlikely(vcpu->evtchn_upcall_pending)) xen_force_evtchn_callback(); - } + preempt_enable(); + } else + preempt_enable_no_resched(); } PV_CALLEE_SAVE_REGS_THUNK(xen_restore_fl); @@ -82,10 +77,12 @@ static void xen_irq_enable(void) { struct vcpu_info *vcpu; - /* We don't need to worry about being preempted here, since - either a) interrupts are disabled, so no preemption, or b) - the caller is confused and is trying to re-enable interrupts - on an indeterminate processor. */ + /* + * We may be preempted as soon as vcpu->evtchn_upcall_mask is + * cleared, so disable preemption to ensure we check for + * events on the VCPU we are still running on. + */ + preempt_disable(); vcpu = this_cpu_read(xen_vcpu); vcpu->evtchn_upcall_mask = 0; @@ -96,6 +93,8 @@ static void xen_irq_enable(void) barrier(); /* unmask then check (avoid races) */ if (unlikely(vcpu->evtchn_upcall_pending)) xen_force_evtchn_callback(); + + preempt_enable(); } PV_CALLEE_SAVE_REGS_THUNK(xen_irq_enable); diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 95fb2aa5927e..0d4ec35895d4 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -161,6 +161,7 @@ #include <asm/xen/page.h> #include <asm/xen/hypercall.h> #include <asm/xen/hypervisor.h> +#include <xen/balloon.h> #include <xen/grant_table.h> #include "multicalls.h" @@ -967,7 +968,10 @@ int m2p_remove_override(struct page *page, if (kmap_op != NULL) { if (!PageHighMem(page)) { struct multicall_space mcs; - struct gnttab_unmap_grant_ref *unmap_op; + struct gnttab_unmap_and_replace *unmap_op; + struct page *scratch_page = get_balloon_scratch_page(); + unsigned long scratch_page_address = (unsigned long) + __va(page_to_pfn(scratch_page) << PAGE_SHIFT); /* * It might be that we queued all the m2p grant table @@ -990,21 +994,25 @@ int m2p_remove_override(struct page *page, } mcs = xen_mc_entry( - sizeof(struct gnttab_unmap_grant_ref)); + sizeof(struct gnttab_unmap_and_replace)); unmap_op = mcs.args; unmap_op->host_addr = kmap_op->host_addr; + unmap_op->new_addr = scratch_page_address; unmap_op->handle = kmap_op->handle; - unmap_op->dev_bus_addr = 0; MULTI_grant_table_op(mcs.mc, - GNTTABOP_unmap_grant_ref, unmap_op, 1); + GNTTABOP_unmap_and_replace, unmap_op, 1); xen_mc_issue(PARAVIRT_LAZY_MMU); - set_pte_at(&init_mm, address, ptep, - pfn_pte(pfn, PAGE_KERNEL)); - __flush_tlb_single(address); + mcs = __xen_mc_entry(0); + MULTI_update_va_mapping(mcs.mc, scratch_page_address, + pfn_pte(page_to_pfn(get_balloon_scratch_page()), + PAGE_KERNEL_RO), 0); + xen_mc_issue(PARAVIRT_LAZY_MMU); + kmap_op->host_addr = 0; + put_balloon_scratch_page(); } } diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 8f3eea6b80c5..09f3059cb00b 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -33,6 +33,9 @@ /* These are code, but not functions. Defined in entry.S */ extern const char xen_hypervisor_callback[]; extern const char xen_failsafe_callback[]; +#ifdef CONFIG_X86_64 +extern const char nmi[]; +#endif extern void xen_sysenter_target(void); extern void xen_syscall_target(void); extern void xen_syscall32_target(void); @@ -215,13 +218,19 @@ static void __init xen_set_identity_and_release_chunk( unsigned long pfn; /* - * If the PFNs are currently mapped, the VA mapping also needs - * to be updated to be 1:1. + * If the PFNs are currently mapped, clear the mappings + * (except for the ISA region which must be 1:1 mapped) to + * release the refcounts (in Xen) on the original frames. */ - for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++) + for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++) { + pte_t pte = __pte_ma(0); + + if (pfn < PFN_UP(ISA_END_ADDRESS)) + pte = mfn_pte(pfn, PAGE_KERNEL_IO); + (void)HYPERVISOR_update_va_mapping( - (unsigned long)__va(pfn << PAGE_SHIFT), - mfn_pte(pfn, PAGE_KERNEL_IO), 0); + (unsigned long)__va(pfn << PAGE_SHIFT), pte, 0); + } if (start_pfn < nr_pages) *released += xen_release_chunk( @@ -547,7 +556,13 @@ void xen_enable_syscall(void) } #endif /* CONFIG_X86_64 */ } - +void __cpuinit xen_enable_nmi(void) +{ +#ifdef CONFIG_X86_64 + if (register_callback(CALLBACKTYPE_nmi, nmi)) + BUG(); +#endif +} void __init xen_arch_setup(void) { xen_panic_handler_init(); @@ -565,7 +580,7 @@ void __init xen_arch_setup(void) xen_enable_sysenter(); xen_enable_syscall(); - + xen_enable_nmi(); #ifdef CONFIG_ACPI if (!(xen_start_info->flags & SIF_INITDOMAIN)) { printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 597655bd72b0..9235842cd76a 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -573,6 +573,12 @@ static inline int xen_map_vector(int vector) case IRQ_WORK_VECTOR: xen_vector = XEN_IRQ_WORK_VECTOR; break; +#ifdef CONFIG_X86_64 + case NMI_VECTOR: + case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */ + xen_vector = XEN_NMI_VECTOR; + break; +#endif default: xen_vector = -1; printk(KERN_ERR "xen: vector 0x%x is not implemented\n", |