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* KVM: only abort guest entry if timer count goes from 0->1Marcelo Tosatti2008-07-201-7/+4
| | | | | | | | | | | | | | | | Only abort guest entry if the timer count went from 0->1, since for 1->2 or larger the bit will either be set already or a timer irq will have been injected. Using atomic_inc_and_test() for it also introduces an SMP barrier to the LAPIC version (thought it was unecessary because of timer migration, but guest can be scheduled to a different pCPU between exit and kvm_vcpu_block(), so there is the possibility for a race). Noticed by Avi. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: kvm_io_device: extend in_range() to manage len and write attributeLaurent Vivier2008-07-201-2/+4
| | | | | | | | | | Modify member in_range() of structure kvm_io_device to pass length and the type of the I/O (write or read). This modification allows to use kvm_io_device with coalesced MMIO. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: PIT: support mode 3Aurelien Jarno2008-07-201-0/+1
| | | | | | | | | | | | | The in-kernel PIT emulation ignores pending timers if operating under mode 3, which for example Hurd uses. This mode should output a square wave, high for (N+1)/2 counts and low for (N-1)/2 counts. As we only care about the resulting interrupts, the period is N, and mode 3 is the same as mode 2 with regard to interrupts. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: add statics were possible, function definition in lapic.hHarvey Harrison2008-07-201-3/+3
| | | | | | | | | | | | | | | | Noticed by sparse: arch/x86/kvm/vmx.c:1583:6: warning: symbol 'vmx_disable_intercept_for_msr' was not declared. Should it be static? arch/x86/kvm/x86.c:3406:5: warning: symbol 'kvm_task_switch_16' was not declared. Should it be static? arch/x86/kvm/x86.c:3429:5: warning: symbol 'kvm_task_switch_32' was not declared. Should it be static? arch/x86/kvm/mmu.c:1968:6: warning: symbol 'kvm_mmu_remove_one_alloc_mmu_page' was not declared. Should it be static? arch/x86/kvm/mmu.c:2014:6: warning: symbol 'mmu_destroy_caches' was not declared. Should it be static? arch/x86/kvm/lapic.c:862:5: warning: symbol 'kvm_lapic_get_base' was not declared. Should it be static? arch/x86/kvm/i8254.c:94:5: warning: symbol 'pit_get_gate' was not declared. Should it be static? arch/x86/kvm/i8254.c:196:5: warning: symbol '__pit_timer_fn' was not declared. Should it be static? arch/x86/kvm/i8254.c:561:6: warning: symbol '__inject_pit_timer_intr' was not declared. Should it be static? Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: close timer injection race window in __vcpu_runMarcelo Tosatti2008-06-241-3/+6
| | | | | | | | | | | | | | If a timer fires after kvm_inject_pending_timer_irqs() but before local_irq_disable() the code will enter guest mode and only inject such timer interrupt the next time an unrelated event causes an exit. It would be simpler if the timer->pending irq conversion could be done with IRQ's disabled, so that the above problem cannot happen. For now introduce a new vcpu requests bit to cancel guest entry. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: migrate PIT timerMarcelo Tosatti2008-06-061-1/+13
| | | | | | | | | Migrate the PIT timer to the physical CPU which vcpu0 is scheduled on, similarly to what is done for the LAPIC timers, otherwise PIT interrupts will be delayed until an unrelated event causes an exit. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: PIT: take inject_pending into account when emulating hltMarcelo Tosatti2008-05-181-1/+1
| | | | | | | Otherwise hlt emulation fails if PIT is not injecting IRQ's. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: PIT: support mode 4Marcelo Tosatti2008-05-041-0/+2
| | | | | | | | | | | | | | | The in-kernel PIT emulation ignores pending timers if operating under mode 4, which for example DragonFlyBSD uses (and Plan9 too, apparently). Mode 4 seems to be similar to one-shot mode, other than the fact that it starts counting after the next CLK pulse once programmed, while mode 1 starts counting immediately, so add a FIXME to enhance precision. Fixes sourceforge bug 1952988. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* rename div64_64 to div64_u64Roman Zippel2008-05-011-3/+3
| | | | | | | | | | | | | | | | | | | | | Rename div64_64 to div64_u64 to make it consistent with the other divide functions, so it clearly includes the type of the divide. Move its definition to math64.h as currently no architecture overrides the generic implementation. They can still override it of course, but the duplicated declarations are avoided. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Cc: Avi Kivity <avi@qumranet.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* KVM: Rename VCPU_MP_STATE_* to KVM_MP_STATE_*Avi Kivity2008-04-271-1/+1
| | | | | | We wish to export it to userspace, so move it into the kvm namespace. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: hlt emulation should take in-kernel APIC/PIT timers into accountMarcelo Tosatti2008-04-271-0/+10
| | | | | | | | | | | | | | | | | | Timers that fire between guest hlt and vcpu_block's add_wait_queue() are ignored, possibly resulting in hangs. Also make sure that atomic_inc and waitqueue_active tests happen in the specified order, otherwise the following race is open: CPU0 CPU1 if (waitqueue_active(wq)) add_wait_queue() if (!atomic_read(pit_timer->pending)) schedule() atomic_inc(pit_timer->pending) Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Add reset support for in kernel PITSheng Yang2008-04-271-11/+19
| | | | | | | Separate the reset part and prepare for reset support. Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Add save/restore supporting of in kernel PITSheng Yang2008-04-271-0/+7
| | | | | Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: In kernel PIT modelSheng Yang2008-04-271-0/+586
The patch moves the PIT model from userspace to kernel, and increases the timer accuracy greatly. [marcelo: make last_injected_time per-guest] Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Tested-and-Acked-by: Alex Davis <alex14641@yahoo.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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