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xen-devel
[Xen-devel] Re: [PATCH RFC V2 5/5] kvm guest : pv-ticketlocks support fo
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To: |
Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH RFC V2 5/5] kvm guest : pv-ticketlocks support for linux guests running on KVM hypervisor |
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From: |
Sasha Levin <levinsasha928@xxxxxxxxx> |
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Date: |
Mon, 24 Oct 2011 12:01:54 +0200 |
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Cc: |
Tosatti <mtosatti@xxxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Suzuki, Sedat, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, x86@xxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Kivity <avi@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Marcelo, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx>, Wilk <konrad.wilk@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Poulose <suzuki@xxxxxxxxxxxxxxxxxx>, Konrad, Avi |
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Tue, 25 Oct 2011 09:49:05 -0700 |
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On Mon, 2011-10-24 at 00:37 +0530, Raghavendra K T wrote:
> This patch extends Linux guests running on KVM hypervisor to support
> pv-ticketlocks. Very early during bootup, paravirtualied KVM guest detects if
> the hypervisor has required feature (KVM_FEATURE_WAIT_FOR_KICK) to support
> pv-ticketlocks. If so, support for pv-ticketlocks is registered via
> pv_lock_ops.
>
> Signed-off-by: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Suzuki Poulose <suzuki@xxxxxxxxxx>
> Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
> ---
> diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
> index 2874c19..c7f34b7 100644
> --- a/arch/x86/include/asm/kvm_para.h
> +++ b/arch/x86/include/asm/kvm_para.h
> @@ -195,10 +195,18 @@ void kvm_async_pf_task_wait(u32 token);
> void kvm_async_pf_task_wake(u32 token);
> u32 kvm_read_and_reset_pf_reason(void);
> extern void kvm_disable_steal_time(void);
> -#else
> +
> +#ifdef CONFIG_PARAVIRT_SPINLOCKS
> +void __init kvm_guest_early_init(void);
> +#else /* CONFIG_PARAVIRT_SPINLOCKS */
> +#define kvm_guest_early_init() do { } while (0)
This should be defined as an empty function.
--
Sasha.
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