linux-kernel - Re: [PATCH] tile: support KVM for tilegx

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Date:	Mon, 12 Aug 2013 19:08:18 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Chris Metcalf <cmetcalf@...era.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Gleb Natapov <gleb@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] tile: support KVM for tilegx

On 2013-08-12 17:24, Chris Metcalf wrote:
> This change provides the initial framework support for KVM on tilegx.
> Basic virtual disk and networking is supported.
> 
> Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
> ---

...

> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index acccd08..d3879c5 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -171,6 +171,7 @@ struct kvm_pit_config {
>  #define KVM_EXIT_WATCHDOG         21
>  #define KVM_EXIT_S390_TSCH        22
>  #define KVM_EXIT_EPR              23
> +#define KVM_EXIT_AGAIN            24
>  
>  /* For KVM_EXIT_INTERNAL_ERROR */
>  /* Emulate instruction failed. */
> @@ -1012,6 +1013,8 @@ struct kvm_s390_ucas_mapping {
>  #define KVM_KVMCLOCK_CTRL	  _IO(KVMIO,   0xad)
>  #define KVM_ARM_VCPU_INIT	  _IOW(KVMIO,  0xae, struct kvm_vcpu_init)
>  #define KVM_GET_REG_LIST	  _IOWR(KVMIO, 0xb0, struct kvm_reg_list)
> +/* Reset some SPR registers for tilegx */
> +#define KVM_TILE_RESET_SPR	  _IO(KVMIO,  0xa8)

The KVM way of doing this is typically GET/SET_SPR, i.e. a way to
read/write the registers from userspace. This will be required for
migration support anyway, I bet.

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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