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Date:   Thu, 9 Nov 2017 09:57:06 -0800
From:   Xavier Deguillard <xdeguillard@vmware.com>
To:     Juergen Gross <jgross@suse.com>
CC:     <linux-kernel@vger.kernel.org>, <tglx@linutronix.de>,
        <mingo@redhat.com>, <hpa@zytor.com>, <x86@kernel.org>,
        <kys@microsoft.com>, <haiyangz@microsoft.com>,
        <sthemmin@microsoft.com>, <akataria@vmware.com>,
        <pbonzini@redhat.com>, <rkrcmar@redhat.com>,
        <boris.ostrovsky@oracle.com>, <devel@linuxdriverproject.org>,
        <virtualization@lists.linux-foundation.org>, <kvm@vger.kernel.org>,
        <xen-devel@lists.xenproject.org>,
        <linux-graphics-maintainer@vmware.com>, <pv-drivers@vmware.com>,
        <dmitry.torokhov@gmail.com>, <arnd@arndb.de>,
        <gregkh@linuxfoundation.org>, <linux-input@vger.kernel.org>
Subject: Re: [PATCH v2 2/5] x86: add enum for hypervisors to replace x86_hyper
Message-ID: <20171109175555.GZ23410@xdeguillard-ws>
References: <20171109132739.23465-1-jgross@suse.com>
 <20171109132739.23465-3-jgross@suse.com>
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Hello Juergen,

The changes to vmw_balloon.c looks good.

Acked-by: Xavier Deguillard <xdeguillard@vmware.com>

Xavier

On Thu, Nov 09, 2017 at 02:27:36PM +0100, Juergen Gross wrote:
> The x86_hyper pointer is only used for checking whether a virtual
> device is supporting the hypervisor the system is running on.
> 
> Use an enum for that purpose instead and drop the x86_hyper pointer.
> 
> Cc: kys@microsoft.com
> Cc: haiyangz@microsoft.com
> Cc: sthemmin@microsoft.com
> Cc: akataria@vmware.com
> Cc: pbonzini@redhat.com
> Cc: rkrcmar@redhat.com
> Cc: boris.ostrovsky@oracle.com
> Cc: devel@linuxdriverproject.org
> Cc: virtualization@lists.linux-foundation.org
> Cc: kvm@vger.kernel.org
> Cc: xen-devel@lists.xenproject.org
> Cc: linux-graphics-maintainer@vmware.com
> Cc: pv-drivers@vmware.com
> Cc: dmitry.torokhov@gmail.com
> Cc: xdeguillard@vmware.com
> Cc: moltmann@vmware.com
> Cc: arnd@arndb.de
> Cc: gregkh@linuxfoundation.org
> Cc: linux-input@vger.kernel.org
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
>  arch/x86/hyperv/hv_init.c         |  2 +-
>  arch/x86/include/asm/hypervisor.h | 23 ++++++++++++++---------
>  arch/x86/kernel/cpu/hypervisor.c  | 12 +++++++++---
>  arch/x86/kernel/cpu/mshyperv.c    |  4 ++--
>  arch/x86/kernel/cpu/vmware.c      |  4 ++--
>  arch/x86/kernel/kvm.c             |  4 ++--
>  arch/x86/xen/enlighten_hvm.c      |  4 ++--
>  arch/x86/xen/enlighten_pv.c       |  4 ++--
>  drivers/hv/vmbus_drv.c            |  2 +-
>  drivers/input/mouse/vmmouse.c     | 10 ++++------
>  drivers/misc/vmw_balloon.c        |  2 +-
>  11 files changed, 40 insertions(+), 31 deletions(-)
> 
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index a5db63f728a2..a0b86cf486e0 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -113,7 +113,7 @@ void hyperv_init(void)
>  	u64 guest_id;
>  	union hv_x64_msr_hypercall_contents hypercall_msr;
>  
> -	if (x86_hyper != &x86_hyper_ms_hyperv)
> +	if (x86_hyper_type != X86_HYPER_MS_HYPERV)
>  		return;
>  
>  	/* Allocate percpu VP index */
> diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
> index 0eca7239a7aa..1b0a5abcd8ae 100644
> --- a/arch/x86/include/asm/hypervisor.h
> +++ b/arch/x86/include/asm/hypervisor.h
> @@ -29,6 +29,16 @@
>  /*
>   * x86 hypervisor information
>   */
> +
> +enum x86_hypervisor_type {
> +	X86_HYPER_NATIVE = 0,
> +	X86_HYPER_VMWARE,
> +	X86_HYPER_MS_HYPERV,
> +	X86_HYPER_XEN_PV,
> +	X86_HYPER_XEN_HVM,
> +	X86_HYPER_KVM,
> +};
> +
>  struct hypervisor_x86 {
>  	/* Hypervisor name */
>  	const char	*name;
> @@ -36,6 +46,9 @@ struct hypervisor_x86 {
>  	/* Detection routine */
>  	uint32_t	(*detect)(void);
>  
> +	/* Hypervisor type */
> +	enum x86_hypervisor_type type;
> +
>  	/* init time callbacks */
>  	struct x86_hyper_init init;
>  
> @@ -43,15 +56,7 @@ struct hypervisor_x86 {
>  	struct x86_hyper_runtime runtime;
>  };
>  
> -extern const struct hypervisor_x86 *x86_hyper;
> -
> -/* Recognized hypervisors */
> -extern const struct hypervisor_x86 x86_hyper_vmware;
> -extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
> -extern const struct hypervisor_x86 x86_hyper_xen_pv;
> -extern const struct hypervisor_x86 x86_hyper_xen_hvm;
> -extern const struct hypervisor_x86 x86_hyper_kvm;
> -
> +extern enum x86_hypervisor_type x86_hyper_type;
>  extern void init_hypervisor_platform(void);
>  #else
>  static inline void init_hypervisor_platform(void) { }
> diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
> index 22226c1bf092..bea8d3e24f50 100644
> --- a/arch/x86/kernel/cpu/hypervisor.c
> +++ b/arch/x86/kernel/cpu/hypervisor.c
> @@ -26,6 +26,12 @@
>  #include <asm/processor.h>
>  #include <asm/hypervisor.h>
>  
> +extern const struct hypervisor_x86 x86_hyper_vmware;
> +extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
> +extern const struct hypervisor_x86 x86_hyper_xen_pv;
> +extern const struct hypervisor_x86 x86_hyper_xen_hvm;
> +extern const struct hypervisor_x86 x86_hyper_kvm;
> +
>  static const __initconst struct hypervisor_x86 * const hypervisors[] =
>  {
>  #ifdef CONFIG_XEN_PV
> @@ -41,8 +47,8 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
>  #endif
>  };
>  
> -const struct hypervisor_x86 *x86_hyper;
> -EXPORT_SYMBOL(x86_hyper);
> +enum x86_hypervisor_type x86_hyper_type;
> +EXPORT_SYMBOL(x86_hyper_type);
>  
>  static inline const struct hypervisor_x86 * __init
>  detect_hypervisor_vendor(void)
> @@ -87,6 +93,6 @@ void __init init_hypervisor_platform(void)
>  	copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
>  	copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
>  
> -	x86_hyper = h;
> +	x86_hyper_type = h->type;
>  	x86_init.hyper.init_platform();
>  }
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 6bb84d655e4b..85eb5fc180c8 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -254,9 +254,9 @@ static void __init ms_hyperv_init_platform(void)
>  #endif
>  }
>  
> -const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
> +const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
>  	.name			= "Microsoft Hyper-V",
>  	.detect			= ms_hyperv_platform,
> +	.type			= X86_HYPER_MS_HYPERV,
>  	.init.init_platform	= ms_hyperv_init_platform,
>  };
> -EXPORT_SYMBOL(x86_hyper_ms_hyperv);
> diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
> index 4804c1d063c8..8e005329648b 100644
> --- a/arch/x86/kernel/cpu/vmware.c
> +++ b/arch/x86/kernel/cpu/vmware.c
> @@ -205,10 +205,10 @@ static bool __init vmware_legacy_x2apic_available(void)
>  	       (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
>  }
>  
> -const __refconst struct hypervisor_x86 x86_hyper_vmware = {
> +const __initconst struct hypervisor_x86 x86_hyper_vmware = {
>  	.name			= "VMware",
>  	.detect			= vmware_platform,
> +	.type			= X86_HYPER_VMWARE,
>  	.init.init_platform	= vmware_platform_setup,
>  	.init.x2apic_available	= vmware_legacy_x2apic_available,
>  };
> -EXPORT_SYMBOL(x86_hyper_vmware);
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index 9dca8437c795..a94de09edbed 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -544,12 +544,12 @@ static uint32_t __init kvm_detect(void)
>  	return kvm_cpuid_base();
>  }
>  
> -const struct hypervisor_x86 x86_hyper_kvm __refconst = {
> +const __initconst struct hypervisor_x86 x86_hyper_kvm = {
>  	.name			= "KVM",
>  	.detect			= kvm_detect,
> +	.type			= X86_HYPER_KVM,
>  	.init.x2apic_available	= kvm_para_available,
>  };
> -EXPORT_SYMBOL_GPL(x86_hyper_kvm);
>  
>  static __init int activate_jump_labels(void)
>  {
> diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
> index 7b1622089f96..754d5391d9fa 100644
> --- a/arch/x86/xen/enlighten_hvm.c
> +++ b/arch/x86/xen/enlighten_hvm.c
> @@ -226,12 +226,12 @@ static uint32_t __init xen_platform_hvm(void)
>  	return xen_cpuid_base();
>  }
>  
> -const struct hypervisor_x86 x86_hyper_xen_hvm = {
> +const __initconst struct hypervisor_x86 x86_hyper_xen_hvm = {
>  	.name                   = "Xen HVM",
>  	.detect                 = xen_platform_hvm,
> +	.type			= X86_HYPER_XEN_HVM,
>  	.init.init_platform     = xen_hvm_guest_init,
>  	.init.x2apic_available  = xen_x2apic_para_available,
>  	.init.init_mem_mapping	= xen_hvm_init_mem_mapping,
>  	.runtime.pin_vcpu       = xen_pin_vcpu,
>  };
> -EXPORT_SYMBOL(x86_hyper_xen_hvm);
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index 69d1a7054ddb..168efb2534c0 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -1460,9 +1460,9 @@ static uint32_t __init xen_platform_pv(void)
>  	return 0;
>  }
>  
> -const struct hypervisor_x86 x86_hyper_xen_pv = {
> +const __initconst struct hypervisor_x86 x86_hyper_xen_pv = {
>  	.name                   = "Xen PV",
>  	.detect                 = xen_platform_pv,
> +	.type			= X86_HYPER_XEN_PV,
>  	.runtime.pin_vcpu       = xen_pin_vcpu,
>  };
> -EXPORT_SYMBOL(x86_hyper_xen_pv);
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 937801ac2fe0..2cd134dd94d2 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1534,7 +1534,7 @@ static int __init hv_acpi_init(void)
>  {
>  	int ret, t;
>  
> -	if (x86_hyper != &x86_hyper_ms_hyperv)
> +	if (x86_hyper_type != X86_HYPER_MS_HYPERV)
>  		return -ENODEV;
>  
>  	init_completion(&probe_event);
> diff --git a/drivers/input/mouse/vmmouse.c b/drivers/input/mouse/vmmouse.c
> index 0f586780ceb4..1ae5c1ef3f5b 100644
> --- a/drivers/input/mouse/vmmouse.c
> +++ b/drivers/input/mouse/vmmouse.c
> @@ -316,11 +316,9 @@ static int vmmouse_enable(struct psmouse *psmouse)
>  /*
>   * Array of supported hypervisors.
>   */
> -static const struct hypervisor_x86 *vmmouse_supported_hypervisors[] = {
> -	&x86_hyper_vmware,
> -#ifdef CONFIG_KVM_GUEST
> -	&x86_hyper_kvm,
> -#endif
> +static enum x86_hypervisor_type vmmouse_supported_hypervisors[] = {
> +	X86_HYPER_VMWARE,
> +	X86_HYPER_KVM,
>  };
>  
>  /**
> @@ -331,7 +329,7 @@ static bool vmmouse_check_hypervisor(void)
>  	int i;
>  
>  	for (i = 0; i < ARRAY_SIZE(vmmouse_supported_hypervisors); i++)
> -		if (vmmouse_supported_hypervisors[i] == x86_hyper)
> +		if (vmmouse_supported_hypervisors[i] == x86_hyper_type)
>  			return true;
>  
>  	return false;
> diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
> index 1e688bfec567..9047c0a529b2 100644
> --- a/drivers/misc/vmw_balloon.c
> +++ b/drivers/misc/vmw_balloon.c
> @@ -1271,7 +1271,7 @@ static int __init vmballoon_init(void)
>  	 * Check if we are running on VMware's hypervisor and bail out
>  	 * if we are not.
>  	 */
> -	if (x86_hyper != &x86_hyper_vmware)
> +	if (x86_hyper_type != X86_HYPER_VMWARE)
>  		return -ENODEV;
>  
>  	for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES;
> -- 
> 2.12.3
> 

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