[PATCH v6] hyperv: simplify and rename generate_guest_id

[PATCH v6] hyperv: simplify and rename generate_guest_id

[Li kunyu]

The generate_guest_id function is more suitable for use after the
following modifications.
1. The return value of the function is modified to u64.
2. Remove the d_info1 and d_info2 parameters from the function, keep the
u64 type kernel_version parameter.
3. Rename the function to make it clearly a Hyper-V related function,
and modify it to hv_generate_guest_id.

Signed-off-by: Li kunyu <kunyu@nfschina.com>

--------
 v2: Fix generate_guest_id to hv_generate_guest_id.
 v3: Fix [PATCH v2] asm-generic: Remove the ... to [PATCH v3] hyperv: simp
     lify ... and remove extra spaces
 v4: Remove #include <linux/version.h> in the calling file, and add #inclu
     de <linux/version.h> in the function implementation file
 v5: <linux/version.h> is changed to the definition position before v4, an
     d the LINUX_VERSION_CODE macro is passed in the function call
 v6: Modify the patch description information to the changed information a
     fter discussion
---
 arch/arm64/hyperv/mshyperv.c   | 2 +-
 arch/x86/hyperv/hv_init.c      | 2 +-
 include/asm-generic/mshyperv.h | 9 +++------
 3 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index bbbe351e9045..a406454578f0 100644
--- a/arch/arm64/hyperv/mshyperv.c
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -38,7 +38,7 @@ static int __init hyperv_init(void)
 		return 0;
 
 	/* Setup the guest ID */
-	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
+	guest_id = hv_generate_guest_id(LINUX_VERSION_CODE);
 	hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id);
 
 	/* Get the features and hints from Hyper-V */
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 3de6d8b53367..032d85ac33fa 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -426,7 +426,7 @@ void __init hyperv_init(void)
 	 * 1. Register the guest ID
 	 * 2. Enable the hypercall and register the hypercall page
 	 */
-	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
+	guest_id = hv_generate_guest_id(LINUX_VERSION_CODE);
 	wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);
 
 	/* Hyper-V requires to write guest os id via ghcb in SNP IVM. */
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index c05d2ce9b6cd..bfb9eb9d7215 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -105,15 +105,12 @@ static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
 }
 
 /* Generate the guest OS identifier as described in the Hyper-V TLFS */
-static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
-				       __u64 d_info2)
+static inline u64 hv_generate_guest_id(u64 kernel_version)
 {
-	__u64 guest_id = 0;
+	u64 guest_id;
 
-	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
-	guest_id |= (d_info1 << 48);
+	guest_id = (((u64)HV_LINUX_VENDOR_ID) << 48);
 	guest_id |= (kernel_version << 16);
-	guest_id |= d_info2;
 
 	return guest_id;
 }
-- 
2.18.2


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RE: [PATCH v6] hyperv: simplify and rename generate_guest_id

[Michael Kelley (LINUX)]

From: Li kunyu <kunyu@nfschina.com> Sent: Tuesday, September 27, 2022 11:41 PM
> 
> The generate_guest_id function is more suitable for use after the
> following modifications.
> 1. The return value of the function is modified to u64.
> 2. Remove the d_info1 and d_info2 parameters from the function, keep the
> u64 type kernel_version parameter.
> 3. Rename the function to make it clearly a Hyper-V related function,
> and modify it to hv_generate_guest_id.
> 
> Signed-off-by: Li kunyu <kunyu@nfschina.com>
> 
> --------
>  v2: Fix generate_guest_id to hv_generate_guest_id.
>  v3: Fix [PATCH v2] asm-generic: Remove the ... to [PATCH v3] hyperv: simp
>      lify ... and remove extra spaces
>  v4: Remove #include <linux/version.h> in the calling file, and add #inclu
>      de <linux/version.h> in the function implementation file
>  v5: <linux/version.h> is changed to the definition position before v4, an
>      d the LINUX_VERSION_CODE macro is passed in the function call
>  v6: Modify the patch description information to the changed information a
>      fter discussion
> ---
>  arch/arm64/hyperv/mshyperv.c   | 2 +-
>  arch/x86/hyperv/hv_init.c      | 2 +-
>  include/asm-generic/mshyperv.h | 9 +++------
>  3 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
> index bbbe351e9045..a406454578f0 100644
> --- a/arch/arm64/hyperv/mshyperv.c
> +++ b/arch/arm64/hyperv/mshyperv.c
> @@ -38,7 +38,7 @@ static int __init hyperv_init(void)
>  		return 0;
> 
>  	/* Setup the guest ID */
> -	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
> +	guest_id = hv_generate_guest_id(LINUX_VERSION_CODE);
>  	hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id);
> 
>  	/* Get the features and hints from Hyper-V */
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index 3de6d8b53367..032d85ac33fa 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -426,7 +426,7 @@ void __init hyperv_init(void)
>  	 * 1. Register the guest ID
>  	 * 2. Enable the hypercall and register the hypercall page
>  	 */
> -	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
> +	guest_id = hv_generate_guest_id(LINUX_VERSION_CODE);
>  	wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);
> 
>  	/* Hyper-V requires to write guest os id via ghcb in SNP IVM. */
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index c05d2ce9b6cd..bfb9eb9d7215 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -105,15 +105,12 @@ static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
>  }
> 
>  /* Generate the guest OS identifier as described in the Hyper-V TLFS */
> -static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
> -				       __u64 d_info2)
> +static inline u64 hv_generate_guest_id(u64 kernel_version)
>  {
> -	__u64 guest_id = 0;
> +	u64 guest_id;
> 
> -	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
> -	guest_id |= (d_info1 << 48);
> +	guest_id = (((u64)HV_LINUX_VENDOR_ID) << 48);
>  	guest_id |= (kernel_version << 16);
> -	guest_id |= d_info2;
> 
>  	return guest_id;
>  }
> --
> 2.18.2

Reviewed-by: Michael Kelley <mikelley@microsoft.com>


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Re: [PATCH v6] hyperv: simplify and rename generate_guest_id

[Wei Liu]

On Wed, Sep 28, 2022 at 02:40:46PM +0800, Li kunyu wrote:
> The generate_guest_id function is more suitable for use after the
> following modifications.
> 1. The return value of the function is modified to u64.
> 2. Remove the d_info1 and d_info2 parameters from the function, keep the
> u64 type kernel_version parameter.
> 3. Rename the function to make it clearly a Hyper-V related function,
> and modify it to hv_generate_guest_id.
> 
> Signed-off-by: Li kunyu <kunyu@nfschina.com>
> 
> --------
>  v2: Fix generate_guest_id to hv_generate_guest_id.
>  v3: Fix [PATCH v2] asm-generic: Remove the ... to [PATCH v3] hyperv: simp
>      lify ... and remove extra spaces
>  v4: Remove #include <linux/version.h> in the calling file, and add #inclu
>      de <linux/version.h> in the function implementation file
>  v5: <linux/version.h> is changed to the definition position before v4, an
>      d the LINUX_VERSION_CODE macro is passed in the function call
>  v6: Modify the patch description information to the changed information a
>      fter discussion

This part -- normally the change history should be stripped when the
patch is committed with git-am(1).

The usual way of doing it is to place them (and any other text that is
not intended to be committed) after three dashes. No fewer, no more,
only three dashes.

Why three dashes? Git-am(1) has the following:

  The patch is expected to be inline, directly following the message. Any line that is of the
  form:

  •   three-dashes and end-of-line, or

  •   a line that begins with "diff -", or

  •   a line that begins with "Index: "

  is taken as the beginning of a patch, and the commit log message is terminated before the
  first occurrence of such a line.

Notice the last sentence. You used eight dashes. Git-am(1) does not
consider that pattern terminates the commit log message.

There is no need for you to do anything. I've cleaned up the commit
message and applied it to hyperv-next. I thought the above tidbit can
help you (or anyone else who doesn't know about this and happens to read
this lengthy email) in your future patch submission though. :-)

Thanks,
Wei.

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Re: [PATCH v6] hyperv: simplify and rename generate_guest_id

[Li kunyu]

Thank you very much for your help, and thank the members of the mailing list (in the sending list). With your help, I learned more standard patch writing method and patch modification ideas.

thanks,
kunyu.


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