[PATCH v2] asm-generic: Remove the parameters of the generate_guest_id function and modify the return type and modify the function name

Li kunyu
2022-09-20T03:28:47Z

The generate_guest_id function is more suitable for use after the
following modifications.
1. Modify the type of the guest_id variable to u64, which is compatible
with the caller.
2. Remove all parameters from the function, and write the parameter
(LINUX_VERSION_CODE) passed in by the actual call into the function
implementation.
3. Rename the function to make it clearly a Hyper-V related function,
and modify it to hv_generate_guest_id.

v2:
Fix generate_guest_id to hv_generate_guest_id.

Signed-off-by: Li kunyu <kunyu@nfschina.com>
---
arch/arm64/hyperv/mshyperv.c | 2 +-
arch/x86/hyperv/hv_init.c | 2 +-
include/asm-generic/mshyperv.h | 12 +++++-------
3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index bbbe351e9045..3863fd226e0e 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();
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..93770791b858 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();
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..7f4a23cee56f 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -25,6 +25,7 @@
#include <linux/nmi.h>
#include <asm/ptrace.h>
#include <asm/hyperv-tlfs.h>
+#include <linux/version.h>

struct ms_hyperv_info {
u32 features;
@@ -105,15 +106,12 @@ 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(void)
{
- __u64 guest_id = 0;
+ u64 guest_id;

- guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
- guest_id |= (d_info1 << 48);
- guest_id |= (kernel_version << 16);
- guest_id |= d_info2;
+ guest_id = (((u64)HV_LINUX_VENDOR_ID) << 48);
+ guest_id |= (((u64)LINUX_VERSION_CODE) << 16);

return guest_id;
}
--
2.18.2