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| author | Joseph Salisbury <joseph.salisbury@microsoft.com> | 2021-04-16 17:43:02 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-04-21 09:49:19 +0000 |
| commit | 6523592cee4650c6aa997d69cd0045a01e07a1ef (patch) | |
| tree | 2b0317101dee865a77ea6e47a52538de4df9b106 /include/asm-generic/mshyperv.h | |
| parent | aa5b7d11c7cb87c266d705b237368985e7171958 (diff) | |
| download | lwn-6523592cee4650c6aa997d69cd0045a01e07a1ef.tar.gz lwn-6523592cee4650c6aa997d69cd0045a01e07a1ef.zip | |
x86/hyperv: Move hv_do_rep_hypercall to asm-generic
This patch makes no functional changes. It simply moves hv_do_rep_hypercall()
out of arch/x86/include/asm/mshyperv.h and into asm-generic/mshyperv.h
hv_do_rep_hypercall() is architecture independent, so it makes sense that it
should be in the architecture independent mshyperv.h, not in the x86-specific
mshyperv.h.
This is done in preperation for a follow up patch which creates a consistent
pattern for checking Hyper-V hypercall status.
Signed-off-by: Joseph Salisbury <joseph.salisbury@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1618620183-9967-1-git-send-email-joseph.salisbury@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/asm-generic/mshyperv.h')
| -rw-r--r-- | include/asm-generic/mshyperv.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 63c0e579bf6d..301db9adc82d 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -41,6 +41,37 @@ extern struct ms_hyperv_info ms_hyperv; extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); +/* + * Rep hypercalls. Callers of this functions are supposed to ensure that + * rep_count and varhead_size comply with Hyper-V hypercall definition. + */ +static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size, + void *input, void *output) +{ + u64 control = code; + u64 status; + u16 rep_comp; + + control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET; + control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET; + + do { + status = hv_do_hypercall(control, input, output); + if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) + return status; + + /* Bits 32-43 of status have 'Reps completed' data. */ + rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >> + HV_HYPERCALL_REP_COMP_OFFSET; + + control &= ~HV_HYPERCALL_REP_START_MASK; + control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET; + + touch_nmi_watchdog(); + } while (rep_comp < rep_count); + + return status; +} /* Generate the guest OS identifier as described in the Hyper-V TLFS */ static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version, |