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x86/hyperv: Update comment in hyperv_cleanup()

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The comment in hyperv_cleanup() became out-of-date as a result of
commit c8ed081264 ("x86/hyperv: Use direct call to hypercall-page").

Update the comment. No code or functional change.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley 2026-02-02 08:48:39 -08:00 committed by Wei Liu
parent 2b4246153e
commit afefdb2bc9
1 changed files with 7 additions and 3 deletions
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10
arch/x86/hyperv/hv_init.c
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@ -635,9 +635,13 @@ void hyperv_cleanup(void)
hv_ivm_msr_write(HV_X64_MSR_GUEST_OS_ID, 0);
/*
* Reset hypercall page reference before reset the page,
* let hypercall operations fail safely rather than
* panic the kernel for using invalid hypercall page
* Reset hv_hypercall_pg before resetting it in the hypervisor.
* hv_set_hypercall_pg(NULL) is not used because at this point in the
* panic path other CPUs have been stopped, causing static_call_update()
* to hang. So resetting hv_hypercall_pg to cause hypercalls to fail
* cleanly is only operative on 32-bit builds. But this is OK as it is
* just a preventative measure to ease detecting a hypercall being made
* after this point, which shouldn't be happening anyway.
*/
hv_hypercall_pg = NULL;