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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-05 11:32:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-05 11:32:03 -0800 |
| commit | 6732b3548573780cd8e0ca17d90f3f1add6c0af7 (patch) | |
| tree | cfa15d3e3f2d47a398c5e9d656b40c3a23cbc49a /arch | |
| parent | 6f3f374ac05d05cfa63d04f4479ead7e3cb6d087 (diff) | |
| parent | dbf563eee0b8cc056744514d91c5ffc2fa6c0982 (diff) | |
Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- clarify a comment (Michael Kelley)
- change a pr_warn() to pr_info() (Olaf Hering)
* tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
x86/hyperv: Clarify comment on x2apic mode
hv_balloon: disable warning when floor reached
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/hyperv/hv_apic.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c index 40e0e322161d..284e73661a18 100644 --- a/arch/x86/hyperv/hv_apic.c +++ b/arch/x86/hyperv/hv_apic.c @@ -273,11 +273,15 @@ void __init hv_apic_init(void) pr_info("Hyper-V: Using enlightened APIC (%s mode)", x2apic_enabled() ? "x2apic" : "xapic"); /* - * With x2apic, architectural x2apic MSRs are equivalent to the - * respective synthetic MSRs, so there's no need to override - * the apic accessors. The only exception is - * hv_apic_eoi_write, because it benefits from lazy EOI when - * available, but it works for both xapic and x2apic modes. + * When in x2apic mode, don't use the Hyper-V specific APIC + * accessors since the field layout in the ICR register is + * different in x2apic mode. Furthermore, the architectural + * x2apic MSRs function just as well as the Hyper-V + * synthetic APIC MSRs, so there's no benefit in having + * separate Hyper-V accessors for x2apic mode. The only + * exception is hv_apic_eoi_write, because it benefits from + * lazy EOI when available, but the same accessor works for + * both xapic and x2apic because the field layout is the same. */ apic_set_eoi_write(hv_apic_eoi_write); if (!x2apic_enabled()) { |