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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-12 20:34:16 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-12 20:34:16 +0300 |
commit | 7d62159919c90fbcd9ee808e9f1b776eae990d53 (patch) | |
tree | a5deb873ea9db3e055e4e7c577ab1326b651737c /arch/x86/kernel/cpu | |
parent | 43686598b55785bfc1f961b3731b2302fe08f393 (diff) | |
parent | 32c97d980e2eef25465d453f2956a9ca68926a3c (diff) | |
download | linux-7d62159919c90fbcd9ee808e9f1b776eae990d53.tar.xz |
Merge tag 'hyperv-next-signed-20221208' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv updates from Wei Liu:
- Drop unregister syscore from hyperv_cleanup to avoid hang (Gaurav
Kohli)
- Clean up panic path for Hyper-V framebuffer (Guilherme G. Piccoli)
- Allow IRQ remapping to work without x2apic (Nuno Das Neves)
- Fix comments (Olaf Hering)
- Expand hv_vp_assist_page definition (Saurabh Sengar)
- Improvement to page reporting (Shradha Gupta)
- Make sure TSC clocksource works when Linux runs as the root partition
(Stanislav Kinsburskiy)
* tag 'hyperv-next-signed-20221208' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
x86/hyperv: Remove unregister syscore call from Hyper-V cleanup
iommu/hyper-v: Allow hyperv irq remapping without x2apic
clocksource: hyper-v: Add TSC page support for root partition
clocksource: hyper-v: Use TSC PFN getter to map vvar page
clocksource: hyper-v: Introduce TSC PFN getter
clocksource: hyper-v: Introduce a pointer to TSC page
x86/hyperv: Expand definition of struct hv_vp_assist_page
PCI: hv: update comment in x86 specific hv_arch_irq_unmask
hv: fix comment typo in vmbus_channel/low_latency
drivers: hv, hyperv_fb: Untangle and refactor Hyper-V panic notifiers
video: hyperv_fb: Avoid taking busy spinlock on panic path
hv_balloon: Add support for configurable order free page reporting
mm/page_reporting: Add checks for page_reporting_order param
Diffstat (limited to 'arch/x86/kernel/cpu')
-rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 831613959a92..46668e255421 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -475,6 +475,12 @@ static bool __init ms_hyperv_x2apic_available(void) * (logically) generates MSIs directly to the system APIC irq domain. * There is no HPET, and PCI MSI/MSI-X interrupts are remapped by the * pci-hyperv host bridge. + * + * Note: for a Hyper-V root partition, this will always return false. + * The hypervisor doesn't expose these HYPERV_CPUID_VIRT_STACK_* cpuids by + * default, they are implemented as intercepts by the Windows Hyper-V stack. + * Even a nested root partition (L2 root) will not get them because the + * nested (L1) hypervisor filters them out. */ static bool __init ms_hyperv_msi_ext_dest_id(void) { |