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linux/arch/x86/hyperv
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Nuno Das Neves c3bb76822c x86/hyperv: Fix usage of cpu_online_mask to get valid cpu 
[ Upstream commit bb169f80ed ]

Accessing cpu_online_mask here is problematic because the cpus read lock
is not held in this context.

However, cpu_online_mask isn't needed here since the effective affinity
mask is guaranteed to be valid in this callback. So, just use
cpumask_first() to get the cpu instead of ANDing it with cpus_online_mask
unnecessarily.

Fixes: e39397d1fd ("x86/hyperv: implement an MSI domain for root partition")
Reported-by: Michael Kelley <mhklinux@outlook.com>
Closes: https://lore.kernel.org/linux-hyperv/SN6PR02MB4157639630F8AD2D8FD8F52FD475A@SN6PR02MB4157.namprd02.prod.outlook.com/
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1751582677-30930-4-git-send-email-nunodasneves@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1751582677-30930-4-git-send-email-nunodasneves@linux.microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-15 12:04:46 +02:00
..
hv_apic.c KVM: x86: lapic: Rename [GET/SET]_APIC_DEST_FIELD to [GET/SET]_XAPIC_DEST_FIELD 2022-06-24 12:44:34 -04:00
hv_init.c x86/hyperv: Fix the detection of E820_TYPE_PRAM in a Gen2 VM 2023-12-20 17:00:21 +01:00
hv_proc.c drivers: hv: Create a consistent pattern for checking Hyper-V hypercall status 2021-04-21 09:49:19 +00:00
hv_spinlock.c x86/hyperv: Fix unused variable 'msr_val' warning in hv_qlock_wait 2021-03-24 11:31:04 +00:00
irqdomain.c x86/hyperv: Fix usage of cpu_online_mask to get valid cpu 2025-08-15 12:04:46 +02:00
ivm.c x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM 2022-06-15 18:27:40 +00:00
Makefile x86/hyperv: Add new hvcall guest address host visibility support 2021-10-28 11:21:33 +00:00
mmu.c x86/hyperv: Properly deal with empty cpumasks in hyperv_flush_tlb_multi() 2022-01-10 11:50:20 +00:00
nested.c drivers: hv: Create a consistent pattern for checking Hyper-V hypercall status 2021-04-21 09:49:19 +00:00