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| author |   Saurabh Sengar <ssengar@linux.microsoft.com> | 2022-05-27 00:43:59 -0700 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2022-06-08 12:24:50 +0000 |
| commit | 6640b5df1a38801be6d0595c8cd2177d968d7ee0 (patch) | |
| tree | 62b47d77d8479f5a447ec60f674e9ff2d0cd131d /drivers/hv/vmbus_drv.c | |
| parent | Linux 5.19-rc1 (diff) | |
| download | linux-dev-6640b5df1a38801be6d0595c8cd2177d968d7ee0.tar.xz linux-dev-6640b5df1a38801be6d0595c8cd2177d968d7ee0.zip | |
Drivers: hv: vmbus: Don't assign VMbus channel interrupts to isolated CPUs
When initially assigning a VMbus channel interrupt to a CPU, don’t choose
a managed IRQ isolated CPU (as specified on the kernel boot line with
parameter 'isolcpus=managed_irq,<#cpu>'). Also, when using sysfs to change
the CPU that a VMbus channel will interrupt, don't allow changing to a
managed IRQ isolated CPU.
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1653637439-23060-1-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 714d549b7b46..547ae334e5cd 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -21,6 +21,7 @@ #include <linux/kernel_stat.h> #include <linux/clockchips.h> #include <linux/cpu.h> +#include <linux/sched/isolation.h> #include <linux/sched/task_stack.h> #include <linux/delay.h> @@ -1770,6 +1771,9 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel, if (target_cpu >= nr_cpumask_bits) return -EINVAL; + if (!cpumask_test_cpu(target_cpu, housekeeping_cpumask(HK_TYPE_MANAGED_IRQ))) + return -EINVAL; + /* No CPUs should come up or down during this. */ cpus_read_lock(); |