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iommu/vt-d: Make posted MSI an opt-in command line option

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Add a command line opt-in option for posted MSI if CONFIG_X86_POSTED_MSI=y.

Also introduce a helper function for testing if posted MSI is supported on
the platform.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-12-jacob.jun.pan@linux.intel.com
This commit is contained in:
Jacob Pan
2024-04-23 10:41:13 -07:00
committed by Thomas Gleixner
parent ce0a928711
commit be9be07b22
3 changed files with 13 additions and 1 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -2251,6 +2251,8 @@
no_x2apic_optout
BIOS x2APIC opt-out request will be ignored
nopost disable Interrupt Posting
posted_msi
enable MSIs delivered as posted interrupts
iomem= Disable strict checking of access to MMIO memory
strict regions from userspace.

7
arch/x86/include/asm/irq_remapping.h
View File

@ -50,6 +50,13 @@ static inline struct irq_domain *arch_get_ir_parent_domain(void)
return x86_vector_domain;
}
extern bool enable_posted_msi;
static inline bool posted_msi_supported(void)
{
return enable_posted_msi && irq_remapping_cap(IRQ_POSTING_CAP);
}
#else /* CONFIG_IRQ_REMAP */
static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }

5
drivers/iommu/irq_remapping.c
View File

@ -24,6 +24,8 @@ int no_x2apic_optout;
int disable_irq_post = 0;
bool enable_posted_msi __ro_after_init;
static int disable_irq_remap;
static struct irq_remap_ops *remap_ops;
@ -70,7 +72,8 @@ static __init int setup_irqremap(char *str)
no_x2apic_optout = 1;
else if (!strncmp(str, "nopost", 6))
disable_irq_post = 1;
else if (IS_ENABLED(CONFIG_X86_POSTED_MSI) && !strncmp(str, "posted_msi", 10))
enable_posted_msi = true;
str += strcspn(str, ",");
while (*str == ',')
str++;