Saurabh Sengar e6676de778 x86/ioapic: Don't return 0 from arch_dynirq_lower_bound() ... [ Upstream commit 5af507bef9 ] arch_dynirq_lower_bound() is invoked by the core interrupt code to retrieve the lowest possible Linux interrupt number for dynamically allocated interrupts like MSI. The x86 implementation uses this to exclude the IO/APIC GSI space. This works correctly as long as there is an IO/APIC registered, but returns 0 if not. This has been observed in VMs where the BIOS does not advertise an IO/APIC. 0 is an invalid interrupt number except for the legacy timer interrupt on x86. The return value is unchecked in the core code, so it ends up to allocate interrupt number 0 which is subsequently considered to be invalid by the caller, e.g. the MSI allocation code. The function has already a check for 0 in the case that an IO/APIC is registered, as ioapic_dynirq_base is 0 in case of device tree setups. Consolidate this and zero check for both ioapic_dynirq_base and gsi_top, which is used in the case that no IO/APIC is registered. Fixes: 3e5bedc2c2 ("x86/apic: Fix arch_dynirq_lower_bound() bug for DT enabled machines") Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/1679988604-20308-1-git-send-email-ssengar@linux.microsoft.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-05-11 23:11:06 +09:00
..
boot	x86/sev: Add SEV-SNP guest feature negotiation support	2023-01-19 17:29:58 +01:00
coco	x86/insn: Avoid namespace clash by separating instruction decoder MMIO type from MMIO trace type	2023-01-03 18:46:06 +01:00
configs
crypto	crypto: x86/ghash - fix unaligned access in ghash_setkey()	2023-03-10 09:28:04 +01:00
entry	- Add the call depth tracking mitigation for Retbleed which has	2022-12-14 15:03:00 -08:00
events	perf/x86/amd/core: Always clear status for idx	2023-03-30 12:51:24 +02:00
hyperv
ia32
include	x86/cpu: Add model number for Intel Arrow Lake processor	2023-05-11 23:10:48 +09:00
kernel	x86/ioapic: Don't return 0 from arch_dynirq_lower_bound()	2023-05-11 23:11:06 +09:00
kvm	KVM: nVMX: Emulate NOPs in L2, and PAUSE if it's not intercepted	2023-05-11 23:10:52 +09:00
lib	x86/insn: Avoid namespace clash by separating instruction decoder MMIO type from MMIO trace type	2023-01-03 18:46:06 +01:00
math-emu
mm	x86/mm: Do not shuffle CPU entry areas without KASLR	2023-03-30 12:51:32 +02:00
net	- Add the call depth tracking mitigation for Retbleed which has	2022-12-14 15:03:00 -08:00
pci	x86/PCI: Add quirk for AMD XHCI controller that loses MSI-X state in D3hot	2023-04-20 12:36:59 +02:00
platform	pci-v6.2-changes	2022-12-14 09:54:10 -08:00
power	- Add the call depth tracking mitigation for Retbleed which has	2022-12-14 15:03:00 -08:00
purgatory	purgatory: fix disabling debug info	2023-04-26 14:30:07 +02:00
ras
realmode
tools
um	x86: um: vdso: Add '%rcx' and '%r11' to the syscall clobber list	2023-03-11 13:50:27 +01:00
video
virt/vmx/tdx
xen	x86/PVH: avoid 32-bit build warning when obtaining VGA console info	2023-04-06 12:12:48 +02:00
.gitignore
Kbuild
Kconfig	powerpc updates for 6.2	2022-12-19 07:13:33 -06:00
Kconfig.assembler
Kconfig.cpu
Kconfig.debug
Makefile	x86/build: Move '-mindirect-branch-cs-prefix' out of GCC-only block	2023-01-22 11:36:45 +01:00
Makefile.um	um: Only disable SSE on clang to work around old GCC bugs	2023-05-01 08:29:22 +09:00
Makefile_32.cpu