linux_dsm_epyc7002/arch
Nikita Leshenko a8bfec2930 KVM: x86: ioapic: Clear Remote IRR when entry is switched to edge-triggered
Some OSes (Linux, Xen) use this behavior to clear the Remote IRR bit for
IOAPICs without an EOI register. They simulate the EOI message manually
by changing the trigger mode to edge and then back to level, with the
entry being masked during this.

QEMU implements this feature in commit ed1263c363c9
("ioapic: clear remote irr bit for edge-triggered interrupts")

As a side effect, this commit removes an incorrect behavior where Remote
IRR was cleared when the redirection table entry was rewritten. This is not
consistent with the manual and also opens an opportunity for a strange
behavior when a redirection table entry is modified from an interrupt
handler that handles the same entry: The modification will clear the
Remote IRR bit even though the interrupt handler is still running.

Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-11-17 13:20:20 +01:00
..
alpha pci-v4.15-changes 2017-11-15 15:01:28 -08:00
arc Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
arm GICv4 Support for KVM/ARM for v4.15 2017-11-17 13:20:01 +01:00
arm64 GICv4 Support for KVM/ARM for v4.15 2017-11-17 13:20:01 +01:00
blackfin This is the bulk of pin control changes for the v4.15 2017-11-16 10:57:11 -08:00
c6x DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
cris pci-v4.15-changes 2017-11-15 15:01:28 -08:00
frv Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
h8300 mm, arch: remove empty_bad_page* 2017-11-15 18:21:03 -08:00
hexagon A couple of dma-mapping updates: 2017-11-14 16:54:12 -08:00
ia64 pci-v4.15-changes 2017-11-15 15:01:28 -08:00
m32r m32r: fix endianness constraints 2017-11-15 18:21:00 -08:00
m68k A couple of dma-mapping updates: 2017-11-14 16:54:12 -08:00
metag DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
microblaze DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
mips AFS development 2017-11-16 11:41:22 -08:00
mn10300 Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
nios2 DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
openrisc kmemcheck: remove annotations 2017-11-15 18:21:04 -08:00
parisc pci-v4.15-changes 2017-11-15 15:01:28 -08:00
powerpc First batch of KVM changes for 4.15 2017-11-16 13:00:24 -08:00
riscv RISC-V Port for Linux 4.15 v9 2017-11-15 10:49:15 -08:00
s390 First batch of KVM changes for 4.15 2017-11-16 13:00:24 -08:00
score
sh Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
sparc Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
tile mm: remove cold parameter from free_hot_cold_page* 2017-11-15 18:21:06 -08:00
um Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
unicore32 kmemcheck: stop using GFP_NOTRACK and SLAB_NOTRACK 2017-11-15 18:21:04 -08:00
x86 KVM: x86: ioapic: Clear Remote IRR when entry is switched to edge-triggered 2017-11-17 13:20:20 +01:00
xtensa pci-v4.15-changes 2017-11-15 15:01:28 -08:00
.gitignore
Kconfig