torvalds/linux
3
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-03-22 07:27:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support

Browse Source 
This patch add Loongson-3 Virtual IPI interrupt support in the kernel.
The current implementation of IPI emulation in QEMU is based on GIC for
MIPS, but Loongson-3 doesn't use GIC. Furthermore, IPI emulation in QEMU
is too expensive for performance (because of too many context switches
between Host and Guest). With current solution, the IPI delay may even
cause RCU stall warnings in a multi-core Guest. So, we design a faster
solution that emulate IPI interrupt in kernel (only used by Loongson-3
now).

Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <1590220602-3547-11-git-send-email-chenhc@lemote.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Huacai Chen
2020-05-23 15:56:37 +08:00
committed by Paolo Bonzini
parent 3f51d8fcac
commit f21db3090d
5 changed files with 277 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/mips/kvm/mips.c
View File

@@ -129,6 +129,8 @@ int kvm_arch_check_processor_compat(void *opaque)
return 0;
}
extern void kvm_init_loongson_ipi(struct kvm *kvm);
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
switch (type) {
@@ -148,6 +150,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
if (!kvm->arch.gpa_mm.pgd)
return -ENOMEM;
#ifdef CONFIG_CPU_LOONGSON64
kvm_init_loongson_ipi(kvm);
#endif
return 0;
}