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| author | Huacai Chen <chenhc@lemote.com> | 2020-05-23 09:56:37 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-04 19:50:39 +0200 |
| commit | f21db3090de2c056728dee76d5fb66343aaf6dd1 (patch) | |
| tree | 4b5789f4ca1a6f9d4c9f3aa83faac86d190aab4b /arch/mips/kvm/mips.c | |
| parent | KVM: MIPS: Add more types of virtual interrupts (diff) | |
| download | linux-f21db3090de2c056728dee76d5fb66343aaf6dd1.tar.xz linux-f21db3090de2c056728dee76d5fb66343aaf6dd1.zip | |
KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support
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>
Diffstat (limited to 'arch/mips/kvm/mips.c')
| -rw-r--r-- | arch/mips/kvm/mips.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 6b435c6e5018..e4d42e03ec37 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -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; } |