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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-04-17 20:30:50 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-04-26 20:27:31 +0200 |
| commit | 54695c3088a74e25474db8eb6b490b45d1aeb0ca (patch) | |
| tree | 4ecaa9c41857cf4b380f54017830e2aeb8dc56fe /arch/powerpc/include/asm/kvm_book3s_asm.h | |
| parent | bc5ad3f3701116e7db57268e6f89010ec714697e (diff) | |
| download | linux-stable-54695c3088a74e25474db8eb6b490b45d1aeb0ca.tar.gz linux-stable-54695c3088a74e25474db8eb6b490b45d1aeb0ca.tar.bz2 linux-stable-54695c3088a74e25474db8eb6b490b45d1aeb0ca.zip | |
KVM: PPC: Book3S HV: Speed up wakeups of CPUs on HV KVM
Currently, we wake up a CPU by sending a host IPI with
smp_send_reschedule() to thread 0 of that core, which will take all
threads out of the guest, and cause them to re-evaluate their
interrupt status on the way back in.
This adds a mechanism to differentiate real host IPIs from IPIs sent
by KVM for guest threads to poke each other, in order to target the
guest threads precisely when possible and avoid that global switch of
the core to host state.
We then use this new facility in the in-kernel XICS code.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_book3s_asm.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s_asm.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_asm.h b/arch/powerpc/include/asm/kvm_book3s_asm.h index cdc3d2717cc6..9039d3c97eec 100644 --- a/arch/powerpc/include/asm/kvm_book3s_asm.h +++ b/arch/powerpc/include/asm/kvm_book3s_asm.h @@ -20,6 +20,11 @@ #ifndef __ASM_KVM_BOOK3S_ASM_H__ #define __ASM_KVM_BOOK3S_ASM_H__ +/* XICS ICP register offsets */ +#define XICS_XIRR 4 +#define XICS_MFRR 0xc +#define XICS_IPI 2 /* interrupt source # for IPIs */ + #ifdef __ASSEMBLY__ #ifdef CONFIG_KVM_BOOK3S_HANDLER @@ -81,10 +86,11 @@ struct kvmppc_host_state { #ifdef CONFIG_KVM_BOOK3S_64_HV u8 hwthread_req; u8 hwthread_state; - + u8 host_ipi; struct kvm_vcpu *kvm_vcpu; struct kvmppc_vcore *kvm_vcore; unsigned long xics_phys; + u32 saved_xirr; u64 dabr; u64 host_mmcr[3]; u32 host_pmc[8]; |