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author | Alexander Graf <agraf@suse.de> | 2010-08-15 08:04:24 +0200 |
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committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:52:15 +0200 |
commit | 8b6db3bc965c204db6868d4005808b4fdc9c46d7 (patch) | |
tree | 973d040d221d5fd3448c97b1c102d014fe6e6687 /arch/powerpc/include | |
parent | ad0873763a83e7b31ba87a85ec2027dd6a9d7b55 (diff) | |
download | op-kernel-dev-8b6db3bc965c204db6868d4005808b4fdc9c46d7.zip op-kernel-dev-8b6db3bc965c204db6868d4005808b4fdc9c46d7.tar.gz |
KVM: PPC: Implement correct SID mapping on Book3s_32
Up until now we were doing segment mappings wrong on Book3s_32. For Book3s_64
we were using a trick where we know that a single mmu_context gives us 16 bits
of context ids.
The mm system on Book3s_32 instead uses a clever algorithm to distribute VSIDs
across the available range, so a context id really only gives us 16 available
VSIDs.
To keep at least a few guest processes in the SID shadow, let's map a number of
contexts that we can use as VSID pool. This makes the code be actually correct
and shouldn't hurt performance too much.
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r-- | arch/powerpc/include/asm/kvm_book3s.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index be8aac2..d62e703 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -60,6 +60,13 @@ struct kvmppc_sid_map { #define SID_MAP_NUM (1 << SID_MAP_BITS) #define SID_MAP_MASK (SID_MAP_NUM - 1) +#ifdef CONFIG_PPC_BOOK3S_64 +#define SID_CONTEXTS 1 +#else +#define SID_CONTEXTS 128 +#define VSID_POOL_SIZE (SID_CONTEXTS * 16) +#endif + struct kvmppc_vcpu_book3s { struct kvm_vcpu vcpu; struct kvmppc_book3s_shadow_vcpu *shadow_vcpu; @@ -78,10 +85,14 @@ struct kvmppc_vcpu_book3s { u64 sdr1; u64 hior; u64 msr_mask; - u64 vsid_first; u64 vsid_next; +#ifdef CONFIG_PPC_BOOK3S_32 + u32 vsid_pool[VSID_POOL_SIZE]; +#else + u64 vsid_first; u64 vsid_max; - int context_id; +#endif + int context_id[SID_CONTEXTS]; ulong prog_flags; /* flags to inject when giving a 700 trap */ }; |