From f7bc74e1c306636a659a04805474b2f8fcbd1f7e Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 20 Apr 2010 02:49:48 +0200 Subject: KVM: PPC: Improve split mode When in split mode, instruction relocation and data relocation are not equal. So far we implemented this mode by reserving a special pseudo-VSID for the two cases and flushing all PTEs when going into split mode, which is slow. Unfortunately 32bit Linux and Mac OS X use split mode extensively. So to not slow down things too much, I came up with a different idea: Mark the split mode with a bit in the VSID and then treat it like any other segment. This means we can just flush the shadow segment cache, but keep the PTEs intact. I verified that this works with ppc32 Linux and Mac OS X 10.4 guests and does speed them up. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'arch/powerpc/include/asm/kvm_book3s.h') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 5d3bd0cc4116..6f74d93725a0 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -100,11 +100,10 @@ struct kvmppc_vcpu_book3s { #define CONTEXT_GUEST 1 #define CONTEXT_GUEST_END 2 -#define VSID_REAL_DR 0x7ffffffffff00000ULL -#define VSID_REAL_IR 0x7fffffffffe00000ULL -#define VSID_SPLIT_MASK 0x7fffffffffe00000ULL -#define VSID_REAL 0x7fffffffffc00000ULL -#define VSID_BAT 0x7fffffffffb00000ULL +#define VSID_REAL 0x1fffffffffc00000ULL +#define VSID_BAT 0x1fffffffffb00000ULL +#define VSID_REAL_DR 0x2000000000000000ULL +#define VSID_REAL_IR 0x4000000000000000ULL #define VSID_PR 0x8000000000000000ULL extern void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong ea, ulong ea_mask); -- cgit v1.2.3