xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: PPC: Improve split mode

Browse Source 
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 <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2010-04-20 02:49:48 +02:00
committed by Avi Kivity
parent 7fdaec997c
commit f7bc74e1c3
4 changed files with 52 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/powerpc/include/asm/kvm_book3s.h
View File

@@ -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);