From cd087eefe637d545345ea5f888d4ea4fe52e312c Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 24 Apr 2014 13:52:01 +0200 Subject: [PATCH] KVM: PPC: Book3S PR: Do dcbz32 patching with big endian instructions When the host CPU we're running on doesn't support dcbz32 itself, but the guest wants to have dcbz only clear 32 bytes of data, we loop through every executable mapped page to search for dcbz instructions and patch them with a special privileged instruction that we emulate as dcbz32. The only guests that want to see dcbz act as 32byte are book3s_32 guests, so we don't have to worry about little endian instruction ordering. So let's just always search for big endian dcbz instructions, also when we're on a little endian host. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_32_mmu.c | 2 +- arch/powerpc/kvm/book3s_pr.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c index 628d90ed417d..93503bbdae43 100644 --- a/arch/powerpc/kvm/book3s_32_mmu.c +++ b/arch/powerpc/kvm/book3s_32_mmu.c @@ -131,7 +131,7 @@ static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", - kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg, + kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg, sr_vsid(sre)); r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT); diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index d424ca053765..6e55934dda0a 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -428,8 +428,8 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) /* patch dcbz into reserved instruction, so we trap */ for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++) - if ((page[i] & 0xff0007ff) == INS_DCBZ) - page[i] &= 0xfffffff7; + if ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ) + page[i] &= cpu_to_be32(0xfffffff7); kunmap_atomic(page); put_page(hpage);