From 56028d0861e48f7cc9c573d79f2d8a0a933a2bba Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Sun, 17 Oct 2010 18:13:42 +0200 Subject: KVM: Retry fault before vmentry When page is swapped in it is mapped into guest memory only after guest tries to access it again and generate another fault. To save this fault we can map it immediately since we know that guest is going to access the page. Do it only when tdp is enabled for now. Shadow paging case is more complicated. CR[034] and EFER registers should be switched before doing mapping and then switched back. Acked-by: Rik van Riel Signed-off-by: Gleb Natapov Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/paging_tmpl.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/x86/kvm/paging_tmpl.h') diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index c45376dd041a..d6b281e989b1 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -527,8 +527,8 @@ out_gpte_changed: * Returns: 1 if we need to emulate the instruction, 0 otherwise, or * a negative value on error. */ -static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, - u32 error_code) +static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, + bool no_apf) { int write_fault = error_code & PFERR_WRITE_MASK; int user_fault = error_code & PFERR_USER_MASK; @@ -569,7 +569,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, mmu_seq = vcpu->kvm->mmu_notifier_seq; smp_rmb(); - if (try_async_pf(vcpu, walker.gfn, addr, &pfn)) + if (try_async_pf(vcpu, no_apf, walker.gfn, addr, &pfn)) return 0; /* mmio */ -- cgit v1.2.3