Re: [RFC PATCH v6 69/92] kvm: x86: keep the page protected if tracked by the introspection tool
On Tue, 10 Sep 2019 10:26:42 -0400, Konrad Rzeszutek Wilk wrote: > On Fri, Aug 09, 2019 at 07:00:24PM +0300, Adalbert Lazăr wrote: > > This patch might be obsolete thanks to single-stepping. > > sooo should it be skipped from this large patchset to easy > review? I'll add a couple of warning messages to check if this patch is still needed, in order to skip it from the next submission (which will be smaller:) However, on AMD, single-stepping is not an option. Thanks, Adalbert > > > > > Signed-off-by: Adalbert Lazăr > > --- > > arch/x86/kvm/x86.c | 9 +++-- > > 1 file changed, 7 insertions(+), 2 deletions(-) > > > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > > index 2c06de73a784..06f44ce8ed07 100644 > > --- a/arch/x86/kvm/x86.c > > +++ b/arch/x86/kvm/x86.c > > @@ -6311,7 +6311,8 @@ static bool reexecute_instruction(struct kvm_vcpu > > *vcpu, gva_t cr2, > > indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; > > spin_unlock(>kvm->mmu_lock); > > > > - if (indirect_shadow_pages) > > + if (indirect_shadow_pages > > + && !kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > > > return true; > > @@ -6322,7 +6323,8 @@ static bool reexecute_instruction(struct kvm_vcpu > > *vcpu, gva_t cr2, > > * and it failed try to unshadow page and re-enter the > > * guest to let CPU execute the instruction. > > */ > > - kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > + if (!kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > > + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > > > /* > > * If the access faults on its page table, it can not > > @@ -6374,6 +6376,9 @@ static bool retry_instruction(struct x86_emulate_ctxt > > *ctxt, > > if (!vcpu->arch.mmu->direct_map) > > gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); > > > > + if (kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > > + return false; > > + > > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > > > return true; ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [RFC PATCH v6 69/92] kvm: x86: keep the page protected if tracked by the introspection tool
On Fri, Aug 09, 2019 at 07:00:24PM +0300, Adalbert Lazăr wrote: > This patch might be obsolete thanks to single-stepping. sooo should it be skipped from this large patchset to easy review? > > Signed-off-by: Adalbert Lazăr > --- > arch/x86/kvm/x86.c | 9 +++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 2c06de73a784..06f44ce8ed07 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -6311,7 +6311,8 @@ static bool reexecute_instruction(struct kvm_vcpu > *vcpu, gva_t cr2, > indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; > spin_unlock(>kvm->mmu_lock); > > - if (indirect_shadow_pages) > + if (indirect_shadow_pages > + && !kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > return true; > @@ -6322,7 +6323,8 @@ static bool reexecute_instruction(struct kvm_vcpu > *vcpu, gva_t cr2, >* and it failed try to unshadow page and re-enter the >* guest to let CPU execute the instruction. >*/ > - kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > + if (!kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > /* >* If the access faults on its page table, it can not > @@ -6374,6 +6376,9 @@ static bool retry_instruction(struct x86_emulate_ctxt > *ctxt, > if (!vcpu->arch.mmu->direct_map) > gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); > > + if (kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > + return false; > + > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > > return true; ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
[RFC PATCH v6 69/92] kvm: x86: keep the page protected if tracked by the introspection tool
This patch might be obsolete thanks to single-stepping. Signed-off-by: Adalbert Lazăr --- arch/x86/kvm/x86.c | 9 +++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2c06de73a784..06f44ce8ed07 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6311,7 +6311,8 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2, indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; spin_unlock(>kvm->mmu_lock); - if (indirect_shadow_pages) + if (indirect_shadow_pages + && !kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); return true; @@ -6322,7 +6323,8 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2, * and it failed try to unshadow page and re-enter the * guest to let CPU execute the instruction. */ - kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); + if (!kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); /* * If the access faults on its page table, it can not @@ -6374,6 +6376,9 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt, if (!vcpu->arch.mmu->direct_map) gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); + if (kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) + return false; + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); return true; ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
