From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Avi Kivity <avi@redhat.com>, Alexander Graf <agraf@suse.de>,
"joro@8bytes.org" <joro@8bytes.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 14/27] KVM: MMU: Make walk_addr_generic capable for two-level walking
Date: Wed, 8 Sep 2010 11:12:52 +0200 [thread overview]
Message-ID: <20100908091252.GH2177@amd.com> (raw)
In-Reply-To: <20100907174805.GA11215@amt.cnet>
On Tue, Sep 07, 2010 at 01:48:05PM -0400, Marcelo Tosatti wrote:
> On Mon, Sep 06, 2010 at 05:55:53PM +0200, Joerg Roedel wrote:
> > This patch uses kvm_read_guest_page_tdp to make the
> > walk_addr_generic functions suitable for two-level page
> > table walking.
> >
> > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> > ---
> > arch/x86/kvm/paging_tmpl.h | 27 ++++++++++++++++++++-------
> > 1 files changed, 20 insertions(+), 7 deletions(-)
> >
> > diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
> > index cd59af1..a5b5759 100644
> > --- a/arch/x86/kvm/paging_tmpl.h
> > +++ b/arch/x86/kvm/paging_tmpl.h
> > @@ -124,6 +124,8 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
> > unsigned index, pt_access, uninitialized_var(pte_access);
> > gpa_t pte_gpa;
> > bool eperm, present, rsvd_fault;
> > + int offset;
> > + u32 error = 0;
> >
> > trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,
> > fetch_fault);
> > @@ -153,12 +155,13 @@ walk:
> > index = PT_INDEX(addr, walker->level);
> >
> > table_gfn = gpte_to_gfn(pte);
> > - pte_gpa = gfn_to_gpa(table_gfn);
> > - pte_gpa += index * sizeof(pt_element_t);
> > + offset = index * sizeof(pt_element_t);
> > + pte_gpa = gfn_to_gpa(table_gfn) + offset;
> > walker->table_gfn[walker->level - 1] = table_gfn;
> > walker->pte_gpa[walker->level - 1] = pte_gpa;
> >
> > - if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte))) {
> > + if (kvm_read_guest_page_mmu(vcpu, mmu, table_gfn, &pte, offset,
> > + sizeof(pte), &error)) {
> > present = false;
> > break;
> > }
>
> If there is failure reading the nested page tables here, you fill
> vcpu->arch.fault. But the nested fault error values will be overwritten
> at the end of walk_addr() by the original fault values?
True. Thanks for pointing that out. I will write a test-case for that
too. The results from my implemented tests show that sometimes the error
code is not reported correctly too. So I decided to do a v4 of this
patch-set with all found issues fixed.
Thanks for your review.
Joerg
next prev parent reply other threads:[~2010-09-08 9:18 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-06 15:55 [PATCH 0/27] Nested Paging Virtualization for KVM v3 (now with fixed Cc-List) Joerg Roedel
2010-09-06 15:55 ` [PATCH 01/27] KVM: MMU: Check for root_level instead of long mode Joerg Roedel
2010-09-06 15:55 ` [PATCH 02/27] KVM: MMU: Make tdp_enabled a mmu-context parameter Joerg Roedel
2010-09-06 15:55 ` [PATCH 03/27] KVM: MMU: Make set_cr3 a function pointer in kvm_mmu Joerg Roedel
2010-09-06 15:55 ` [PATCH 04/27] KVM: X86: Introduce a tdp_set_cr3 function Joerg Roedel
2010-09-06 15:55 ` [PATCH 05/27] KVM: MMU: Introduce get_cr3 function pointer Joerg Roedel
2010-09-06 15:55 ` [PATCH 06/27] KVM: MMU: Introduce inject_page_fault " Joerg Roedel
2010-09-06 15:55 ` [PATCH 07/27] KVM: MMU: Introduce kvm_init_shadow_mmu helper function Joerg Roedel
2010-09-06 15:55 ` [PATCH 08/27] KVM: MMU: Let is_rsvd_bits_set take mmu context instead of vcpu Joerg Roedel
2010-09-06 15:55 ` [PATCH 09/27] KVM: MMU: Introduce generic walk_addr function Joerg Roedel
2010-09-06 15:55 ` [PATCH 10/27] KVM: MMU: Add infrastructure for two-level page walker Joerg Roedel
2010-09-06 18:05 ` Avi Kivity
2010-09-08 9:20 ` Roedel, Joerg
2010-09-06 15:55 ` [PATCH 11/27] KVM: X86: Introduce pointer to mmu context used for gva_to_gpa Joerg Roedel
2010-09-06 15:55 ` [PATCH 12/27] KVM: MMU: Implement nested gva_to_gpa functions Joerg Roedel
2010-09-06 15:55 ` [PATCH 13/27] KVM: X86: Add kvm_read_guest_page_tdp function Joerg Roedel
2010-09-06 15:55 ` [PATCH 14/27] KVM: MMU: Make walk_addr_generic capable for two-level walking Joerg Roedel
2010-09-07 17:48 ` Marcelo Tosatti
2010-09-08 9:12 ` Roedel, Joerg [this message]
2010-09-06 15:55 ` [PATCH 15/27] KVM: MMU: Introduce kvm_read_guest_page_x86() Joerg Roedel
2010-09-06 15:55 ` [PATCH 16/27] KVM: MMU: Introduce init_kvm_nested_mmu() Joerg Roedel
2010-09-06 15:55 ` [PATCH 17/27] KVM: MMU: Track page fault data in struct vcpu Joerg Roedel
2010-09-06 18:17 ` Avi Kivity
2010-09-06 15:55 ` [PATCH 18/27] KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa Joerg Roedel
2010-09-06 15:55 ` [PATCH 19/27] KVM: X86: Propagate fetch faults Joerg Roedel
2010-09-07 18:43 ` Marcelo Tosatti
2010-09-08 9:18 ` Roedel, Joerg
2010-09-06 15:55 ` [PATCH 20/27] KVM: MMU: Add kvm_mmu parameter to load_pdptrs function Joerg Roedel
2010-09-06 15:56 ` [PATCH 21/27] KVM: MMU: Introduce kvm_pdptr_read_mmu Joerg Roedel
2010-09-06 15:56 ` [PATCH 22/27] KVM: MMU: Refactor mmu_alloc_roots function Joerg Roedel
2010-09-07 20:39 ` Marcelo Tosatti
2010-09-08 7:16 ` Avi Kivity
2010-09-08 9:16 ` Roedel, Joerg
2010-09-06 15:56 ` [PATCH 23/27] KVM: MMU: Allow long mode shadows for legacy page tables Joerg Roedel
2010-09-06 15:56 ` [PATCH 24/27] KVM: SVM: Implement MMU helper functions for Nested Nested Paging Joerg Roedel
2010-09-06 15:56 ` [PATCH 25/27] KVM: SVM: Initialize Nested Nested MMU context on VMRUN Joerg Roedel
2010-09-06 15:56 ` [PATCH 26/27] KVM: SVM: Expect two more candiates for exit_int_info Joerg Roedel
2010-09-06 15:56 ` [PATCH 27/27] KVM: SVM: Report Nested Paging support to userspace Joerg Roedel
2010-09-06 18:37 ` [PATCH 0/27] Nested Paging Virtualization for KVM v3 (now with fixed Cc-List) Avi Kivity
2010-09-07 16:35 ` Roedel, Joerg
-- strict thread matches above, loose matches on Subject: below --
2010-09-06 15:01 [PATCH 0/27] Nested Paging Virtualization for KVM v3 Joerg Roedel
2010-09-06 15:01 ` [PATCH 14/27] KVM: MMU: Make walk_addr_generic capable for two-level walking Joerg Roedel
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