From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/9] KVM: x86/mmu: Add separate helper for shadow NPT root page role calc
Date: Wed, 22 Jul 2020 19:05:40 +0200 [thread overview]
Message-ID: <874kpzpjiz.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200716034122.5998-3-sean.j.christopherson@intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> Refactor the shadow NPT role calculation into a separate helper to
> better differentiate it from the non-nested shadow MMU, e.g. the NPT
> variant is never direct and derives its root level from the TDP level.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 30 +++++++++++++++++++++++++-----
> 1 file changed, 25 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 678b6209dad50..0fb033ce6cc57 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -4908,7 +4908,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
> }
>
> static union kvm_mmu_role
> -kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu, bool base_only)
> +kvm_calc_shadow_root_page_role_common(struct kvm_vcpu *vcpu, bool base_only)
> {
> union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, base_only);
>
> @@ -4916,9 +4916,19 @@ kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu, bool base_only)
> !is_write_protection(vcpu);
> role.base.smap_andnot_wp = role.ext.cr4_smap &&
> !is_write_protection(vcpu);
> - role.base.direct = !is_paging(vcpu);
> role.base.gpte_is_8_bytes = !!is_pae(vcpu);
>
> + return role;
> +}
> +
> +static union kvm_mmu_role
> +kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu, bool base_only)
> +{
> + union kvm_mmu_role role =
> + kvm_calc_shadow_root_page_role_common(vcpu, base_only);
> +
> + role.base.direct = !is_paging(vcpu);
> +
> if (!is_long_mode(vcpu))
> role.base.level = PT32E_ROOT_LEVEL;
> else if (is_la57_mode(vcpu))
> @@ -4956,14 +4966,24 @@ static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efe
> shadow_mmu_init_context(vcpu, context, cr0, cr4, efer, new_role);
> }
>
> +static union kvm_mmu_role
> +kvm_calc_shadow_npt_root_page_role(struct kvm_vcpu *vcpu)
> +{
> + union kvm_mmu_role role =
> + kvm_calc_shadow_root_page_role_common(vcpu, false);
> +
> + role.base.direct = false;
> + role.base.level = vcpu->arch.tdp_level;
> +
> + return role;
> +}
> +
> void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer,
> gpa_t nested_cr3)
> {
> struct kvm_mmu *context = &vcpu->arch.guest_mmu;
> - union kvm_mmu_role new_role =
> - kvm_calc_shadow_mmu_root_page_role(vcpu, false);
> + union kvm_mmu_role new_role = kvm_calc_shadow_npt_root_page_role(vcpu);
>
> - new_role.base.level = vcpu->arch.tdp_level;
> context->shadow_root_level = new_role.base.level;
>
> __kvm_mmu_new_pgd(vcpu, nested_cr3, new_role.base, false, false);
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
--
Vitaly
next prev parent reply other threads:[~2020-07-22 17:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 3:41 [PATCH 0/9] KVM: x86: TDP level cleanups and shadow NPT fix Sean Christopherson
2020-07-16 3:41 ` [PATCH 1/9] KVM: nSVM: Correctly set the shadow NPT root level in its MMU role Sean Christopherson
2020-07-22 17:02 ` Vitaly Kuznetsov
2020-07-16 3:41 ` [PATCH 2/9] KVM: x86/mmu: Add separate helper for shadow NPT root page role calc Sean Christopherson
2020-07-22 17:05 ` Vitaly Kuznetsov [this message]
2020-07-16 3:41 ` [PATCH 3/9] KVM: VMX: Drop a duplicate declaration of construct_eptp() Sean Christopherson
2020-07-16 3:41 ` [PATCH 4/9] KVM: VMX: Make vmx_load_mmu_pgd() static Sean Christopherson
2020-07-16 3:41 ` [PATCH 5/9] KVM: x86: Pull the PGD's level from the MMU instead of recalculating it Sean Christopherson
2020-07-22 17:11 ` Vitaly Kuznetsov
2020-07-31 16:14 ` Sean Christopherson
2020-07-16 3:41 ` [PATCH 6/9] KVM: VXM: Remove temporary WARN on expected vs. actual EPTP level mismatch Sean Christopherson
2020-07-16 3:41 ` [PATCH 7/9] KVM: x86: Dynamically calculate TDP level from max level and MAXPHYADDR Sean Christopherson
2020-07-16 3:41 ` [PATCH 8/9] KVM: x86/mmu: Rename max_page_level to max_huge_page_level Sean Christopherson
2020-07-16 3:41 ` [PATCH 9/9] KVM: x86: Specify max TDP level via kvm_configure_mmu() Sean Christopherson
2020-07-30 22:18 ` [PATCH 0/9] KVM: x86: TDP level cleanups and shadow NPT fix Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=874kpzpjiz.fsf@vitty.brq.redhat.com \
--to=vkuznets@redhat.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=sean.j.christopherson@intel.com \
--cc=wanpengli@tencent.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).