From: David Matlack <dmatlack@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
seanjc@google.com, vkuznets@redhat.com
Subject: Re: [PATCH 05/23] KVM: MMU: pull computation of kvm_mmu_role_regs to kvm_init_mmu
Date: Fri, 4 Feb 2022 18:45:37 +0000 [thread overview]
Message-ID: <Yf10UbHmV85rFz6G@google.com> (raw)
In-Reply-To: <20220204115718.14934-6-pbonzini@redhat.com>
On Fri, Feb 04, 2022 at 06:57:00AM -0500, Paolo Bonzini wrote:
> The init_kvm_*mmu functions, with the exception of shadow NPT,
> do not need to know the full values of CR0/CR4/EFER; they only
> need to know the bits that make up the "role". This cleanup
> however will take quite a few incremental steps. As a start,
> pull the common computation of the struct kvm_mmu_role_regs
> into their caller: all of them extract the struct from the vcpu
> as the very first step.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 33 +++++++++++++++++----------------
> 1 file changed, 17 insertions(+), 16 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 3add9d8b0630..577e70509510 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -4736,12 +4736,12 @@ kvm_calc_tdp_mmu_root_page_role(struct kvm_vcpu *vcpu,
> return role;
> }
>
> -static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
> +static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
> + const struct kvm_mmu_role_regs *regs)
> {
> struct kvm_mmu *context = &vcpu->arch.root_mmu;
> - struct kvm_mmu_role_regs regs = vcpu_to_role_regs(vcpu);
> union kvm_mmu_role new_role =
> - kvm_calc_tdp_mmu_root_page_role(vcpu, ®s, false);
> + kvm_calc_tdp_mmu_root_page_role(vcpu, regs, false);
>
> if (new_role.as_u64 == context->mmu_role.as_u64)
> return;
> @@ -4755,7 +4755,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
> context->get_guest_pgd = get_cr3;
> context->get_pdptr = kvm_pdptr_read;
> context->inject_page_fault = kvm_inject_page_fault;
> - context->root_level = role_regs_to_root_level(®s);
> + context->root_level = role_regs_to_root_level(regs);
>
> if (!is_cr0_pg(context))
> context->gva_to_gpa = nonpaging_gva_to_gpa;
> @@ -4803,7 +4803,7 @@ kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu,
> }
>
> static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *context,
> - struct kvm_mmu_role_regs *regs,
> + const struct kvm_mmu_role_regs *regs,
> union kvm_mmu_role new_role)
> {
> if (new_role.as_u64 == context->mmu_role.as_u64)
> @@ -4824,7 +4824,7 @@ static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *conte
> }
>
> static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu,
> - struct kvm_mmu_role_regs *regs)
> + const struct kvm_mmu_role_regs *regs)
> {
> struct kvm_mmu *context = &vcpu->arch.root_mmu;
> union kvm_mmu_role new_role =
> @@ -4845,7 +4845,7 @@ static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu,
>
> static union kvm_mmu_role
> kvm_calc_shadow_npt_root_page_role(struct kvm_vcpu *vcpu,
> - struct kvm_mmu_role_regs *regs)
> + const struct kvm_mmu_role_regs *regs)
Should these go in the previous commit? Aside from that,
Reviewed-by: David Matlack <dmatlack@google>
> {
> union kvm_mmu_role role =
> kvm_calc_shadow_root_page_role_common(vcpu, regs, false);
> @@ -4930,12 +4930,12 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
> }
> EXPORT_SYMBOL_GPL(kvm_init_shadow_ept_mmu);
>
> -static void init_kvm_softmmu(struct kvm_vcpu *vcpu)
> +static void init_kvm_softmmu(struct kvm_vcpu *vcpu,
> + const struct kvm_mmu_role_regs *regs)
> {
> struct kvm_mmu *context = &vcpu->arch.root_mmu;
> - struct kvm_mmu_role_regs regs = vcpu_to_role_regs(vcpu);
>
> - kvm_init_shadow_mmu(vcpu, ®s);
> + kvm_init_shadow_mmu(vcpu, regs);
>
> context->get_guest_pgd = get_cr3;
> context->get_pdptr = kvm_pdptr_read;
> @@ -4959,10 +4959,9 @@ kvm_calc_nested_mmu_role(struct kvm_vcpu *vcpu, const struct kvm_mmu_role_regs *
> return role;
> }
>
> -static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
> +static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu, const struct kvm_mmu_role_regs *regs)
> {
> - struct kvm_mmu_role_regs regs = vcpu_to_role_regs(vcpu);
> - union kvm_mmu_role new_role = kvm_calc_nested_mmu_role(vcpu, ®s);
> + union kvm_mmu_role new_role = kvm_calc_nested_mmu_role(vcpu, regs);
> struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
>
> if (new_role.as_u64 == g_context->mmu_role.as_u64)
> @@ -5002,12 +5001,14 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
>
> void kvm_init_mmu(struct kvm_vcpu *vcpu)
> {
> + struct kvm_mmu_role_regs regs = vcpu_to_role_regs(vcpu);
> +
> if (mmu_is_nested(vcpu))
> - init_kvm_nested_mmu(vcpu);
> + init_kvm_nested_mmu(vcpu, ®s);
> else if (tdp_enabled)
> - init_kvm_tdp_mmu(vcpu);
> + init_kvm_tdp_mmu(vcpu, ®s);
> else
> - init_kvm_softmmu(vcpu);
> + init_kvm_softmmu(vcpu, ®s);
> }
> EXPORT_SYMBOL_GPL(kvm_init_mmu);
>
> --
> 2.31.1
>
>
next prev parent reply other threads:[~2022-02-04 18:45 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 11:56 [PATCH 00/23] KVM: MMU: MMU role refactoring Paolo Bonzini
2022-02-04 11:56 ` [PATCH 01/23] KVM: MMU: pass uses_nx directly to reset_shadow_zero_bits_mask Paolo Bonzini
2022-02-04 17:59 ` David Matlack
2022-02-05 14:52 ` Paolo Bonzini
2022-02-07 16:09 ` Sean Christopherson
2022-02-07 21:50 ` David Matlack
2022-02-10 0:30 ` Sean Christopherson
2022-02-10 16:38 ` Paolo Bonzini
2022-02-04 11:56 ` [PATCH 02/23] KVM: MMU: nested EPT cannot be used in SMM Paolo Bonzini
2022-02-04 18:16 ` David Matlack
2022-02-09 22:43 ` Sean Christopherson
2022-02-04 11:56 ` [PATCH 03/23] KVM: MMU: remove valid from extended role Paolo Bonzini
2022-02-04 18:32 ` David Matlack
2022-02-05 14:50 ` Paolo Bonzini
2022-02-09 22:54 ` Sean Christopherson
2022-02-10 9:53 ` Paolo Bonzini
2022-02-04 11:56 ` [PATCH 04/23] KVM: MMU: constify uses of struct kvm_mmu_role_regs Paolo Bonzini
2022-02-04 18:41 ` David Matlack
2022-02-09 22:57 ` Sean Christopherson
2022-02-04 11:57 ` [PATCH 05/23] KVM: MMU: pull computation of kvm_mmu_role_regs to kvm_init_mmu Paolo Bonzini
2022-02-04 18:45 ` David Matlack [this message]
2022-02-04 11:57 ` [PATCH 06/23] KVM: MMU: load new PGD once nested two-dimensional paging is initialized Paolo Bonzini
2022-02-04 19:18 ` David Matlack
2022-02-07 13:50 ` Paolo Bonzini
2022-02-07 14:35 ` Paolo Bonzini
2022-02-09 12:34 ` Paolo Bonzini
2022-02-04 11:57 ` [PATCH 07/23] KVM: MMU: remove kvm_mmu_calc_root_page_role Paolo Bonzini
2022-02-04 19:32 ` David Matlack
2022-02-05 14:46 ` Paolo Bonzini
2022-02-10 0:47 ` Sean Christopherson
2022-02-10 9:52 ` Paolo Bonzini
2022-02-10 17:29 ` Sean Christopherson
2022-02-10 17:43 ` Paolo Bonzini
2022-02-04 11:57 ` [PATCH 08/23] KVM: MMU: rephrase unclear comment Paolo Bonzini
2022-02-04 19:38 ` David Matlack
2022-02-04 11:57 ` [PATCH 09/23] KVM: MMU: remove "bool base_only" arguments Paolo Bonzini
2022-02-04 19:41 ` David Matlack
2022-02-04 11:57 ` [PATCH 10/23] KVM: MMU: split cpu_role from mmu_role Paolo Bonzini
2022-02-04 21:57 ` David Matlack
2022-02-05 14:49 ` Paolo Bonzini
2022-02-07 21:38 ` David Matlack
2022-02-04 11:57 ` [PATCH 11/23] KVM: MMU: do not recompute root level from kvm_mmu_role_regs Paolo Bonzini
2022-02-07 22:10 ` David Matlack
2022-02-07 22:17 ` David Matlack
2022-02-04 11:57 ` [PATCH 12/23] KVM: MMU: remove ept_ad field Paolo Bonzini
2022-02-04 11:57 ` [PATCH 13/23] KVM: MMU: remove kvm_calc_shadow_root_page_role_common Paolo Bonzini
2022-02-07 22:25 ` David Matlack
2022-02-04 11:57 ` [PATCH 14/23] KVM: MMU: cleanup computation of MMU roles for two-dimensional paging Paolo Bonzini
2022-02-04 11:57 ` [PATCH 15/23] KVM: MMU: cleanup computation of MMU roles for shadow paging Paolo Bonzini
2022-02-04 11:57 ` [PATCH 16/23] KVM: MMU: remove extended bits from mmu_role Paolo Bonzini
2022-02-04 11:57 ` [PATCH 17/23] KVM: MMU: remove redundant bits from extended role Paolo Bonzini
2022-02-04 11:57 ` [PATCH 18/23] KVM: MMU: fetch shadow EFER.NX from MMU role Paolo Bonzini
2022-02-04 11:57 ` [PATCH 19/23] KVM: MMU: simplify and/or inline computation of shadow MMU roles Paolo Bonzini
2022-02-04 11:57 ` [PATCH 20/23] KVM: MMU: pull CPU role computation to kvm_init_mmu Paolo Bonzini
2022-02-07 22:42 ` David Matlack
2022-02-04 11:57 ` [PATCH 21/23] KVM: MMU: store shadow_root_level into mmu_role Paolo Bonzini
2022-02-07 23:00 ` David Matlack
2022-02-04 11:57 ` [PATCH 22/23] KVM: MMU: use cpu_role for root_level Paolo Bonzini
2022-02-07 23:01 ` David Matlack
2022-02-04 11:57 ` [PATCH 23/23] KVM: MMU: replace direct_map with mmu_role.direct Paolo Bonzini
2022-02-07 23:02 ` David Matlack
2022-02-07 23:08 ` [PATCH 00/23] KVM: MMU: MMU role refactoring David Matlack
2022-02-07 23:27 ` Sean Christopherson
2022-02-07 23:53 ` David Matlack
2022-02-10 1:11 ` Sean Christopherson
2022-02-10 11:58 ` Paolo Bonzini
2022-02-10 16:55 ` Sean Christopherson
2022-02-10 17:30 ` Paolo Bonzini
2022-02-10 19:28 ` Sean Christopherson
2022-02-09 22:31 ` Sean Christopherson
2022-02-10 9:54 ` Paolo Bonzini
2022-02-14 18:14 ` David Matlack
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