From: Paolo Bonzini <pbonzini@redhat.com>
To: Ben Gardon <bgardon@google.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Peter Shier <pshier@google.com>,
David Matlack <dmatlack@google.com>,
Mingwei Zhang <mizhang@google.com>,
Yulei Zhang <yulei.kernel@gmail.com>,
Wanpeng Li <kernellwp@gmail.com>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Kai Huang <kai.huang@intel.com>,
Keqian Zhu <zhukeqian1@huawei.com>,
David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH 11/15] KVM: x86/MMU: Refactor vmx_get_mt_mask
Date: Thu, 18 Nov 2021 09:30:14 +0100 [thread overview]
Message-ID: <a1be97c6-6784-fd5f-74a8-85124f039530@redhat.com> (raw)
In-Reply-To: <20211115234603.2908381-12-bgardon@google.com>
On 11/16/21 00:45, Ben Gardon wrote:
> Remove the gotos from vmx_get_mt_mask to make it easier to separate out
> the parts which do not depend on vcpu state.
>
> No functional change intended.
>
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
Queued, thanks (with a slightly edited commit message; the patch is a
simplification anyway).
Paolo
> ---
> arch/x86/kvm/vmx/vmx.c | 23 +++++++----------------
> 1 file changed, 7 insertions(+), 16 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 71f54d85f104..77f45c005f28 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -6987,7 +6987,6 @@ static int __init vmx_check_processor_compat(void)
> static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
> {
> u8 cache;
> - u64 ipat = 0;
>
> /* We wanted to honor guest CD/MTRR/PAT, but doing so could result in
> * memory aliases with conflicting memory types and sometimes MCEs.
> @@ -7007,30 +7006,22 @@ static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
> * EPT memory type is used to emulate guest CD/MTRR.
> */
>
> - if (is_mmio) {
> - cache = MTRR_TYPE_UNCACHABLE;
> - goto exit;
> - }
> + if (is_mmio)
> + return MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
>
> - if (!kvm_arch_has_noncoherent_dma(vcpu->kvm)) {
> - ipat = VMX_EPT_IPAT_BIT;
> - cache = MTRR_TYPE_WRBACK;
> - goto exit;
> - }
> + if (!kvm_arch_has_noncoherent_dma(vcpu->kvm))
> + return (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | VMX_EPT_IPAT_BIT;
>
> if (kvm_read_cr0(vcpu) & X86_CR0_CD) {
> - ipat = VMX_EPT_IPAT_BIT;
> if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
> cache = MTRR_TYPE_WRBACK;
> else
> cache = MTRR_TYPE_UNCACHABLE;
> - goto exit;
> - }
>
> - cache = kvm_mtrr_get_guest_memory_type(vcpu, gfn);
> + return (cache << VMX_EPT_MT_EPTE_SHIFT) | VMX_EPT_IPAT_BIT;
> + }
>
> -exit:
> - return (cache << VMX_EPT_MT_EPTE_SHIFT) | ipat;
> + return kvm_mtrr_get_guest_memory_type(vcpu, gfn) << VMX_EPT_MT_EPTE_SHIFT;
> }
>
> static void vmcs_set_secondary_exec_control(struct vcpu_vmx *vmx, u32 new_ctl)
>
next prev parent reply other threads:[~2021-11-18 8:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 23:45 [PATCH 00/15] Currently disabling dirty logging with the TDP MMU is extremely slow. On a 96 vCPU / 96G VM it takes ~45 seconds to disable dirty logging with the TDP MMU, as opposed to ~3.5 seconds with the legacy MMU. This series optimizes TLB flushes and introduces in-place large page promotion, to bring the disable dirty log time down to ~2 seconds Ben Gardon
2021-11-15 23:45 ` [PATCH 01/15] KVM: x86/mmu: Remove redundant flushes when disabling dirty logging Ben Gardon
2021-11-18 8:26 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 02/15] KVM: x86/mmu: Introduce vcpu_make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 03/15] KVM: x86/mmu: Factor wrprot for nested PML out of make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 04/15] KVM: x86/mmu: Factor mt_mask " Ben Gardon
2021-11-15 23:45 ` [PATCH 05/15] KVM: x86/mmu: Remove need for a vcpu from kvm_slot_page_track_is_active Ben Gardon
2021-11-18 8:25 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 06/15] KVM: x86/mmu: Remove need for a vcpu from mmu_try_to_unsync_pages Ben Gardon
2021-11-18 8:25 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 07/15] KVM: x86/mmu: Factor shadow_zero_check out of make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 08/15] KVM: x86/mmu: Replace vcpu argument with kvm pointer in make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 09/15] KVM: x86/mmu: Factor out the meat of reset_tdp_shadow_zero_bits_mask Ben Gardon
2021-11-15 23:45 ` [PATCH 10/15] KVM: x86/mmu: Propagate memslot const qualifier Ben Gardon
2021-11-18 8:27 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 11/15] KVM: x86/MMU: Refactor vmx_get_mt_mask Ben Gardon
2021-11-18 8:30 ` Paolo Bonzini [this message]
2021-11-18 15:30 ` Sean Christopherson
2021-11-19 9:02 ` Paolo Bonzini
2021-11-22 18:11 ` Ben Gardon
2021-11-22 18:46 ` Sean Christopherson
2021-11-15 23:46 ` [PATCH 12/15] KVM: x86/mmu: Factor out part of vmx_get_mt_mask which does not depend on vcpu Ben Gardon
2021-11-15 23:46 ` [PATCH 13/15] KVM: x86/mmu: Add try_get_mt_mask to x86_ops Ben Gardon
2021-11-15 23:46 ` [PATCH 14/15] KVM: x86/mmu: Make kvm_is_mmio_pfn usable outside of spte.c Ben Gardon
2021-11-15 23:46 ` [PATCH 15/15] KVM: x86/mmu: Promote pages in-place when disabling dirty logging Ben Gardon
2021-11-25 4:18 ` Peter Xu
2021-11-29 18:31 ` Ben Gardon
2021-11-30 0:13 ` Sean Christopherson
2021-11-30 7:28 ` Peter Xu
2021-11-30 16:01 ` Sean Christopherson
2021-12-01 1:59 ` Peter Xu
2021-11-15 23:58 ` [PATCH 00/15] Currently disabling dirty logging with the TDP MMU is extremely slow. On a 96 vCPU / 96G VM it takes ~45 seconds to disable dirty logging with the TDP MMU, as opposed to ~3.5 seconds with the legacy MMU. This series optimizes TLB flushes and introduces in-place large page promotion, to bring the disable dirty log time down to ~2 seconds Ben Gardon
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