From: Jim Mattson <jmattson@google.com>
To: KarimAllah Ahmed <karahmed@amazon.de>
Cc: "kvm list" <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH v3 06/13] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap
Date: Mon, 22 Oct 2018 14:42:35 -0700 [thread overview]
Message-ID: <CALMp9eRh2syfY9KjaH9h=AA1dwRnKb+S-NXEB3Hn+tjQoSrBXg@mail.gmail.com> (raw)
In-Reply-To: <1540074145-31285-7-git-send-email-karahmed@amazon.de>
On Sat, Oct 20, 2018 at 3:22 PM, KarimAllah Ahmed <karahmed@amazon.de> wrote:
> Use kvm_vcpu_map when mapping the L1 MSR bitmap since using
> kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
> a "struct page".
>
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> ---
> v1 -> v2:
> - Do not change the lifecycle of the mapping (pbonzini)
> ---
> arch/x86/kvm/vmx.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index d857401..5b15ca2 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -847,6 +847,9 @@ struct nested_vmx {
> struct page *apic_access_page;
> struct page *virtual_apic_page;
> struct page *pi_desc_page;
> +
> + struct kvm_host_map msr_bitmap_map;
> +
> struct pi_desc *pi_desc;
> bool pi_pending;
> u16 posted_intr_nv;
> @@ -11546,9 +11549,10 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
> struct vmcs12 *vmcs12)
> {
> int msr;
> - struct page *page;
> unsigned long *msr_bitmap_l1;
> unsigned long *msr_bitmap_l0 = to_vmx(vcpu)->nested.vmcs02.msr_bitmap;
> + struct kvm_host_map *map = &to_vmx(vcpu)->nested.msr_bitmap_map;
> +
> /*
> * pred_cmd & spec_ctrl are trying to verify two things:
> *
> @@ -11574,11 +11578,10 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
> !pred_cmd && !spec_ctrl)
> return false;
>
> - page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->msr_bitmap);
> - if (is_error_page(page))
> + if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->msr_bitmap), map))
Isn't this the sort of high frequency operation that should not use the new API?
> return false;
>
> - msr_bitmap_l1 = (unsigned long *)kmap(page);
> + msr_bitmap_l1 = (unsigned long *)map->hva;
> if (nested_cpu_has_apic_reg_virt(vmcs12)) {
> /*
> * L0 need not intercept reads for MSRs between 0x800 and 0x8ff, it
> @@ -11626,8 +11629,7 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
> MSR_IA32_PRED_CMD,
> MSR_TYPE_W);
>
> - kunmap(page);
> - kvm_release_page_clean(page);
> + kvm_vcpu_unmap(&to_vmx(vcpu)->nested.msr_bitmap_map);
>
> return true;
> }
> --
> 2.7.4
>
next prev parent reply other threads:[~2018-10-22 21:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-20 22:22 [PATCH v3 00/13] KVM/X86: Introduce a new guest mapping interface KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 01/13] X86/nVMX: handle_vmon: Read 4 bytes from guest memory KarimAllah Ahmed
2018-10-22 17:17 ` Jim Mattson
2018-10-20 22:22 ` [PATCH v3 02/13] X86/nVMX: handle_vmptrld: Copy the VMCS12 directly " KarimAllah Ahmed
2018-10-22 21:32 ` Jim Mattson
2018-10-20 22:22 ` [PATCH v3 03/13] X86/nVMX: Update the PML table without mapping and unmapping the page KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 04/13] X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 05/13] KVM: Introduce a new guest mapping API KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 06/13] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap KarimAllah Ahmed
2018-10-22 21:42 ` Jim Mattson [this message]
2018-10-22 21:49 ` Raslan, KarimAllah
2018-10-20 22:22 ` [PATCH v3 07/13] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page KarimAllah Ahmed
2018-10-21 7:39 ` [RESEND PATCH " KarimAllah Ahmed
2018-10-21 8:09 ` [PATCH " Raslan, KarimAllah
2018-10-20 22:22 ` [PATCH v3 08/13] KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt descriptor table KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 09/13] KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 10/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_clear_sint_msg_pending KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 11/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 12/13] KVM/nSVM: Use the new mapping API for mapping guest memory KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 13/13] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS KarimAllah Ahmed
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='CALMp9eRh2syfY9KjaH9h=AA1dwRnKb+S-NXEB3Hn+tjQoSrBXg@mail.gmail.com' \
--to=jmattson@google.com \
--cc=karahmed@amazon.de \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=rkrcmar@redhat.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).