From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: KarimAllah Ahmed <karahmed@amazon.de>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
pbonzini@redhat.com, rkrcmar@redhat.com
Subject: Re: [PATCH v5 01/13] X86/nVMX: handle_vmon: Read 4 bytes from guest memory
Date: Wed, 23 Jan 2019 11:59:45 -0500 [thread overview]
Message-ID: <20190123165932.GF19289@Konrads-MacBook-Pro.local> (raw)
In-Reply-To: <1547026933-31226-2-git-send-email-karahmed@amazon.de>
On Wed, Jan 09, 2019 at 10:42:01AM +0100, KarimAllah Ahmed wrote:
> Read the data directly from guest memory instead of the map->read->unmap
> sequence. This also avoids using kvm_vcpu_gpa_to_page() and kmap() which
> assumes that there is a "struct page" for guest memory.
>
> Suggested-by: Jim Mattson <jmattson@google.com>
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> Reviewed-by: Jim Mattson <jmattson@google.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
Mind if I join party?
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
>
> ---
> v1 -> v2:
> - Massage commit message a bit.
> ---
> arch/x86/kvm/vmx/nested.c | 14 +++-----------
> 1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 3170e29..536468a 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -4192,7 +4192,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
> {
> int ret;
> gpa_t vmptr;
> - struct page *page;
> + uint32_t revision;
> struct vcpu_vmx *vmx = to_vmx(vcpu);
> const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED
> | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
> @@ -4241,18 +4241,10 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
> if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
> return nested_vmx_failInvalid(vcpu);
>
> - page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
> - if (is_error_page(page))
> + if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) ||
> + revision != VMCS12_REVISION)
> return nested_vmx_failInvalid(vcpu);
>
> - if (*(u32 *)kmap(page) != VMCS12_REVISION) {
> - kunmap(page);
> - kvm_release_page_clean(page);
> - return nested_vmx_failInvalid(vcpu);
> - }
> - kunmap(page);
> - kvm_release_page_clean(page);
> -
> vmx->nested.vmxon_ptr = vmptr;
> ret = enter_vmx_operation(vcpu);
> if (ret)
> --
> 2.7.4
>
next prev parent reply other threads:[~2019-01-23 17:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 9:42 [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface KarimAllah Ahmed
2019-01-09 9:42 ` [PATCH v5 01/13] X86/nVMX: handle_vmon: Read 4 bytes from guest memory KarimAllah Ahmed
2019-01-23 16:59 ` Konrad Rzeszutek Wilk [this message]
2019-01-09 9:42 ` [PATCH v5 02/13] X86/nVMX: Update the PML table without mapping and unmapping the page KarimAllah Ahmed
2019-01-23 17:17 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 03/13] X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs KarimAllah Ahmed
2019-01-23 17:31 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 04/13] KVM: Introduce a new guest mapping API KarimAllah Ahmed
2019-01-10 13:07 ` David Hildenbrand
2019-01-25 18:01 ` Raslan, KarimAllah
2019-01-23 17:41 ` Konrad Rzeszutek Wilk
2019-01-23 17:50 ` Konrad Rzeszutek Wilk
2019-01-25 18:09 ` Raslan, KarimAllah
2019-01-30 17:08 ` Paolo Bonzini
2019-01-09 9:42 ` [PATCH v5 05/13] X86/nVMX: handle_vmptrld: Use kvm_vcpu_map when copying VMCS12 from guest memory KarimAllah Ahmed
2019-01-23 17:44 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 06/13] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap KarimAllah Ahmed
2019-01-09 9:42 ` [PATCH v5 07/13] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page KarimAllah Ahmed
2019-01-23 17:57 ` Konrad Rzeszutek Wilk
2019-01-25 18:14 ` Raslan, KarimAllah
2019-01-09 9:42 ` [PATCH v5 08/13] KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt descriptor table KarimAllah Ahmed
2019-01-23 18:03 ` Konrad Rzeszutek Wilk
2019-01-25 18:15 ` Raslan, KarimAllah
2019-01-09 9:42 ` [PATCH v5 09/13] KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated KarimAllah Ahmed
2019-01-23 18:04 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 10/13] KVM/nSVM: Use the new mapping API for mapping guest memory KarimAllah Ahmed
2019-01-23 18:08 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 11/13] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS KarimAllah Ahmed
2019-01-23 18:10 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 12/13] KVM/nVMX: Use kvm_vcpu_map for accessing the enlightened VMCS KarimAllah Ahmed
2019-01-23 18:11 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 13/13] KVM/nVMX: Use page_address_valid in a few more locations KarimAllah Ahmed
2019-01-23 18:18 ` Konrad Rzeszutek Wilk
2019-01-25 18:17 ` Raslan, KarimAllah
2019-01-23 18:16 ` [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface Konrad Rzeszutek Wilk
2019-01-25 18:28 ` Raslan, KarimAllah
2019-01-30 17:14 ` Paolo Bonzini
2019-01-31 13:03 ` Raslan, KarimAllah
2019-01-31 13:10 ` 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=20190123165932.GF19289@Konrads-MacBook-Pro.local \
--to=konrad.wilk@oracle.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).