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From: Paolo Bonzini <pbonzini@redhat.com>
To: Ashish Kalra <ashish.kalra@amd.com>
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
	joro@8bytes.org, bp@suse.de, Thomas.Lendacky@amd.com,
	x86@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, srutherford@google.com,
	rientjes@google.com, venu.busireddy@oracle.com,
	brijesh.singh@amd.com
Subject: Re: [PATCH v8 12/18] KVM: SVM: Add support for static allocation of unified Page Encryption Bitmap.
Date: Sun, 6 Dec 2020 11:19:21 +0100	[thread overview]
Message-ID: <4e60a01d-dfc8-bc4f-e3d2-628d69f370fa@redhat.com> (raw)
In-Reply-To: <20201204213852.GA1424@ashkalra_ubuntu_server>

On 04/12/20 22:38, Ashish Kalra wrote:
> Earlier we used to dynamic resizing of the page encryption bitmap based
> on the guest hypercall, but potentially a malicious guest can make a hypercall
> which can trigger a really large memory allocation on the host side and may
> eventually cause denial of service.
> 
> Hence now we don't do dynamic resizing of the page encryption bitmap as
> per the hypercall and allocate it statically based on guest memory
> allocation by walking through memslots and computing it's size.
> 
> I will add the above comment to the fresh series of the patch-set i am
> going to post.

Sounds good, thanks.  If there are no other changes I can include this 
in the commit message myself.

Paolo


  reply	other threads:[~2020-12-06 10:20 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-05 21:13 [PATCH v8 00/18] Add AMD SEV guest live migration support Ashish Kalra
2020-05-05 21:14 ` [PATCH v8 01/18] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra
2020-05-05 21:14 ` [PATCH v8 02/18] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra
2020-05-05 22:48   ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 03/18] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra
2020-05-05 22:51   ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 04/18] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra
2020-05-05 22:52   ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 05/18] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra
2020-05-05 21:16 ` [PATCH v8 06/18] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra
2020-05-05 21:16 ` [PATCH v8 07/18] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra
2020-05-05 21:17 ` [PATCH v8 08/18] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Ashish Kalra
2020-05-30  2:05   ` Steve Rutherford
2020-05-05 21:17 ` [PATCH v8 09/18] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-05-30  2:05   ` Steve Rutherford
2020-05-05 21:17 ` [PATCH v8 10/18] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra
2020-05-30  2:06   ` Steve Rutherford
2020-05-05 21:18 ` [PATCH v8 11/18] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-05-30  2:06   ` Steve Rutherford
2020-05-05 21:18 ` [PATCH v8 12/18] KVM: SVM: Add support for static allocation of unified Page Encryption Bitmap Ashish Kalra
2020-05-30  2:07   ` Steve Rutherford
2020-05-30  5:49     ` Ashish Kalra
2020-12-04 11:08   ` Paolo Bonzini
2020-12-04 21:38     ` Ashish Kalra
2020-12-06 10:19       ` Paolo Bonzini [this message]
2020-05-05 21:19 ` [PATCH v8 13/18] KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & Custom MSR Ashish Kalra
2020-05-30  2:07   ` Steve Rutherford
2020-12-04 11:20   ` Paolo Bonzini
2020-12-04 16:48     ` Sean Christopherson
2020-12-04 17:08       ` Ashish Kalra
2020-12-04 17:23         ` Sean Christopherson
2020-12-06 10:57           ` Paolo Bonzini
2020-12-06 14:09             ` Kalra, Ashish
2020-12-04 18:06       ` Ashish Kalra
2020-12-04 18:41         ` Sean Christopherson
2020-12-04 18:48           ` Kalra, Ashish
2020-12-04 19:02           ` Tom Lendacky
2020-12-04 21:42     ` Ashish Kalra
2020-05-05 21:20 ` [PATCH v8 14/18] EFI: Introduce the new AMD Memory Encryption GUID Ashish Kalra
2020-05-30  2:07   ` Steve Rutherford
2020-05-30  5:51     ` Ashish Kalra
2020-05-05 21:20 ` [PATCH v8 15/18] KVM: x86: Add guest support for detecting and enabling SEV Live Migration feature Ashish Kalra
2020-05-30  2:08   ` Steve Rutherford
2020-05-05 21:20 ` [PATCH v8 16/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap Ashish Kalra
2020-05-30  2:08   ` Steve Rutherford
2020-05-05 21:21 ` [PATCH v8 17/18] KVM: x86: Add kexec support for SEV Live Migration Ashish Kalra
2020-05-30  2:08   ` Steve Rutherford
2020-05-05 21:22 ` [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s) Ashish Kalra
2020-05-30  2:09   ` Steve Rutherford
2020-12-04 11:11   ` Paolo Bonzini
2020-12-04 11:22   ` Paolo Bonzini
2020-12-04 21:46     ` Ashish Kalra
2020-12-06 10:18       ` Paolo Bonzini
2020-05-18 19:07 ` [PATCH v8 00/18] Add AMD SEV guest live migration support Ashish Kalra
2020-06-01 20:02   ` Steve Rutherford
2020-06-03 22:14     ` Ashish Kalra
2020-08-05 18:29       ` Steve Rutherford

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