From: Sean Christopherson <seanjc@google.com>
To: Maxim Levitsky <mlevitsk@redhat.com>
Cc: kvm@vger.kernel.org,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jonathan Corbet <corbet@lwn.net>,
Paolo Bonzini <pbonzini@redhat.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Wanpeng Li <wanpengli@tencent.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v2 0/6] Introduce KVM_{GET|SET}_SREGS2 and fix PDPTR migration
Date: Wed, 26 May 2021 18:01:05 +0000 [thread overview]
Message-ID: <YK6M4UwNGn1Gc5Sa@google.com> (raw)
In-Reply-To: <20210426111333.967729-1-mlevitsk@redhat.com>
On Mon, Apr 26, 2021, Maxim Levitsky wrote:
> This patch set aims to fix few flaws that were discovered
> in KVM_{GET|SET}_SREGS on x86:
>
> * There is no support for reading/writing PDPTRs although
> these are considered to be part of the guest state.
>
> * There is useless interrupt bitmap which isn't needed
>
> * No support for future extensions (via flags and such)
>
> Also if the user doesn't use the new SREG2 api, the PDPTR
> load after migration is now done on KVM_REQ_GET_NESTED_STATE_PAGES
> to at least read them correctly in cases when guest memory
> map is not up to date when nested state is loaded.
>
> This patch series was tested by doing nested migration test
> of 32 bit PAE L1 + 32 bit PAE L2 on AMD and Intel and by
> nested migration test of 64 bit L1 + 32 bit PAE L2 on AMD.
> The later test currently fails on Intel (regardless of my patches).
>
> Changes from V1:
> - move only PDPTRS load to KVM_REQ_GET_NESTED_STATE_PAGES on VMX
> - rebase on top of kvm/queue
> - improve the KVM_GET_SREGS2 to have flag for PDPTRS
> and remove padding
>
> Patches to qemu will be send soon as well.
How did you want to handle integration with the removal of pdptrs_changed()?
https://lkml.kernel.org/r/68ff1249-2902-43d5-3dfd-35b1f14c4f90@redhat.com
next prev parent reply other threads:[~2021-05-26 18:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-26 11:13 [PATCH v2 0/6] Introduce KVM_{GET|SET}_SREGS2 and fix PDPTR migration Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 1/6] KVM: nSVM: refactor the CR3 reload on migration Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 2/6] KVM: nVMX: delay loading of PDPTRs to KVM_REQ_GET_NESTED_STATE_PAGES Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 3/6] KVM: x86: introduce kvm_register_clear_available Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 4/6] KVM: x86: Introduce KVM_GET_SREGS2 / KVM_SET_SREGS2 Maxim Levitsky
2021-04-26 12:32 ` Paolo Bonzini
2021-04-26 12:56 ` Maxim Levitsky
2021-04-26 13:28 ` Paolo Bonzini
2021-04-26 13:31 ` Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 5/6] KVM: nSVM: avoid loading PDPTRs after migration when possible Maxim Levitsky
2021-04-26 11:13 ` [PATCH v2 6/6] KVM: nVMX: " Maxim Levitsky
2021-05-26 18:01 ` Sean Christopherson [this message]
2021-05-29 17:49 ` [PATCH v2 0/6] Introduce KVM_{GET|SET}_SREGS2 and fix PDPTR migration Maxim Levitsky
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