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Message-ID: <20200330182845.GA21740@ashkalra_ubuntu_server>
Date: Mon, 30 Mar 2020 18:28:45 +0000
From: Ashish Kalra <ashish.kalra@....com>
To: Venu Busireddy <venu.busireddy@...cle.com>
Cc: pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com,
hpa@...or.com, joro@...tes.org, bp@...e.de,
thomas.lendacky@....com, x86@...nel.org, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, rientjes@...gle.com,
srutherford@...gle.com, luto@...nel.org, brijesh.singh@....com
Subject: Re: [PATCH v6 00/14] Add AMD SEV guest live migration support
This is applied on top of Linux 5.6, as per commit below :
commit 7111951b8d4973bda27ff663f2cf18b663d15b48 (tag: v5.6, origin/master, origin/HEAD)
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Sun Mar 29 15:25:41 2020 -0700
Linux 5.6
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Thanks,
Ashish
On Mon, Mar 30, 2020 at 12:24:46PM -0500, Venu Busireddy wrote:
> On 2020-03-30 06:19:27 +0000, Ashish Kalra wrote:
> > From: Ashish Kalra <ashish.kalra@....com>
> >
> > The series add support for AMD SEV guest live migration commands. To protect the
> > confidentiality of an SEV protected guest memory while in transit we need to
> > use the SEV commands defined in SEV API spec [1].
> >
> > SEV guest VMs have the concept of private and shared memory. Private memory
> > is encrypted with the guest-specific key, while shared memory may be encrypted
> > with hypervisor key. The commands provided by the SEV FW are meant to be used
> > for the private memory only. The patch series introduces a new hypercall.
> > The guest OS can use this hypercall to notify the page encryption status.
> > If the page is encrypted with guest specific-key then we use SEV command during
> > the migration. If page is not encrypted then fallback to default.
> >
> > The patch adds new ioctls KVM_{SET,GET}_PAGE_ENC_BITMAP. The ioctl can be used
> > by the qemu to get the page encrypted bitmap. Qemu can consult this bitmap
> > during the migration to know whether the page is encrypted.
> >
> > [1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper.amd.com%2Fwp-content%2Fresources%2F55766.PDF&data=02%7C01%7CAshish.Kalra%40amd.com%7Cb87828d7e1eb41fe401c08d7d4cf4937%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637211859771455979&sdata=yN1OrvcuNb%2F8JAaLwlf2pIJtEvBRFOSvTKPYWz9ASUY%3D&reserved=0
> >
> > Changes since v5:
> > - Fix build errors as
> > Reported-by: kbuild test robot <lkp@...el.com>
>
> Which upstream tag should I use to apply this patch set? I tried the
> top of Linus's tree, and I get the following error when I apply this
> patch set.
>
> $ git am PATCH-v6-01-14-KVM-SVM-Add-KVM_SEV-SEND_START-command.mbox
> Applying: KVM: SVM: Add KVM_SEV SEND_START command
> Applying: KVM: SVM: Add KVM_SEND_UPDATE_DATA command
> Applying: KVM: SVM: Add KVM_SEV_SEND_FINISH command
> Applying: KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command
> error: patch failed: Documentation/virt/kvm/amd-memory-encryption.rst:375
> error: Documentation/virt/kvm/amd-memory-encryption.rst: patch does not apply
> error: patch failed: arch/x86/kvm/svm.c:7632
> error: arch/x86/kvm/svm.c: patch does not apply
> Patch failed at 0004 KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command
>
> Thanks,
>
> Venu
>
> >
> > Changes since v4:
> > - Host support has been added to extend KVM capabilities/feature bits to
> > include a new KVM_FEATURE_SEV_LIVE_MIGRATION, which the guest can
> > query for host-side support for SEV live migration and a new custom MSR
> > MSR_KVM_SEV_LIVE_MIG_EN is added for guest to enable the SEV live
> > migration feature.
> > - Ensure that _bss_decrypted section is marked as decrypted in the
> > page encryption bitmap.
> > - Fixing KVM_GET_PAGE_ENC_BITMAP ioctl to return the correct bitmap
> > as per the number of pages being requested by the user. Ensure that
> > we only copy bmap->num_pages bytes in the userspace buffer, if
> > bmap->num_pages is not byte aligned we read the trailing bits
> > from the userspace and copy those bits as is. This fixes guest
> > page(s) corruption issues observed after migration completion.
> > - Add kexec support for SEV Live Migration to reset the host's
> > page encryption bitmap related to kernel specific page encryption
> > status settings before we load a new kernel by kexec. We cannot
> > reset the complete page encryption bitmap here as we need to
> > retain the UEFI/OVMF firmware specific settings.
> >
> > Changes since v3:
> > - Rebasing to mainline and testing.
> > - Adding a new KVM_PAGE_ENC_BITMAP_RESET ioctl, which resets the
> > page encryption bitmap on a guest reboot event.
> > - Adding a more reliable sanity check for GPA range being passed to
> > the hypercall to ensure that guest MMIO ranges are also marked
> > in the page encryption bitmap.
> >
> > Changes since v2:
> > - reset the page encryption bitmap on vcpu reboot
> >
> > Changes since v1:
> > - Add support to share the page encryption between the source and target
> > machine.
> > - Fix review feedbacks from Tom Lendacky.
> > - Add check to limit the session blob length.
> > - Update KVM_GET_PAGE_ENC_BITMAP icotl to use the base_gfn instead of
> > the memory slot when querying the bitmap.
> >
> > Ashish Kalra (3):
> > KVM: x86: Introduce KVM_PAGE_ENC_BITMAP_RESET ioctl
> > KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature &
> > Custom MSR.
> > KVM: x86: Add kexec support for SEV Live Migration.
> >
> > Brijesh Singh (11):
> > KVM: SVM: Add KVM_SEV SEND_START command
> > KVM: SVM: Add KVM_SEND_UPDATE_DATA command
> > KVM: SVM: Add KVM_SEV_SEND_FINISH command
> > KVM: SVM: Add support for KVM_SEV_RECEIVE_START command
> > KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command
> > KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command
> > KVM: x86: Add AMD SEV specific Hypercall3
> > KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall
> > KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl
> > mm: x86: Invoke hypercall when page encryption status is changed
> > KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl
> >
> > .../virt/kvm/amd-memory-encryption.rst | 120 +++
> > Documentation/virt/kvm/api.rst | 62 ++
> > Documentation/virt/kvm/cpuid.rst | 4 +
> > Documentation/virt/kvm/hypercalls.rst | 15 +
> > Documentation/virt/kvm/msr.rst | 10 +
> > arch/x86/include/asm/kvm_host.h | 10 +
> > arch/x86/include/asm/kvm_para.h | 12 +
> > arch/x86/include/asm/paravirt.h | 10 +
> > arch/x86/include/asm/paravirt_types.h | 2 +
> > arch/x86/include/uapi/asm/kvm_para.h | 5 +
> > arch/x86/kernel/kvm.c | 32 +
> > arch/x86/kernel/paravirt.c | 1 +
> > arch/x86/kvm/cpuid.c | 3 +-
> > arch/x86/kvm/svm.c | 699 +++++++++++++++++-
> > arch/x86/kvm/vmx/vmx.c | 1 +
> > arch/x86/kvm/x86.c | 43 ++
> > arch/x86/mm/mem_encrypt.c | 69 +-
> > arch/x86/mm/pat/set_memory.c | 7 +
> > include/linux/psp-sev.h | 8 +-
> > include/uapi/linux/kvm.h | 53 ++
> > include/uapi/linux/kvm_para.h | 1 +
> > 21 files changed, 1157 insertions(+), 10 deletions(-)
> >
> > --
> > 2.17.1
> >
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