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From: Paul Mackerras <paulus@ozlabs.org>
To: Bharata B Rao <bharata@linux.ibm.com>
Cc: linuxram@us.ibm.com, cclaudio@linux.ibm.com,
	kvm-ppc@vger.kernel.org, linux-mm@kvack.org, jglisse@redhat.com,
	aneesh.kumar@linux.vnet.ibm.com, paulus@au1.ibm.com,
	sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
	hch@lst.de
Subject: Re: [PATCH v10 2/8] KVM: PPC: Support for running secure guests
Date: Wed, 6 Nov 2019 15:34:57 +1100
Message-ID: <20191106043457.GC12069@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <20191104041800.24527-3-bharata@linux.ibm.com>

On Mon, Nov 04, 2019 at 09:47:54AM +0530, Bharata B Rao wrote:
> A pseries guest can be run as secure guest on Ultravisor-enabled
> POWER platforms. On such platforms, this driver will be used to manage
> the movement of guest pages between the normal memory managed by
> hypervisor (HV) and secure memory managed by Ultravisor (UV).
> 
> HV is informed about the guest's transition to secure mode via hcalls:
> 
> H_SVM_INIT_START: Initiate securing a VM
> H_SVM_INIT_DONE: Conclude securing a VM
> 
> As part of H_SVM_INIT_START, register all existing memslots with
> the UV. H_SVM_INIT_DONE call by UV informs HV that transition of
> the guest to secure mode is complete.
> 
> These two states (transition to secure mode STARTED and transition
> to secure mode COMPLETED) are recorded in kvm->arch.secure_guest.
> Setting these states will cause the assembly code that enters the
> guest to call the UV_RETURN ucall instead of trying to enter the
> guest directly.
> 
> Migration of pages betwen normal and secure memory of secure
> guest is implemented in H_SVM_PAGE_IN and H_SVM_PAGE_OUT hcalls.
> 
> H_SVM_PAGE_IN: Move the content of a normal page to secure page
> H_SVM_PAGE_OUT: Move the content of a secure page to normal page
> 
> Private ZONE_DEVICE memory equal to the amount of secure memory
> available in the platform for running secure guests is created.
> Whenever a page belonging to the guest becomes secure, a page from
> this private device memory is used to represent and track that secure
> page on the HV side. The movement of pages between normal and secure
> memory is done via migrate_vma_pages() using UV_PAGE_IN and
> UV_PAGE_OUT ucalls.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>

Reviewed-by: Paul Mackerras <paulus@ozlabs.org>

  reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04  4:17 [PATCH v10 0/8] KVM: PPC: Driver to manage pages of secure guest Bharata B Rao
2019-11-04  4:17 ` [PATCH v10 1/8] mm: ksm: Export ksm_madvise() Bharata B Rao
2019-11-06  4:33   ` Paul Mackerras
2019-11-06  6:45     ` Bharata B Rao
2019-11-07  5:45       ` Paul Mackerras
2019-11-15 14:10         ` Bharata B Rao
2019-11-04  4:17 ` [PATCH v10 2/8] KVM: PPC: Support for running secure guests Bharata B Rao
2019-11-06  4:34   ` Paul Mackerras [this message]
2019-11-04  4:17 ` [PATCH v10 3/8] KVM: PPC: Shared pages support for " Bharata B Rao
2019-11-06  4:52   ` Paul Mackerras
2019-11-06  8:22     ` Bharata B Rao
2019-11-06  8:29       ` Bharata B Rao
2019-11-04  4:17 ` [PATCH v10 4/8] KVM: PPC: Radix changes for secure guest Bharata B Rao
2019-11-06  5:58   ` Paul Mackerras
2019-11-06  8:36     ` Bharata B Rao
2019-11-04  4:17 ` [PATCH v10 5/8] KVM: PPC: Handle memory plug/unplug to secure VM Bharata B Rao
2019-11-11  4:25   ` Paul Mackerras
2019-11-04  4:17 ` [PATCH v10 6/8] KVM: PPC: Support reset of secure guest Bharata B Rao
2019-11-11  5:28   ` Paul Mackerras
2019-11-11  6:55     ` Bharata B Rao
2019-11-12  5:34   ` Paul Mackerras
2019-11-13 15:29     ` Bharata B Rao
2019-11-14  5:07       ` Paul Mackerras
2019-11-04  4:17 ` [PATCH v10 7/8] KVM: PPC: Implement H_SVM_INIT_ABORT hcall Bharata B Rao
2019-11-11  4:19   ` Paul Mackerras
2019-11-12  1:01     ` Ram Pai
2019-11-12  5:38       ` Paul Mackerras
2019-11-12  7:52         ` Ram Pai
2019-11-12 11:32           ` Paul Mackerras
2019-11-12 14:45             ` Ram Pai
2019-11-13  0:14               ` Paul Mackerras
2019-11-13  6:32                 ` Ram Pai
2019-11-13 21:18                   ` Paul Mackerras
2019-11-13 21:50                     ` Ram Pai
2019-11-14  5:08                       ` Paul Mackerras
2019-11-14  7:02                         ` Ram Pai
2019-11-04  4:18 ` [PATCH v10 8/8] KVM: PPC: Ultravisor: Add PPC_UV config option Bharata B Rao
2019-11-06  4:30 ` [PATCH v10 0/8] KVM: PPC: Driver to manage pages of secure guest Paul Mackerras
2019-11-06  6:20   ` Bharata B Rao

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