From: Paul Durrant <paul@xen.org>
To: David Woodhouse <dwmw2@infradead.org>,
Paul Durrant <paul@xen.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v8 00/15] KVM: xen: update shared_info and vcpu_info handling
Date: Tue, 21 Nov 2023 18:02:08 +0000 [thread overview]
Message-ID: <20231121180223.12484-1-paul@xen.org> (raw)
From: Paul Durrant <pdurrant@amazon.com>
Currently the shared_info page is treated as guest memory and the VMM
informs KVM of its location using a GFN. However it is not guest memory as
such; it's an overlay page. So the pfncache is pointlessly invalidated and
re-activated to create a new mapping of the *same page* of memory every
time the guest requests that shared_info be mapped into its address space.
Avoid doing that by modifying the pfncache code to allow activation using
a fixed userspace HVA as well as a GPA.
Version 8 of the series has been substantially re-worked and includes
several clean-up patches, particlarly the non-trivial clean-up patches:
"pfncache: remove KVM_GUEST_USES_PFN usage" and "xen: split up
kvm_xen_set_evtchn_fast()". Each patch carries its own version history.
Paul Durrant (15):
KVM: pfncache: Add a map helper function
KVM: pfncache: remove unnecessary exports
KVM: xen: mark guest pages dirty with the pfncache lock held
KVM: pfncache: add a mark-dirty helper
KVM: pfncache: remove KVM_GUEST_USES_PFN usage
KVM: pfncache: stop open-coding offset_in_page()
KVM: pfncache: include page offset in uhva and use it consistently
KVM: pfncache: allow a cache to be activated with a fixed (userspace)
HVA
KVM: xen: allow shared_info to be mapped by fixed HVA
KVM: xen: allow vcpu_info to be mapped by fixed HVA
KVM: selftests / xen: map shared_info using HVA rather than GFN
KVM: selftests / xen: re-map vcpu_info using HVA rather than GPA
KVM: xen: advertize the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA capability
KVM: xen: split up kvm_xen_set_evtchn_fast()
KVM: xen: allow vcpu_info content to be 'safely' copied
Documentation/virt/kvm/api.rst | 53 +++-
arch/x86/kvm/x86.c | 7 +-
arch/x86/kvm/xen.c | 260 +++++++++++-------
include/linux/kvm_host.h | 38 ++-
include/linux/kvm_types.h | 8 -
include/uapi/linux/kvm.h | 9 +-
.../selftests/kvm/x86_64/xen_shinfo_test.c | 59 +++-
virt/kvm/pfncache.c | 175 ++++++------
8 files changed, 374 insertions(+), 235 deletions(-)
base-commit: 45b890f7689eb0aba454fc5831d2d79763781677
---
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
--
2.39.2
next reply other threads:[~2023-11-21 18:03 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-21 18:02 Paul Durrant [this message]
2023-11-21 18:02 ` [PATCH v8 01/15] KVM: pfncache: Add a map helper function Paul Durrant
2023-11-21 18:02 ` [PATCH v8 02/15] KVM: pfncache: remove unnecessary exports Paul Durrant
2023-11-21 21:49 ` David Woodhouse
2023-11-22 8:44 ` Paul Durrant
2023-11-21 18:02 ` [PATCH v8 03/15] KVM: xen: mark guest pages dirty with the pfncache lock held Paul Durrant
2023-11-21 21:49 ` David Woodhouse
2023-11-21 18:02 ` [PATCH v8 04/15] KVM: pfncache: add a mark-dirty helper Paul Durrant
2023-11-21 18:02 ` [PATCH v8 05/15] KVM: pfncache: remove KVM_GUEST_USES_PFN usage Paul Durrant
2023-11-21 22:24 ` David Woodhouse
2023-11-27 23:36 ` Sean Christopherson
2023-11-21 18:02 ` [PATCH v8 06/15] KVM: pfncache: stop open-coding offset_in_page() Paul Durrant
2023-11-21 22:26 ` David Woodhouse
2023-11-21 18:02 ` [PATCH v8 07/15] KVM: pfncache: include page offset in uhva and use it consistently Paul Durrant
2023-11-21 22:35 ` David Woodhouse
2023-11-22 9:29 ` Paul Durrant
2023-11-22 8:54 ` Xu Yilun
2023-11-22 9:12 ` David Woodhouse
2023-11-22 14:27 ` Xu Yilun
2023-11-22 15:42 ` David Woodhouse
2023-11-22 15:52 ` Paul Durrant
2023-11-21 18:02 ` [PATCH v8 08/15] KVM: pfncache: allow a cache to be activated with a fixed (userspace) HVA Paul Durrant
2023-11-21 22:47 ` David Woodhouse
2023-11-22 10:07 ` Paul Durrant
2023-11-21 18:02 ` [PATCH v8 09/15] KVM: xen: allow shared_info to be mapped by fixed HVA Paul Durrant
2023-11-21 18:02 ` [PATCH v8 10/15] KVM: xen: allow vcpu_info " Paul Durrant
2023-11-21 18:02 ` [PATCH v8 11/15] KVM: selftests / xen: map shared_info using HVA rather than GFN Paul Durrant
2023-11-21 18:02 ` [PATCH v8 12/15] KVM: selftests / xen: re-map vcpu_info using HVA rather than GPA Paul Durrant
2023-11-21 18:02 ` [PATCH v8 13/15] KVM: xen: advertize the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA capability Paul Durrant
2023-11-21 18:02 ` [PATCH v8 14/15] KVM: xen: split up kvm_xen_set_evtchn_fast() Paul Durrant
2023-11-21 22:49 ` David Woodhouse
2023-11-21 18:02 ` [PATCH v8 15/15] KVM: xen: allow vcpu_info content to be 'safely' copied Paul Durrant
2023-11-21 22:53 ` David Woodhouse
2023-11-22 10:39 ` David Woodhouse
2023-11-22 10:55 ` Paul Durrant
2023-11-22 11:25 ` David Woodhouse
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