[PATCH 0/3] KVM: x86: replace kvm_vcpu_map usage in vmx

David Stevens
2023-01-27T04:45:23Z

From: David Stevens <stevensd@chromium.org>

This series replaces the usage of kvm_vcpu_map in vmx with
gfn_to_pfn_cache. See [1] for details on why kvm_vcpu_map is broken.

The presence of kvm_vcpu_map blocks another series I would like to
try to merge [2]. Although I'm not familiar with the internals of vmx,
I've gone ahead and taken a stab at this cleanup. I've done some manual
testing with nested VMs, and KVM selftests pass, but thorough feedback
would be appreciated. Once this cleanup is done, I'll take a look at
removing kvm_vcpu_map from svm.

[1] https://lore.kernel.org/all/20211115165030.7422-8-dwmw2@infradead.org/
[2] https://lore.kernel.org/all/Ydhq5aHW+JFo15UF@google.com/

David Stevens (3):
KVM: Support sharing gpc locks
KVM: use gfn=>pfn cache in nested_get_vmcs12_pages
KVM: use gfn=>pfn cache for evmcs

arch/x86/kvm/vmx/hyperv.c | 41 ++++-
arch/x86/kvm/vmx/hyperv.h | 2 +
arch/x86/kvm/vmx/nested.c | 329 +++++++++++++++++++++++++++++---------
arch/x86/kvm/vmx/vmx.c | 48 +++++-
arch/x86/kvm/vmx/vmx.h | 14 +-
arch/x86/kvm/x86.c | 8 +-
arch/x86/kvm/xen.c | 58 +++----
include/linux/kvm_host.h | 12 ++
include/linux/kvm_types.h | 3 +-
virt/kvm/pfncache.c | 37 +++--
10 files changed, 418 insertions(+), 134 deletions(-)

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2.39.1.456.gfc5497dd1b-goog