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[PATCH v7 0/9] i386: KVM: expand Hyper-V features early
From: |
Vitaly Kuznetsov |
Subject: |
[PATCH v7 0/9] i386: KVM: expand Hyper-V features early |
Date: |
Thu, 3 Jun 2021 13:48:26 +0200 |
Changes since v6 [Eduardo]:
- First 14 patches of v6 made it upstream!
- New patches addressing feedback on the already merged patches added:
i386: make hyperv_expand_features() return bool
i386: hardcode supported eVMCS version to '1'
i386: clarify 'hv-passthrough' behavior
i386: avoid hardcoding '12' as 'hyperv_vendor_id' length
- Some comments expanded.
- HV_HYPERCALL_AVAILABLE setting moved to hyperv_fill_cpuids()
Note: Windows guest on QEMU are currently completely broken, see Claudio's
https://lore.kernel.org/kvm/20210529091313.16708-1-cfontana@suse.de/
The last two functional patches are inspired by 'Fine-grained access check
to Hyper-V hypercalls and MSRs' work for KVM:
https://lore.kernel.org/kvm/20210521095204.2161214-1-vkuznets@redhat.com/
Original description:
Upper layer tools like libvirt want to figure out which Hyper-V features are
supported by the underlying stack (QEMU/KVM) but currently they are unable to
do so. We have a nice 'hv_passthrough' CPU flag supported by QEMU but it has
no effect on e.g. QMP's
query-cpu-model-expansion type=full
model={"name":"host","props":{"hv-passthrough":true}}
command as we parse Hyper-V features after creating KVM vCPUs and not at
feature expansion time. To support the use-case we first need to make
KVM_GET_SUPPORTED_HV_CPUID ioctl a system-wide ioctl as the existing
vCPU version can't be used that early. This is what KVM part does. With
that done, we can make early Hyper-V feature expansion (this series).
Vitaly Kuznetsov (9):
i386: avoid hardcoding '12' as 'hyperv_vendor_id' length
i386: clarify 'hv-passthrough' behavior
i386: hardcode supported eVMCS version to '1'
i386: make hyperv_expand_features() return bool
i386: expand Hyper-V features during CPU feature expansion time
i386: kill off hv_cpuid_check_and_set()
i386: HV_HYPERCALL_AVAILABLE privilege bit is always needed
i386: Hyper-V SynIC requires POST_MESSAGES/SIGNAL_EVENTS priviliges
qtest/hyperv: Introduce a simple hyper-v test
MAINTAINERS | 1 +
docs/hyperv.txt | 9 +-
target/i386/cpu.c | 13 +-
target/i386/kvm/hyperv-proto.h | 6 +
target/i386/kvm/kvm-stub.c | 5 +
target/i386/kvm/kvm.c | 166 ++++++++++++------------
target/i386/kvm/kvm_i386.h | 1 +
tests/qtest/hyperv-test.c | 225 +++++++++++++++++++++++++++++++++
tests/qtest/meson.build | 3 +-
9 files changed, 337 insertions(+), 92 deletions(-)
create mode 100644 tests/qtest/hyperv-test.c
--
2.31.1
- [PATCH v7 0/9] i386: KVM: expand Hyper-V features early,
Vitaly Kuznetsov <=
[PATCH v7 2/9] i386: clarify 'hv-passthrough' behavior, Vitaly Kuznetsov, 2021/06/03
[PATCH v7 4/9] i386: make hyperv_expand_features() return bool, Vitaly Kuznetsov, 2021/06/03