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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2022-03-03 15:41:26 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 05:41:17 -0400 |
| commit | 1a65105a5aba9f7c6ea68cf687e569d055a94685 (patch) | |
| tree | 1567c60b602208d83bd54d4c8899fe83590615f7 /tools/testing/selftests/kvm/x86_64 | |
| parent | 661a20fab7d156cf6b9a407c946a1e558a633151 (diff) | |
| download | linux-1a65105a5aba9f7c6ea68cf687e569d055a94685.tar.bz2 | |
KVM: x86/xen: handle PV spinlocks slowpath
Add support for SCHEDOP_poll hypercall.
This implementation is optimized for polling for a single channel, which
is what Linux does. Polling for multiple channels is not especially
efficient (and has not been tested).
PV spinlocks slow path uses this hypercall, and explicitly crash if it's
not supported.
[ dwmw2: Rework to use kvm_vcpu_halt(), not supported for 32-bit guests ]
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-17-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c index 865e17146815..376c611443cd 100644 --- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c @@ -233,6 +233,12 @@ int main(int argc, char *argv[]) .flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL, .msr = XEN_HYPERCALL_MSR, }; + + /* Let the kernel know that we *will* use it for sending all + * event channels, which lets it intercept SCHEDOP_poll */ + if (xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND) + hvmc.flags |= KVM_XEN_HVM_CONFIG_EVTCHN_SEND; + vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc); struct kvm_xen_hvm_attr lm = { |