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KVM: x86/xen: ignore the VCPU_SSHOTTMR_future flag

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Upstream Xen now ignores _VCPU_SSHOTTMR_future[1], since the only guest
kernel ever to use it was buggy. By ignoring the flag the guest will
always get a callback if it sets a negative timeout which upstream Xen
has determined not to cause problems for any guest setting the flag.

[1] https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=19c6cbd909

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20231004174628.2073263-1-paul@xen.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Paul Durrant 2023-10-04 17:46:28 +00:00 committed by Sean Christopherson
parent 77c9b9dea4
commit 409f2e92a2
1 changed files with 1 additions and 5 deletions
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6
arch/x86/kvm/xen.c
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@ -1423,12 +1423,8 @@ static bool kvm_xen_hcall_vcpu_op(struct kvm_vcpu *vcpu, bool longmode, int cmd,
return true;
}
/* A delta <= 0 results in an immediate callback, which is what we want */
delta = oneshot.timeout_abs_ns - get_kvmclock_ns(vcpu->kvm);
if ((oneshot.flags & VCPU_SSHOTTMR_future) && delta < 0) {
*r = -ETIME;
return true;
}
kvm_xen_start_timer(vcpu, oneshot.timeout_abs_ns, delta);
*r = 0;
return true;