From: bugzilla-daemon@bugzilla.kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 204209] kernel 5.2.1: "floating point exception" in qemu with kvm enabled
Date: Fri, 19 Jul 2019 20:46:38 +0000 [thread overview]
Message-ID: <bug-204209-28872-MIBnXnwk9l@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-204209-28872@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=204209
--- Comment #2 from anthony (antdev66@gmail.com) ---
I tested the patch indicated on https://lkml.org/lkml/2019/7/19/644 with simple
row position adjustments for the kernel 5.2.1 and it seems to work.
--- a/arch/x86/kvm/x86.c 2019-07-19 20:17:35.358848175 +0200
+++ b/arch/x86/kvm/x86.c 2019-07-19 20:17:17.956692942 +0200
@@ -3264,6 +3264,12 @@
kvm_x86_ops->vcpu_load(vcpu, cpu);
+
+ // fix floating point error kvm guest
+ if (test_thread_flag(TIF_NEED_FPU_LOAD))
+ switch_fpu_return();
+
+
/* Apply any externally detected TSC adjustments (due to suspend) */
if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
@@ -7955,9 +7961,11 @@
wait_lapic_expire(vcpu);
guest_enter_irqoff();
- fpregs_assert_state_consistent();
- if (test_thread_flag(TIF_NEED_FPU_LOAD))
- switch_fpu_return();
+// fix floating point error kvm guest
+//
+// fpregs_assert_state_consistent();
+// if (test_thread_flag(TIF_NEED_FPU_LOAD))
+// switch_fpu_return();
if (unlikely(vcpu->arch.switch_db_regs)) {
set_debugreg(0, 7);
--
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next prev parent reply other threads:[~2019-07-19 20:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-17 14:27 [Bug 204209] New: kernel 5.2.1: "floating point exception" in qemu with kvm enabled bugzilla-daemon
2019-07-18 12:28 ` [Bug 204209] " bugzilla-daemon
2019-07-19 20:46 ` bugzilla-daemon [this message]
2019-07-28 12:03 ` bugzilla-daemon
2019-07-31 11:15 ` bugzilla-daemon
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