[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.16] x86/vmx: Don't spuriously crash the domain when INIT is received
commit b1022b65de59828d40d9d71cc734a42c1c30c972 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Fri Mar 31 08:40:27 2023 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Mar 31 08:40:27 2023 +0200 x86/vmx: Don't spuriously crash the domain when INIT is received In VMX operation, the handling of INIT IPIs is changed. Instead of the CPU resetting, the next VMEntry fails with EXIT_REASON_INIT. From the TXT spec, the intent of this behaviour is so that an entity which cares can scrub secrets from RAM before participating in an orderly shutdown. Right now, Xen's behaviour is that when an INIT arrives, the HVM VM which schedules next is killed (citing an unknown VMExit), *and* we ignore the INIT and continue blindly onwards anyway. This patch addresses only the first of these two problems by ignoring the INIT and continuing without crashing the VM in question. The second wants addressing too, just as soon as we've figured out something better to do... Discovered as collateral damage from when an AP triple faults on S3 resume on Intel TigerLake platforms. Link: https://github.com/QubesOS/qubes-issues/issues/7283 Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> master commit: b1f11273d5a774cc88a3685c96c2e7cf6385e3b6 master date: 2023-03-24 22:49:58 +0000 --- xen/arch/x86/hvm/vmx/vmx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index c8a839cd5e..cebe46ef6a 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -4002,6 +4002,10 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs) case EXIT_REASON_MCE_DURING_VMENTRY: do_machine_check(regs); break; + + case EXIT_REASON_INIT: + printk(XENLOG_ERR "Error: INIT received - ignoring\n"); + return; /* Renter the guest without further processing */ } /* Now enable interrupts so it's safe to take locks. */ -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.16
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