On 23/01/19 18:22, Sean Christopherson wrote: > KVM's paravirtual IPI hypercall is completely broken on 32-bit hosts > due to the invocation of kvm_pv_send_ipi() being wrapped with > "#ifdef CONFIG_X86_64". All evidence points to this being an > inadvertent change that was introduced in v2 of the series[1] when > kvm_pv_send_ipi() was reworked, e.g. the initial version[2] wired > up the function for all x86 flavors and kvm_pv_send_ipi() itself > differentiates between 32-bit and 64-bit hosts. > > The second patch adds checks on the result of the PV IPI hypercall in > the guest to aid in triaging failures, e.g. when running on 32-bit KVM > hosts that have not been fixed. > > [1] https://patchwork.kernel.org/patch/10500887/ > [2] https://patchwork.kernel.org/patch/10496067/ > > Sean Christopherson (2): > KVM: x86: Fix PV IPIs for 32-bit KVM host > KVM: x86: WARN_ONCE if sending a PV IPI returns a fatal error > > arch/x86/kernel/kvm.c | 7 +++++-- > arch/x86/kvm/x86.c | 2 +- > 2 files changed, 6 insertions(+), 3 deletions(-) > Queued, thanks. Paolo
