[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests.
On 07/11/2014 12:53 PM, konrad@xxxxxxxxxx wrote: > > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index c1b9aa8..5dcfa6e 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -3691,6 +3691,10 @@ bytes respectively. Such letter suffixes can also be > entirely omitted. > Disables the ticketlock slowpath using Xen PV > optimizations. > > + xen_nopv [X86,XEN] > + Disables the PV optimizations forcing the guest to run > + as generic HVM guest with no PV drivers. > + > xirc2ps_cs= [NET,PCMCIA] > Format: > > <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] > diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c > index ffb101e..eb82239 100644 > --- a/arch/x86/xen/enlighten.c > +++ b/arch/x86/xen/enlighten.c > @@ -1826,8 +1826,19 @@ static void __init xen_hvm_guest_init(void) > xen_hvm_init_mmu_ops(); > } > > +static bool xen_nopv = false; > +static __init int xen_parse_nopv(char *arg) > +{ > + xen_nopv = true; > + return 0; > +} > +early_param("xen_nopv", xen_parse_nopv); > + > static uint32_t __init xen_hvm_platform(void) > { > + if (xen_nopv) > + return 0; > + > if (xen_pv_domain()) > return 0; > > @@ -1836,6 +1847,8 @@ static uint32_t __init xen_hvm_platform(void) > > bool xen_hvm_need_lapic(void) > { > + if (xen_nopv) > + return false; > if (xen_pv_domain()) > return false; > if (!xen_hvm_domain()) > Any reason to not simply let xen_pv_domain() return false here? Also, the latter seems a bit odd? -hpa _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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