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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 2/2] AMD/IOMMU: without XT, x2APIC needs to be forced into physical mode
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Sent: Monday, March 9, 2020 4:59 PM
>
> On 28.02.2020 13:12, Jan Beulich wrote:
> > The wider cluster mode APIC IDs aren't generally representable. Convert
> > the iommu_intremap variable into a tristate, allowing the AMD IOMMU
> > driver to signal this special restriction to the apic_x2apic_probe().
> > (Note: assignments to the variable get adjusted, while existing
> > consumers - all assuming a boolean property - are left alone.)
> >
> > Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Kevin,
>
> I see you've looked over and acked Xen patches over the weekend. Did
> you miss this one? It doesn't look controversial, so it'd be nice to
> have your ack, for it to go in.
>
> Jan
It is in my list. My review process was interrupted by other tasks
yesterday, and now is resumed. 😊
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
>
> > --- a/xen/arch/x86/genapic/x2apic.c
> > +++ b/xen/arch/x86/genapic/x2apic.c
> > @@ -236,12 +236,21 @@ const struct genapic *__init apic_x2apic
> > x2apic_phys = !iommu_intremap ||
> > (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL);
> > }
> > - else if ( !x2apic_phys && !iommu_intremap )
> > - {
> > - printk("WARNING: x2APIC cluster mode is not supported without
> interrupt remapping\n"
> > - "x2APIC: forcing phys mode\n");
> > - x2apic_phys = true;
> > - }
> > + else if ( !x2apic_phys )
> > + switch ( iommu_intremap )
> > + {
> > + case iommu_intremap_off:
> > + case iommu_intremap_restricted:
> > + printk("WARNING: x2APIC cluster mode is not supported %s
> interrupt remapping\n"
> > + "x2APIC: forcing phys mode\n",
> > + iommu_intremap == iommu_intremap_off ? "without"
> > + : "with
> > restricted");
> > + x2apic_phys = true;
> > + break;
> > +
> > + case iommu_intremap_full:
> > + break;
> > + }
> >
> > if ( x2apic_phys )
> > return &apic_x2apic_phys;
> > --- a/xen/drivers/passthrough/amd/iommu_init.c
> > +++ b/xen/drivers/passthrough/amd/iommu_init.c
> > @@ -1139,7 +1139,7 @@ static void __init amd_iommu_init_cleanu
> >
> > iommu_enabled = 0;
> > iommu_hwdom_passthrough = false;
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > iommuv2_enabled = 0;
> > }
> >
> > @@ -1413,6 +1413,9 @@ int __init amd_iommu_prepare(bool xt)
> > iommu->ctrl.int_cap_xt_en = xt && has_xt;
> > }
> >
> > + if ( iommu_intremap && !has_xt )
> > + iommu_intremap = iommu_intremap_restricted;
> > +
> > rc = amd_iommu_update_ivrs_mapping_acpi();
> >
> > error_out:
> > --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
> > +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
> > @@ -157,7 +157,7 @@ int __init acpi_ivrs_init(void)
> >
> > if ( (amd_iommu_detect_acpi() !=0) || (iommu_found() == 0) )
> > {
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > return -ENODEV;
> > }
> >
> > --- a/xen/drivers/passthrough/iommu.c
> > +++ b/xen/drivers/passthrough/iommu.c
> > @@ -35,7 +35,7 @@ bool __read_mostly iommu_quarantine = tr
> > bool_t __read_mostly iommu_igfx = 1;
> > bool_t __read_mostly iommu_snoop = 1;
> > bool_t __read_mostly iommu_qinval = 1;
> > -bool_t __read_mostly iommu_intremap = 1;
> > +enum iommu_intremap __read_mostly iommu_intremap =
> iommu_intremap_full;
> > bool_t __read_mostly iommu_crash_disable;
> >
> > static bool __hwdom_initdata iommu_hwdom_none;
> > @@ -91,7 +91,7 @@ static int __init parse_iommu_param(cons
> > else if ( (val = parse_boolean("qinval", s, ss)) >= 0 )
> > iommu_qinval = val;
> > else if ( (val = parse_boolean("intremap", s, ss)) >= 0 )
> > - iommu_intremap = val;
> > + iommu_intremap = val ? iommu_intremap_full :
> iommu_intremap_off;
> > else if ( (val = parse_boolean("intpost", s, ss)) >= 0 )
> > iommu_intpost = val;
> > #ifdef CONFIG_KEXEC
> > @@ -475,7 +475,7 @@ int __init iommu_setup(void)
> > iommu_enabled = (rc == 0);
> > }
> > if ( !iommu_enabled )
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> >
> > if ( (force_iommu && !iommu_enabled) ||
> > (force_intremap && !iommu_intremap) )
> > @@ -557,7 +557,8 @@ void iommu_crash_shutdown(void)
> >
> > if ( iommu_enabled )
> > iommu_get_ops()->crash_shutdown();
> > - iommu_enabled = iommu_intremap = iommu_intpost = 0;
> > + iommu_enabled = iommu_intpost = 0;
> > + iommu_intremap = iommu_intremap_off;
> > }
> >
> > int iommu_get_reserved_device_memory(iommu_grdm_t *func, void
> *ctxt)
> > --- a/xen/drivers/passthrough/vtd/iommu.c
> > +++ b/xen/drivers/passthrough/vtd/iommu.c
> > @@ -2177,7 +2177,7 @@ static int __must_check init_vtd_hw(void
> > {
> > if ( ioapic_to_iommu(IO_APIC_ID(apic)) == NULL )
> > {
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > dprintk(XENLOG_ERR VTDPREFIX,
> > "ioapic_to_iommu: ioapic %#x (id: %#x) is NULL! "
> > "Will not try to enable Interrupt Remapping.\n",
> > @@ -2193,7 +2193,7 @@ static int __must_check init_vtd_hw(void
> > iommu = drhd->iommu;
> > if ( enable_intremap(iommu, 0) != 0 )
> > {
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > dprintk(XENLOG_WARNING VTDPREFIX,
> > "Interrupt Remapping not enabled\n");
> >
> > @@ -2295,7 +2295,7 @@ static int __init vtd_setup(void)
> > iommu_qinval = 0;
> >
> > if ( iommu_intremap && !ecap_intr_remap(iommu->ecap) )
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> >
> > /*
> > * We cannot use posted interrupt if X86_FEATURE_CX16 is
> > @@ -2320,7 +2320,7 @@ static int __init vtd_setup(void)
> >
> > if ( !iommu_qinval && iommu_intremap )
> > {
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > dprintk(XENLOG_WARNING VTDPREFIX, "Interrupt Remapping
> disabled "
> > "since Queued Invalidation isn't supported or enabled.\n");
> > }
> > @@ -2347,7 +2347,7 @@ static int __init vtd_setup(void)
> > iommu_snoop = 0;
> > iommu_hwdom_passthrough = false;
> > iommu_qinval = 0;
> > - iommu_intremap = 0;
> > + iommu_intremap = iommu_intremap_off;
> > iommu_intpost = 0;
> > return ret;
> > }
> > --- a/xen/include/xen/iommu.h
> > +++ b/xen/include/xen/iommu.h
> > @@ -54,7 +54,18 @@ static inline bool_t dfn_eq(dfn_t x, dfn
> >
> > extern bool_t iommu_enable, iommu_enabled;
> > extern bool force_iommu, iommu_quarantine, iommu_verbose,
> iommu_igfx;
> > -extern bool_t iommu_snoop, iommu_qinval, iommu_intremap,
> iommu_intpost;
> > +extern bool_t iommu_snoop, iommu_qinval, iommu_intpost;
> > +extern enum __packed iommu_intremap {
> > + /*
> > + * In order to allow traditional boolean uses of the iommu_intremap
> > + * variable, the "off" value has to come first (yielding a value of
> > zero).
> > + */
> > + iommu_intremap_off,
> > +#ifdef CONFIG_X86
> > + iommu_intremap_restricted,
> > +#endif
> > + iommu_intremap_full,
> > +} iommu_intremap;
> >
> > #if defined(CONFIG_IOMMU_FORCE_PT_SHARE)
> > #define iommu_hap_pt_share true
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxxx
> > https://lists.xenproject.org/mailman/listinfo/xen-devel
> >
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