xen/x86: allow PVH Dom0 without XEN_PV=y

Decouple XEN_DOM0 from XEN_PV, converting some existing uses of XEN_DOM0
to a new XEN_PV_DOM0. (I'm not convinced all are really / should really
be PV-specific, but for starters I've tried to be conservative.)

For PVH Dom0 the hypervisor populates MADT with only x2APIC entries, so
without x2APIC support enabled in the kernel things aren't going to work
very well. (As opposed, DomU-s would only ever see LAPIC entries in MADT
as of now.) Note that this then requires PVH Dom0 to be 64-bit, as
X86_X2APIC depends on X86_64.

In the course of this xen_running_on_version_or_later() needs to be
available more broadly. Move it from a PV-specific to a generic file,
considering that what it does isn't really PV-specific at all anyway.

Note that xen/interface/version.h cannot be included on its own; in
enlighten.c, which uses SCHEDOP_* anyway, include xen/interface/sched.h
first to resolve the apparently sole missing type (xen_ulong_t).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/983bb72f-53df-b6af-14bd-5e088bd06a08@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h
index 3506d8c598c18b78596816ab99e98a5ab99d4ba6..4557f7cb0fa6ea175a99cb801886ecc273d9a16f 100644 (file)
--- a/arch/x86/include/asm/xen/pci.h
+++ b/arch/x86/include/asm/xen/pci.h
@@ -14,16 +14,19 @@ static inline int pci_xen_hvm_init(void)
        return -1;
 }
 #endif
-#if defined(CONFIG_XEN_DOM0)
+#ifdef CONFIG_XEN_PV_DOM0
 int __init pci_xen_initial_domain(void);
-int xen_find_device_domain_owner(struct pci_dev *dev);
-int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain);
-int xen_unregister_device_domain_owner(struct pci_dev *dev);
 #else
 static inline int __init pci_xen_initial_domain(void)
 {
        return -1;
 }
+#endif
+#ifdef CONFIG_XEN_DOM0
+int xen_find_device_domain_owner(struct pci_dev *dev);
+int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain);
+int xen_unregister_device_domain_owner(struct pci_dev *dev);
+#else
 static inline int xen_find_device_domain_owner(struct pci_dev *dev)
 {
        return -1;

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 3d41a09c2c14ca58f9303166103af28b2a0934db..5debe4ac6f8192b4c3ed89e10e8babd9919616f6 100644 (file)
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -113,7 +113,7 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
                                 false /* no mapping of GSI to PIRQ */);
 }
 
-#ifdef CONFIG_XEN_DOM0
+#ifdef CONFIG_XEN_PV_DOM0
 static int xen_register_gsi(u32 gsi, int triggering, int polarity)
 {
        int rc, irq;
@@ -261,7 +261,7 @@ error:
        return irq;
 }
 
-#ifdef CONFIG_XEN_DOM0
+#ifdef CONFIG_XEN_PV_DOM0
 static bool __read_mostly pci_seg_supported = true;
 
 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
@@ -375,10 +375,10 @@ static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
                WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
        }
 }
-#else /* CONFIG_XEN_DOM0 */
+#else /* CONFIG_XEN_PV_DOM0 */
 #define xen_initdom_setup_msi_irqs     NULL
 #define xen_initdom_restore_msi_irqs   NULL
-#endif /* !CONFIG_XEN_DOM0 */
+#endif /* !CONFIG_XEN_PV_DOM0 */
 
 static void xen_teardown_msi_irqs(struct pci_dev *dev)
 {
@@ -555,7 +555,7 @@ int __init pci_xen_hvm_init(void)
        return 0;
 }
 
-#ifdef CONFIG_XEN_DOM0
+#ifdef CONFIG_XEN_PV_DOM0
 int __init pci_xen_initial_domain(void)
 {
        int irq;
@@ -583,6 +583,9 @@ int __init pci_xen_initial_domain(void)
        }
        return 0;
 }
+#endif
+
+#ifdef CONFIG_XEN_DOM0
 
 struct xen_device_domain_owner {
        domid_t domain;
@@ -656,4 +659,4 @@ int xen_unregister_device_domain_owner(struct pci_dev *dev)
        return 0;
 }
 EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
-#endif
+#endif /* CONFIG_XEN_DOM0 */

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index afc1da68b06d80bcd8afda6989689f400f90af56..6bcd3d8ca6ac5fa46290b369e0119d9ea652c7d8 100644 (file)
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -43,13 +43,9 @@ config XEN_PV_SMP
        def_bool y
        depends on XEN_PV && SMP
 
-config XEN_DOM0
-       bool "Xen PV Dom0 support"
-       default y
-       depends on XEN_PV && PCI_XEN && SWIOTLB_XEN
-       depends on X86_IO_APIC && ACPI && PCI
-       help
-         Support running as a Xen PV Dom0 guest.
+config XEN_PV_DOM0
+       def_bool y
+       depends on XEN_PV && XEN_DOM0
 
 config XEN_PVHVM
        def_bool y
@@ -86,3 +82,12 @@ config XEN_PVH
        def_bool n
        help
          Support for running as a Xen PVH guest.
+
+config XEN_DOM0
+       bool "Xen Dom0 support"
+       default XEN_PV
+       depends on (XEN_PV && SWIOTLB_XEN) || (XEN_PVH && X86_64)
+       depends on X86_IO_APIC && ACPI && PCI
+       select X86_X2APIC if XEN_PVH && X86_64
+       help
+         Support running as a Xen Dom0 guest.

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 40b5779fce21cf85be58b626ecb4e7245ff75a4f..4953260e281c38d651b65cc0affaba99d7ecf645 100644 (file)
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -45,7 +45,7 @@ obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
 
 obj-$(CONFIG_XEN_DEBUG_FS)     += debugfs.o
 
-obj-$(CONFIG_XEN_DOM0)         += vga.o
+obj-$(CONFIG_XEN_PV_DOM0)      += vga.o
 
 obj-$(CONFIG_SWIOTLB_XEN)      += pci-swiotlb-xen.o
 

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index f252faf5028f23aa9818cd704869248f78c00809..50146603807575e529991bdb4d06b2c6f24a4885 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -10,6 +10,8 @@
 
 #include <xen/xen.h>
 #include <xen/features.h>
+#include <xen/interface/sched.h>
+#include <xen/interface/version.h>
 #include <xen/page.h>
 
 #include <asm/xen/hypercall.h>
@@ -257,6 +259,21 @@ int xen_vcpu_setup(int cpu)
        return ((per_cpu(xen_vcpu, cpu) == NULL) ? -ENODEV : 0);
 }
 
+/* Check if running on Xen version (major, minor) or later */
+bool xen_running_on_version_or_later(unsigned int major, unsigned int minor)
+{
+       unsigned int version;
+
+       if (!xen_domain())
+               return false;
+
+       version = HYPERVISOR_xen_version(XENVER_version, NULL);
+       if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
+               ((version >> 16) > major))
+               return true;
+       return false;
+}
+
 void xen_reboot(int reason)
 {
        struct sched_shutdown r = { .reason = reason };

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 6e0d0754f94f5b98f3fd4757547e514d9be43fe5..e46953249e397ddbe0d2d827b62368d2823a48ea 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -142,22 +142,6 @@ static void __init xen_pv_guest_late_init(void)
 #endif
 }
 
-/* Check if running on Xen version (major, minor) or later */
-bool
-xen_running_on_version_or_later(unsigned int major, unsigned int minor)
-{
-       unsigned int version;
-
-       if (!xen_domain())
-               return false;
-
-       version = HYPERVISOR_xen_version(XENVER_version, NULL);
-       if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
-               ((version >> 16) > major))
-               return true;
-       return false;
-}
-
 static __read_mostly unsigned int cpuid_leaf5_ecx_val;
 static __read_mostly unsigned int cpuid_leaf5_edx_val;
 

diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 8d7ec49a35fbb686c5ec93842ce681390039a1e1..6d9b2b3e0c1c631b91e15a95ce54bd7fecfdd044 100644 (file)
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -109,7 +109,7 @@ static inline void xen_uninit_lock_cpu(int cpu)
 
 struct dom0_vga_console_info;
 
-#ifdef CONFIG_XEN_DOM0
+#ifdef CONFIG_XEN_PV_DOM0
 void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
 #else
 static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 22f5aff0c1367127dfc73a5a81f1c19f8b7b2ecd..1b2c3aca6887c848678c822261af8662b100b506 100644 (file)
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -241,7 +241,7 @@ config XEN_PRIVCMD
 
 config XEN_ACPI_PROCESSOR
        tristate "Xen ACPI processor"
-       depends on XEN && XEN_DOM0 && X86 && ACPI_PROCESSOR && CPU_FREQ
+       depends on XEN && XEN_PV_DOM0 && X86 && ACPI_PROCESSOR && CPU_FREQ
        default m
        help
          This ACPI processor uploads Power Management information to the Xen
@@ -259,7 +259,7 @@ config XEN_ACPI_PROCESSOR
 
 config XEN_MCE_LOG
        bool "Xen platform mcelog"
-       depends on XEN_DOM0 && X86_MCE
+       depends on XEN_PV_DOM0 && X86_MCE
        help
          Allow kernel fetching MCE error from Xen platform and
          converting it into Linux mcelog format for mcelog tools