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Subject[PATCH v4 6/7] xen: support GSI -> pirq remapping in PV on HVM guests
Date
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Disable pcifront when running on HVM: it is meant to be used with pv
guests that don't have PCI bus.

Use acpi_register_gsi_xen_hvm to remap GSIs into pirqs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/include/asm/xen/pci.h | 5 +++++
arch/x86/pci/xen.c | 16 ++++++++++++++++
drivers/xen/events.c | 6 +++++-
include/xen/interface/features.h | 3 +++
4 files changed, 29 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h
index 449c82f..f89a42a 100644
--- a/arch/x86/include/asm/xen/pci.h
+++ b/arch/x86/include/asm/xen/pci.h
@@ -3,10 +3,15 @@

#if defined(CONFIG_PCI_XEN)
extern int __init pci_xen_init(void);
+extern int __init pci_xen_hvm_init(void);
#define pci_xen 1
#else
#define pci_xen 0
#define pci_xen_init (0)
+static inline int pci_xen_hvm_init(void)
+{
+ return -1;
+}
#endif

#if defined(CONFIG_PCI_MSI)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index ef9b8b2..90a8f83 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -14,6 +14,7 @@

#include <asm/xen/hypervisor.h>

+#include <xen/features.h>
#include <xen/events.h>
#include <asm/xen/pci.h>

@@ -189,3 +190,18 @@ int __init pci_xen_init(void)
#endif
return 0;
}
+
+int __init pci_xen_hvm_init(void)
+{
+ if (!xen_feature(XENFEAT_hvm_pirqs))
+ return 0;
+
+#ifdef CONFIG_ACPI
+ /*
+ * We don't want to change the actual ACPI delivery model,
+ * just how GSIs get registered.
+ */
+ __acpi_register_gsi = acpi_register_gsi_xen_hvm;
+#endif
+ return 0;
+}
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 4fed942..5e4fe09 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -624,7 +624,8 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)

/* If we are a PV guest, we don't have GSIs (no ACPI passed). Therefore
* we are using the !xen_initial_domain() to drop in the function.*/
- if (identity_mapped_irq(gsi) || !xen_initial_domain()) {
+ if (identity_mapped_irq(gsi) || (!xen_initial_domain() &&
+ xen_pv_domain())) {
irq = gsi;
irq_to_desc_alloc_node(irq, 0);
dynamic_irq_init(irq);
@@ -1399,6 +1400,9 @@ void __init xen_init_IRQ(void)
if (xen_hvm_domain()) {
xen_callback_vector();
native_init_IRQ();
+ /* pci_xen_hvm_init must be called after native_init_IRQ so that
+ * __acpi_register_gsi can point at the right function */
+ pci_xen_hvm_init();
} else {
irq_ctx_init(smp_processor_id());
}
diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
index 70d2563..b6ca39a 100644
--- a/include/xen/interface/features.h
+++ b/include/xen/interface/features.h
@@ -47,6 +47,9 @@
/* x86: pvclock algorithm is safe to use on HVM */
#define XENFEAT_hvm_safe_pvclock 9

+/* x86: pirq can be used by HVM guests */
+#define XENFEAT_hvm_pirqs 10
+
#define XENFEAT_NR_SUBMAPS 1

#endif /* __XEN_PUBLIC_FEATURES_H__ */
--
1.5.6.5


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