@@ -36,6 +36,7 @@
#include <asm/xstate.h>
#include <asm/psr.h>
#include <asm/cpu-policy.h>
+#include <asm/io_apic.h>
static int update_domain_cpu_policy(struct domain *d,
xen_domctl_cpu_policy_t *xdpc)
@@ -237,6 +238,38 @@ long arch_do_domctl(
break;
}
+ case XEN_DOMCTL_gsi_permission:
+ {
+ int irq;
+ uint8_t mask = 1;
+ unsigned int gsi = domctl->u.gsi_permission.gsi;
+ bool allow = domctl->u.gsi_permission.allow_access;
+
+ /* Check all bits and pads are zero except lowest bit */
+ ret = -EINVAL;
+ if ( domctl->u.gsi_permission.allow_access & ( !mask ) )
+ goto gsi_permission_out;
+ for ( i = 0; i < ARRAY_SIZE(domctl->u.gsi_permission.pad); ++i )
+ if ( domctl->u.gsi_permission.pad[i] )
+ goto gsi_permission_out;
+
+ if ( gsi >= nr_irqs_gsi || ( irq = gsi_2_irq(gsi) ) < 0 )
+ goto gsi_permission_out;
+
+ ret = -EPERM;
+ if ( !irq_access_permitted(currd, irq) ||
+ xsm_irq_permission(XSM_HOOK, d, irq, allow) )
+ goto gsi_permission_out;
+
+ if ( allow )
+ ret = irq_permit_access(d, irq);
+ else
+ ret = irq_deny_access(d, irq);
+
+ gsi_permission_out:
+ break;
+ }
+
case XEN_DOMCTL_getpageframeinfo3:
{
unsigned int num = domctl->u.getpageframeinfo3.num;
@@ -213,5 +213,7 @@ unsigned highest_gsi(void);
int ioapic_guest_read( unsigned long physbase, unsigned int reg, u32 *pval);
int ioapic_guest_write(unsigned long physbase, unsigned int reg, u32 val);
+int mp_find_ioapic(int gsi);
+int gsi_2_irq(int gsi);
#endif
@@ -955,6 +955,23 @@ static int pin_2_irq(int idx, int apic, int pin)
return irq;
}
+int gsi_2_irq(int gsi)
+{
+ int ioapic, pin, irq;
+
+ ioapic = mp_find_ioapic(gsi);
+ if ( ioapic < 0 )
+ return -EINVAL;
+
+ pin = gsi - io_apic_gsi_base(ioapic);
+
+ irq = apic_pin_2_gsi_irq(ioapic, pin);
+ if ( irq <= 0 )
+ return -EINVAL;
+
+ return irq;
+}
+
static inline int IO_APIC_irq_trigger(int irq)
{
int apic, idx, pin;
@@ -841,8 +841,7 @@ static struct mp_ioapic_routing {
} mp_ioapic_routing[MAX_IO_APICS];
-static int mp_find_ioapic (
- int gsi)
+int mp_find_ioapic(int gsi)
{
unsigned int i;
@@ -464,6 +464,12 @@ struct xen_domctl_irq_permission {
uint8_t pad[3];
};
+/* XEN_DOMCTL_gsi_permission */
+struct xen_domctl_gsi_permission {
+ uint32_t gsi;
+ uint8_t allow_access; /* flag to specify enable/disable of x86 gsi access */
+ uint8_t pad[3];
+};
/* XEN_DOMCTL_iomem_permission */
struct xen_domctl_iomem_permission {
@@ -1306,6 +1312,7 @@ struct xen_domctl {
#define XEN_DOMCTL_get_paging_mempool_size 85
#define XEN_DOMCTL_set_paging_mempool_size 86
#define XEN_DOMCTL_dt_overlay 87
+#define XEN_DOMCTL_gsi_permission 88
#define XEN_DOMCTL_gdbsx_guestmemio 1000
#define XEN_DOMCTL_gdbsx_pausevcpu 1001
#define XEN_DOMCTL_gdbsx_unpausevcpu 1002
@@ -1328,6 +1335,7 @@ struct xen_domctl {
struct xen_domctl_setdomainhandle setdomainhandle;
struct xen_domctl_setdebugging setdebugging;
struct xen_domctl_irq_permission irq_permission;
+ struct xen_domctl_gsi_permission gsi_permission;
struct xen_domctl_iomem_permission iomem_permission;
struct xen_domctl_ioport_permission ioport_permission;
struct xen_domctl_hypercall_init hypercall_init;
@@ -685,6 +685,7 @@ static int cf_check flask_domctl(struct domain *d, int cmd)
case XEN_DOMCTL_shadow_op:
case XEN_DOMCTL_ioport_permission:
case XEN_DOMCTL_ioport_mapping:
+ case XEN_DOMCTL_gsi_permission:
#endif
#ifdef CONFIG_HAS_PASSTHROUGH
/*