mirror of
https://github.com/qemu/qemu.git
synced 2025-07-31 09:27:44 +00:00
428c3ece97
On Xen MSIs can be remapped into pirqs, which are a type of event channels. It's mostly for the benefit of PCI passthrough devices, to avoid the overhead of interacting with the emulated lapic. However remapping interrupts and MSIs is also supported for emulated devices, such as the e1000 and virtio-net. When an interrupt or an MSI is remapped into a pirq, masking and unmasking is done by masking and unmasking the event channel. The masking bit on the PCI config space or MSI-X table should be ignored, but it isn't at the moment. As a consequence emulated devices which use MSI or MSI-X, such as virtio-net, don't work properly (the guest doesn't receive any notifications). The mechanism was working properly when xen_apic was introduced, but I haven't narrowed down which commit in particular is causing the regression. Fix the issue by ignoring the masking bit for MSI and MSI-X which have been remapped into pirqs. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
#ifndef QEMU_HW_XEN_H
|
|
#define QEMU_HW_XEN_H 1
|
|
/*
|
|
* public xen header
|
|
* stuff needed outside xen-*.c, i.e. interfaces to qemu.
|
|
* must not depend on any xen headers being present in
|
|
* /usr/include/xen, so it can be included unconditionally.
|
|
*/
|
|
#include <inttypes.h>
|
|
|
|
#include "hw/irq.h"
|
|
#include "qemu-common.h"
|
|
#include "qemu/typedefs.h"
|
|
|
|
/* xen-machine.c */
|
|
enum xen_mode {
|
|
XEN_EMULATE = 0, // xen emulation, using xenner (default)
|
|
XEN_CREATE, // create xen domain
|
|
XEN_ATTACH // attach to xen domain created by xend
|
|
};
|
|
|
|
extern uint32_t xen_domid;
|
|
extern enum xen_mode xen_mode;
|
|
|
|
extern bool xen_allowed;
|
|
|
|
static inline bool xen_enabled(void)
|
|
{
|
|
return xen_allowed;
|
|
}
|
|
|
|
int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
|
|
void xen_piix3_set_irq(void *opaque, int irq_num, int level);
|
|
void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len);
|
|
void xen_hvm_inject_msi(uint64_t addr, uint32_t data);
|
|
int xen_is_pirq_msi(uint32_t msi_data);
|
|
|
|
qemu_irq *xen_interrupt_controller_init(void);
|
|
|
|
void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
|
|
|
|
#if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
|
|
void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory);
|
|
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
|
|
struct MemoryRegion *mr, Error **errp);
|
|
void xen_modified_memory(ram_addr_t start, ram_addr_t length);
|
|
#endif
|
|
|
|
void xen_register_framebuffer(struct MemoryRegion *mr);
|
|
|
|
#if defined(CONFIG_XEN) && CONFIG_XEN_CTRL_INTERFACE_VERSION < 400
|
|
# define HVM_MAX_VCPUS 32
|
|
#endif
|
|
|
|
#endif /* QEMU_HW_XEN_H */
|