mirror of https://github.com/xemu-project/xemu.git
hw/xen: Implement EVTCHNOP_close
It calls an internal close_port() helper which will also be used from EVTCHNOP_reset and will actually do the work to disconnect/unbind a port once any of that is actually implemented in the first place. That in turn calls a free_port() internal function which will be in error paths after allocation. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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@ -21,6 +21,7 @@
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "xen_evtchn.h"
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#include "xen_overlay.h"
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@ -40,6 +41,41 @@ typedef struct XenEvtchnPort {
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uint16_t type_val; /* pirq# / virq# / remote port according to type */
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} XenEvtchnPort;
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/* 32-bit compatibility definitions, also used natively in 32-bit build */
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struct compat_arch_vcpu_info {
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unsigned int cr2;
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unsigned int pad[5];
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};
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struct compat_vcpu_info {
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uint8_t evtchn_upcall_pending;
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uint8_t evtchn_upcall_mask;
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uint16_t pad;
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uint32_t evtchn_pending_sel;
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struct compat_arch_vcpu_info arch;
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struct vcpu_time_info time;
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}; /* 64 bytes (x86) */
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struct compat_arch_shared_info {
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unsigned int max_pfn;
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unsigned int pfn_to_mfn_frame_list_list;
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unsigned int nmi_reason;
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unsigned int p2m_cr3;
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unsigned int p2m_vaddr;
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unsigned int p2m_generation;
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uint32_t wc_sec_hi;
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};
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struct compat_shared_info {
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struct compat_vcpu_info vcpu_info[XEN_LEGACY_MAX_VCPUS];
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uint32_t evtchn_pending[32];
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uint32_t evtchn_mask[32];
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uint32_t wc_version; /* Version counter: see vcpu_time_info_t. */
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uint32_t wc_sec;
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uint32_t wc_nsec;
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struct compat_arch_shared_info arch;
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};
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#define COMPAT_EVTCHN_2L_NR_CHANNELS 1024
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/*
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@ -257,3 +293,90 @@ int xen_evtchn_status_op(struct evtchn_status *status)
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qemu_mutex_unlock(&s->port_lock);
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return 0;
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}
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static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port)
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{
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void *p = xen_overlay_get_shinfo_ptr();
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if (!p) {
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return -ENOTSUP;
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}
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if (xen_is_long_mode()) {
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struct shared_info *shinfo = p;
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const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]);
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typeof(shinfo->evtchn_pending[0]) mask;
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int idx = port / bits_per_word;
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int offset = port % bits_per_word;
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mask = 1UL << offset;
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qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask);
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} else {
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struct compat_shared_info *shinfo = p;
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const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]);
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typeof(shinfo->evtchn_pending[0]) mask;
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int idx = port / bits_per_word;
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int offset = port % bits_per_word;
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mask = 1UL << offset;
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qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask);
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}
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return 0;
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}
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static void free_port(XenEvtchnState *s, evtchn_port_t port)
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{
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s->port_table[port].type = EVTCHNSTAT_closed;
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s->port_table[port].type_val = 0;
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s->port_table[port].vcpu = 0;
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if (s->nr_ports == port + 1) {
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do {
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s->nr_ports--;
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} while (s->nr_ports &&
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s->port_table[s->nr_ports - 1].type == EVTCHNSTAT_closed);
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}
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/* Clear pending event to avoid unexpected behavior on re-bind. */
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clear_port_pending(s, port);
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}
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static int close_port(XenEvtchnState *s, evtchn_port_t port)
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{
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XenEvtchnPort *p = &s->port_table[port];
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switch (p->type) {
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case EVTCHNSTAT_closed:
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return -ENOENT;
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default:
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break;
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}
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free_port(s, port);
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return 0;
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}
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int xen_evtchn_close_op(struct evtchn_close *close)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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int ret;
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if (!s) {
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return -ENOTSUP;
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}
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if (!valid_port(close->port)) {
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return -EINVAL;
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}
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qemu_mutex_lock(&s->port_lock);
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ret = close_port(s, close->port);
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qemu_mutex_unlock(&s->port_lock);
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return ret;
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}
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@ -16,6 +16,8 @@ void xen_evtchn_create(void);
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int xen_evtchn_set_callback_param(uint64_t param);
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struct evtchn_status;
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struct evtchn_close;
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int xen_evtchn_status_op(struct evtchn_status *status);
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int xen_evtchn_close_op(struct evtchn_close *close);
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#endif /* QEMU_XEN_EVTCHN_H */
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@ -805,6 +805,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
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}
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break;
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}
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case EVTCHNOP_close: {
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struct evtchn_close close;
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qemu_build_assert(sizeof(close) == 4);
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if (kvm_copy_from_gva(cs, arg, &close, sizeof(close))) {
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err = -EFAULT;
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break;
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}
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err = xen_evtchn_close_op(&close);
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break;
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}
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default:
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return false;
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}
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