Merge tag 'pull-xenfv-stable-20231106' of git://git.infradead.org/users/dwmw2/qemu into staging

Bugfixes for emulated Xen support

Selected bugfixes for mainline and stable, especially to the per-vCPU
local APIC vector delivery mode for event channel notifications, which
was broken in a number of ways.

The xen-block driver has been defaulting to the wrong protocol for x86
guest, and this fixes that — which is technically an incompatible change
but I'm fairly sure nobody relies on the broken behaviour (and in
production I *have* seen guests which rely on the correct behaviour,
which now matches the blkback driver in the Linux kernel).

A handful of other simple fixes for issues which came to light as new
features (qv) were being developed.

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# gpg: Good signature from "David Woodhouse <dwmw2@infradead.org>" [unknown]
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# gpg:                 aka "David Woodhouse <david@woodhou.se>" [unknown]
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* tag 'pull-xenfv-stable-20231106' of git://git.infradead.org/users/dwmw2/qemu:
  hw/xen: use correct default protocol for xen-block on x86
  hw/xen: take iothread mutex in xen_evtchn_reset_op()
  hw/xen: fix XenStore watch delivery to guest
  hw/xen: don't clear map_track[] in xen_gnttab_reset()
  hw/xen: select kernel mode for per-vCPU event channel upcall vector
  i386/xen: fix per-vCPU upcall vector for Xen emulation
  i386/xen: Don't advertise XENFEAT_supervisor_mode_kernel

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 76348f9d5d..75b2c557b9 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -267,7 +267,6 @@ static bool kvm_xen_hcall_xen_version(struct kvm_xen_exit *exit, X86CPU *cpu,
             fi.submap |= 1 << XENFEAT_writable_page_tables |
                          1 << XENFEAT_writable_descriptor_tables |
                          1 << XENFEAT_auto_translated_physmap |
-                         1 << XENFEAT_supervisor_mode_kernel |
                          1 << XENFEAT_hvm_callback_vector |
                          1 << XENFEAT_hvm_safe_pvclock |
                          1 << XENFEAT_hvm_pirqs;
@@ -307,7 +306,7 @@ static int kvm_xen_set_vcpu_callback_vector(CPUState *cs)
 
     trace_kvm_xen_set_vcpu_callback(cs->cpu_index, vector);
 
-    return kvm_vcpu_ioctl(cs, KVM_XEN_HVM_SET_ATTR, &xva);
+    return kvm_vcpu_ioctl(cs, KVM_XEN_VCPU_SET_ATTR, &xva);
 }
 
 static void do_set_vcpu_callback_vector(CPUState *cs, run_on_cpu_data data)
@@ -425,6 +424,13 @@ void kvm_xen_set_callback_asserted(void)
     }
 }
 
+bool kvm_xen_has_vcpu_callback_vector(void)
+{
+    CPUState *cs = qemu_get_cpu(0);
+
+    return cs && !!X86_CPU(cs)->env.xen_vcpu_callback_vector;
+}
+
 void kvm_xen_inject_vcpu_callback_vector(uint32_t vcpu_id, int type)
 {
     CPUState *cs = qemu_get_cpu(vcpu_id);
@@ -441,7 +447,8 @@ void kvm_xen_inject_vcpu_callback_vector(uint32_t vcpu_id, int type)
          * deliver it as an MSI.
          */
         MSIMessage msg = {
-            .address = APIC_DEFAULT_ADDRESS | X86_CPU(cs)->apic_id,
+            .address = APIC_DEFAULT_ADDRESS |
+                       (X86_CPU(cs)->apic_id << MSI_ADDR_DEST_ID_SHIFT),
             .data = vector | (1UL << MSI_DATA_LEVEL_SHIFT),
         };
         kvm_irqchip_send_msi(kvm_state, msg);
@@ -850,8 +857,7 @@ static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, X86CPU *cpu,
     int ret = -ENOSYS;
     switch (cmd) {
     case HVMOP_set_evtchn_upcall_vector:
-        ret = kvm_xen_hcall_evtchn_upcall_vector(exit, cpu,
-                                                 exit->u.hcall.params[0]);
+        ret = kvm_xen_hcall_evtchn_upcall_vector(exit, cpu, arg);
         break;
 
     case HVMOP_pagetable_dying: