From: Joao Martins <joao.m.mart...@oracle.com>
Handle the hypercall to set a per vcpu info, as opposed to using
shared_info equivalent. Also, Guests may not call
VCPUOP_register_vcpu_info and will fail in event channel operations if a
proper one isn't set in Qemu.
So derive the hva from shared_info which is where these are located when
guest doesn't seed an additional pointer.
Signed-off-by: Joao Martins <joao.m.mart...@oracle.com>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
---
target/i386/cpu.h | 1 +
target/i386/trace-events | 1 +
target/i386/xen-proto.h | 4 +++
target/i386/xen.c | 72 ++++++++++++++++++++++++++++++++++------
4 files changed, 68 insertions(+), 10 deletions(-)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 09c0281b8b..db152d6902 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1801,6 +1801,7 @@ typedef struct CPUArchState {
HVFX86LazyFlags hvf_lflags;
void *hvf_mmio_buf;
#endif
+ struct XenCPUState xen_vcpu;
uint64_t mcg_cap;
uint64_t mcg_ctl;
diff --git a/target/i386/trace-events b/target/i386/trace-events
index 2bf732ee07..1c6c44f291 100644
--- a/target/i386/trace-events
+++ b/target/i386/trace-events
@@ -15,3 +15,4 @@ kvm_sev_attestation_report(const char *mnonce, const char
*data) "mnonce %s data
# target/i386/xen.c
kvm_xen_hypercall(int cpu, uint8_t cpl, uint64_t input, uint64_t a0, uint64_t
a1, uint64_t a2, uint64_t ret) "xen_hypercall: cpu %d cpl %d input %" PRIu64 "
a0 0x%" PRIx64 " a1 0x%" PRIx64 " a2 0x%" PRIx64" ret 0x%" PRIu64
kvm_xen_set_shared_info(uint64_t gfn) "shared info at gfn 0x%" PRIx64
+kvm_xen_set_vcpu_attr(int cpu, int type, uint64_t gpa) "vcpu attr cpu %d type
%d gpa 0x%" PRIu64
diff --git a/target/i386/xen-proto.h b/target/i386/xen-proto.h
index c394909f54..8f6ee4c17b 100644
--- a/target/i386/xen-proto.h
+++ b/target/i386/xen-proto.h
@@ -15,5 +15,9 @@ typedef struct XenState {
struct shared_info *shared_info;
} XenState;
+typedef struct XenCPUState {
+ struct vcpu_info *info;
+} XenCPUState;
+
#endif
diff --git a/target/i386/xen.c b/target/i386/xen.c
index 61c9959981..59aca2ad19 100644
--- a/target/i386/xen.c
+++ b/target/i386/xen.c
@@ -14,6 +14,7 @@
#include "exec/address-spaces.h"
#include "xen.h"
#include "trace.h"
+#include "sysemu/sysemu.h"
#include "standard-headers/xen/version.h"
#include "standard-headers/xen/memory.h"
@@ -133,13 +134,24 @@ static int xen_set_shared_info(CPUState *cs, struct
shared_info *shi,
struct kvm_xen_hvm_attr xhsi;
XenState *xen = cs->xen_state;
KVMState *s = cs->kvm_state;
- int err;
+ XenCPUState *xcpu;
+ CPUState *cpu;
+ int i, err;
xhsi.type = KVM_XEN_ATTR_TYPE_SHARED_INFO;
xhsi.u.shared_info.gfn = gfn;
err = kvm_vm_ioctl(s, KVM_XEN_HVM_SET_ATTR, &xhsi);
trace_kvm_xen_set_shared_info(gfn);
xen->shared_info = shi;
+
+ for (i = 0; i < XEN_LEGACY_MAX_VCPUS; i++) {
+ cpu = qemu_get_cpu(i);
+ if (cpu) {
+ xcpu = &X86_CPU(cpu)->env.xen_vcpu;
+ xcpu->info = &shi->vcpu_info[cpu->cpu_index];
+ }
+ }
+
return err;
}
@@ -197,19 +209,57 @@ static int kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit,
return HCALL_ERR;
}
-static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit,
- int cmd, uint64_t arg)
+static int xen_set_vcpu_attr(CPUState *cs, uint16_t type, uint64_t gpa)
+{
+ struct kvm_xen_vcpu_attr xhsi;
+
+ xhsi.type = type;
+ xhsi.u.gpa = gpa;
+
+ trace_kvm_xen_set_vcpu_attr(cs->cpu_index, type, gpa);
+
+ return kvm_vcpu_ioctl(cs, KVM_XEN_VCPU_SET_ATTR, &xhsi);
+}
+
+static int vcpuop_register_vcpu_info(CPUState *cs, CPUState *target,
+ uint64_t arg)
{
+ XenCPUState *xt = &X86_CPU(target)->env.xen_vcpu;
+ struct vcpu_register_vcpu_info *rvi;
+ uint64_t gpa;
+ void *hva;
+
+ rvi = gva_to_hva(cs, arg);
+ if (!rvi) {
+ return -EFAULT;
+ }
+
+ gpa = ((rvi->mfn << PAGE_SHIFT) + rvi->offset);
+ hva = gpa_to_hva(gpa);
+ if (!hva) {
+ return -EFAULT;
+ }
+
+ xt->info = hva;
+ return xen_set_vcpu_attr(target, KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO, gpa);
+}
+
+static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu,
+ int cmd, int vcpu_id, uint64_t arg)
+{
+ CPUState *dest = qemu_get_cpu(vcpu_id);
+ CPUState *cs = CPU(cpu);
+ int err = -ENOSYS;
+
switch (cmd) {
case VCPUOP_register_vcpu_info: {
- /* no vcpu info placement for now */
- exit->u.hcall.result = -ENOSYS;
- return 0;
+ err = vcpuop_register_vcpu_info(cs, dest, arg);
+ break;
}
}
- exit->u.hcall.result = -ENOSYS;
- return HCALL_ERR;
+ exit->u.hcall.result = err;
+ return err ? HCALL_ERR : 0;
}
static int __kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
@@ -223,8 +273,10 @@ static int __kvm_xen_handle_exit(X86CPU *cpu, struct
kvm_xen_exit *exit)
switch (code) {
case __HYPERVISOR_vcpu_op:
- return kvm_xen_hcall_vcpu_op(exit, exit->u.hcall.params[0],
- exit->u.hcall.params[1]);
+ return kvm_xen_hcall_vcpu_op(exit, cpu,
+ exit->u.hcall.params[0],
+ exit->u.hcall.params[1],
+ exit->u.hcall.params[2]);
case __HYPERVISOR_hvm_op:
return kvm_xen_hcall_hvm_op(exit, exit->u.hcall.params[0],
exit->u.hcall.params[1]);
--
2.35.3
