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kvm: selftests: introduce ucall

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Rework the guest exit to userspace code to generalize the concept
into what it is, a "hypercall to userspace", and provide two
implementations of it: the PortIO version currently used, but only
useable by x86, and an MMIO version that other architectures (except
s390) can use.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrew Jones
2018-09-18 19:54:25 +02:00
committed by Paolo Bonzini
parent 6c930268bc
commit 14c47b7530
10 changed files with 218 additions and 81 deletions
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68
tools/testing/selftests/kvm/include/kvm_util.h
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@@ -152,43 +152,49 @@ allocate_kvm_dirty_log(struct kvm_userspace_memory_region *region);
int vm_create_device(struct kvm_vm *vm, struct kvm_create_device *cd);
#define GUEST_PORT_SYNC 0x1000
#define GUEST_PORT_ABORT 0x1001
#define GUEST_PORT_DONE 0x1002
#define sync_global_to_guest(vm, g) ({ \
typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g)); \
memcpy(_p, &(g), sizeof(g)); \
})
static inline void __exit_to_l0(uint16_t port, uint64_t arg0, uint64_t arg1)
{
__asm__ __volatile__("in %[port], %%al"
:
: [port]"d"(port), "D"(arg0), "S"(arg1)
: "rax");
}
#define sync_global_from_guest(vm, g) ({ \
typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g)); \
memcpy(&(g), _p, sizeof(g)); \
})
/*
* Allows to pass three arguments to the host: port is 16bit wide,
* arg0 & arg1 are 64bit wide
*/
#define GUEST_SYNC_ARGS(_port, _arg0, _arg1) \
__exit_to_l0(_port, (uint64_t) (_arg0), (uint64_t) (_arg1))
/* ucall implementation types */
typedef enum {
UCALL_PIO,
UCALL_MMIO,
} ucall_type_t;
#define GUEST_ASSERT(_condition) do { \
if (!(_condition)) \
GUEST_SYNC_ARGS(GUEST_PORT_ABORT, \
"Failed guest assert: " \
#_condition, __LINE__); \
} while (0)
/* Common ucalls */
enum {
UCALL_NONE,
UCALL_SYNC,
UCALL_ABORT,
UCALL_DONE,
};
#define GUEST_SYNC(stage) GUEST_SYNC_ARGS(GUEST_PORT_SYNC, "hello", stage)
#define UCALL_MAX_ARGS 6
#define GUEST_DONE() GUEST_SYNC_ARGS(GUEST_PORT_DONE, 0, 0)
struct ucall {
uint64_t cmd;
uint64_t args[UCALL_MAX_ARGS];
};
struct guest_args {
uint64_t arg0;
uint64_t arg1;
uint16_t port;
} __attribute__ ((packed));
void ucall_init(struct kvm_vm *vm, ucall_type_t type, void *arg);
void ucall_uninit(struct kvm_vm *vm);
void ucall(uint64_t cmd, int nargs, ...);
uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
void guest_args_read(struct kvm_vm *vm, uint32_t vcpu_id,
struct guest_args *args);
#define GUEST_SYNC(stage) ucall(UCALL_SYNC, 2, "hello", stage)
#define GUEST_DONE() ucall(UCALL_DONE, 0)
#define GUEST_ASSERT(_condition) do { \
if (!(_condition)) \
ucall(UCALL_ABORT, 2, \
"Failed guest assert: " \
#_condition, __LINE__); \
} while (0)
#endif /* SELFTEST_KVM_UTIL_H */