The guest in sync_regs_test does raw ucalls by directly accessing the
ucall IO port. It makes these ucalls without setting %rdi to a `struct
ucall`, which is what a ucall uses to pass messages. The issue is that
if the host did a get_ucall (the receiver side), it would try to access
the `struct ucall` at %rdi=0 which would lead to an error ("No mapping
for vm virtual address, gva: 0x0").
This issue is currently benign as there is no get_ucall in
sync_regs_test; however, that will change in the next commit as it
changes the unhandled exception reporting mechanism to use ucalls. In
that case, every vcpu_run is followed by a get_ucall to check if the
guest is trying to report an unhandled exception.
Fix this in advance by setting %rdi to a UCALL_NONE struct ucall for the
sync_regs_test guest.
Tested with gcc-[8,9,10], and clang-[9,11].
Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
---
tools/testing/selftests/kvm/x86_64/sync_regs_test.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/x86_64/sync_regs_test.c b/tools/testing/selftests/kvm/x86_64/sync_regs_test.c
index d672f0a473f8..fc03a150278d 100644
--- a/tools/testing/selftests/kvm/x86_64/sync_regs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/sync_regs_test.c
@@ -24,6 +24,10 @@
#define UCALL_PIO_PORT ((uint16_t)0x1000)
+struct ucall uc_none = {
+ .cmd = UCALL_NONE,
+};
+
/*
* ucall is embedded here to protect against compiler reshuffling registers
* before calling a function. In this test we only need to get KVM_EXIT_IO
@@ -34,7 +38,8 @@ void guest_code(void)
asm volatile("1: in %[port], %%al\n"
"add $0x1, %%rbx\n"
"jmp 1b"
- : : [port] "d" (UCALL_PIO_PORT) : "rax", "rbx");
+ : : [port] "d" (UCALL_PIO_PORT), "D" (&uc_none)
+ : "rax", "rbx");
}
static void compare_regs(struct kvm_regs *left, struct kvm_regs *right)
--
2.32.0.272.g935e593368-goog
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