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authorPaolo Bonzini <pbonzini@redhat.com>2021-11-12 10:53:41 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2021-11-12 10:53:52 +0300
commit3e067fd8503d6205aa0c1c8f48f6b209c592d19c (patch)
treee2823b5d7c2e3d740f9ecb810ddfff9ad6d7896a /arch
parentf5396f2d826823b16de5d2cef6f46ffc66712482 (diff)
downloadlinux-3e067fd8503d6205aa0c1c8f48f6b209c592d19c.tar.xz
KVM: x86: move guest_pv_has out of user_access section
When UBSAN is enabled, the code emitted for the call to guest_pv_has includes a call to __ubsan_handle_load_invalid_value. objtool complains that this call happens with UACCESS enabled; to avoid the warning, pull the calls to user_access_begin into both arms of the "if" statement, after the check for guest_pv_has. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dd7b8b465675..dc7eb5fddfd3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3292,9 +3292,6 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
}
st = (struct kvm_steal_time __user *)ghc->hva;
- if (!user_access_begin(st, sizeof(*st)))
- return;
-
/*
* Doing a TLB flush here, on the guest's behalf, can avoid
* expensive IPIs.
@@ -3303,6 +3300,9 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
u8 st_preempted = 0;
int err = -EFAULT;
+ if (!user_access_begin(st, sizeof(*st)))
+ return;
+
asm volatile("1: xchgb %0, %2\n"
"xor %1, %1\n"
"2:\n"
@@ -3325,6 +3325,9 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
if (!user_access_begin(st, sizeof(*st)))
goto dirty;
} else {
+ if (!user_access_begin(st, sizeof(*st)))
+ return;
+
unsafe_put_user(0, &st->preempted, out);
vcpu->arch.st.preempted = 0;
}