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| author | Sean Christopherson <seanjc@google.com> | 2021-04-21 19:21:26 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-26 05:27:12 -0400 |
| commit | 6b48fd4cb206485c357420d91ea766ef81b20dc3 (patch) | |
| tree | 0b659aa59f2b32e3b336e1601d08671b6461d218 | |
| parent | 82277eeed65eed6c6ee5b8f97bd978763eab148f (diff) | |
| download | linux-6b48fd4cb206485c357420d91ea766ef81b20dc3.tar.gz linux-6b48fd4cb206485c357420d91ea766ef81b20dc3.tar.bz2 linux-6b48fd4cb206485c357420d91ea766ef81b20dc3.zip | |
KVM: x86/xen: Drop RAX[63:32] when processing hypercall
Truncate RAX to 32 bits, i.e. consume EAX, when retrieving the hypecall
index for a Xen hypercall. Per Xen documentation[*], the index is EAX
when the vCPU is not in 64-bit mode.
[*] http://xenbits.xenproject.org/docs/sphinx-unstable/guest-guide/x86/hypercall-abi.html
Fixes: 23200b7a30de ("KVM: x86/xen: intercept xen hypercalls if enabled")
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210422022128.3464144-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/xen.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index ae17250e1efe..7f27bb65a572 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -673,7 +673,7 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) bool longmode; u64 input, params[6]; - input = (u64)kvm_register_read(vcpu, VCPU_REGS_RAX); + input = (u64)kvm_register_readl(vcpu, VCPU_REGS_RAX); /* Hyper-V hypercalls get bit 31 set in EAX */ if ((input & 0x80000000) && |