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KVM: x86: hyper-v: Fix the maximum number of sparse banks for XMM fast TLB flush hypercalls 

When TLB flush hypercalls (HVCALL_FLUSH_VIRTUAL_ADDRESS_{LIST,SPACE}_EX are
issued in 'XMM fast' mode, the maximum number of allowed sparse_banks is
not 'HV_HYPERCALL_MAX_XMM_REGISTERS - 1' (5) but twice as many (10) as each
XMM register is 128 bit long and can hold two 64 bit long banks.

Cc: stable@vger.kernel.org # 5.14.x
Fixes: 5974565bc2 ("KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220222154642.684285-4-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-02-22 16:46:41 +01:00 committed by Paolo Bonzini
parent 82c1ead0d6
commit 7321f47ead
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/hyperv.c
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@ -1819,7 +1819,8 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
if (!all_cpus) {
if (hc->fast) {
if (sparse_banks_len > HV_HYPERCALL_MAX_XMM_REGISTERS - 1)
/* XMM0 is already consumed, each XMM holds two sparse banks. */
if (sparse_banks_len > 2 * (HV_HYPERCALL_MAX_XMM_REGISTERS - 1))
return HV_STATUS_INVALID_HYPERCALL_INPUT;
for (i = 0; i < sparse_banks_len; i += 2) {
sparse_banks[i] = sse128_lo(hc->xmm[i / 2 + 1]);