From 2e8cd7a3b82874e9cb3e42d916dda05cd790cc1a Mon Sep 17 00:00:00 2001 From: Like Xu Date: Wed, 24 Jun 2020 09:59:28 +0800 Subject: kvm: x86: limit the maximum number of vPMU fixed counters to 3 Some new Intel platforms (such as TGL) already have the fourth fixed counter TOPDOWN.SLOTS, but it has not been fully enabled on KVM and the host. Therefore, we limit edx.split.num_counters_fixed to 3, so that it does not break the kvm-unit-tests PMU test case and bad-handled userspace. Signed-off-by: Like Xu Message-Id: <20200624015928.118614-1-like.xu@linux.intel.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kvm/cpuid.c') diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 5bec182aa648..6f2b6e9c9ae0 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -606,7 +606,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) eax.split.bit_width = cap.bit_width_gp; eax.split.mask_length = cap.events_mask_len; - edx.split.num_counters_fixed = cap.num_counters_fixed; + edx.split.num_counters_fixed = min(cap.num_counters_fixed, MAX_FIXED_COUNTERS); edx.split.bit_width_fixed = cap.bit_width_fixed; edx.split.reserved = 0; -- cgit v1.2.3