KVM: VMX: Add helper to check if the guest PMU has PERF_GLOBAL_CTRL

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[ Upstream commit b663f0b5f3 ]

Add a helper to check of the guest PMU has PERF_GLOBAL_CTRL, which is
unintuitive _and_ diverges from Intel's architecturally defined behavior.
Even worse, KVM currently implements the check using two different (but
equivalent) checks, _and_ there has been at least one attempt to add a
_third_ flavor.

Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220722224409.1336532-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Sean Christopherson 2022-07-22 22:44:07 +00:00 • committed by Greg Kroah-Hartman

parent c08044267e

commit 9863e9fc8a

2 changed files with 14 additions and 2 deletions

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4

arch/x86/kvm/vmx/pmu_intel.c

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12

arch/x86/kvm/vmx/vmx.h

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