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KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED

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This patch introduces kvm_para_has_hint() to query for hints about
the configuration of the guests.  The first hint KVM_HINTS_DEDICATED,
is set if the guest has dedicated physical CPUs for each vCPU (i.e.
pinning and no over-commitment).  This allows optimizing spinlocks
and tells the guest to avoid PV TLB flush.

Cc: Paolo Bonzini <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Eduardo Habkost <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Radim Krčmář <[email protected]>
This commit is contained in:
Wanpeng Li 2018-02-13 09:05:40 +08:00 • committed by Radim Krčmář
commit a4429e53c9
9 changed files with 55 additions and 4 deletions
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15
Documentation/virtual/kvm/cpuid.txt
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@ -23,8 +23,8 @@ This function queries the presence of KVM cpuid leafs.
function: define KVM_CPUID_FEATURES (0x40000001)
returns : ebx, ecx, edx = 0
eax = and OR'ed group of (1 << flag), where each flags is:
returns : ebx, ecx
eax = an OR'ed group of (1 << flag), where each flags is:
flag || value || meaning
@ -66,3 +66,14 @@ KVM_FEATURE_CLOCKSOURCE_STABLE_BIT || 24 || host will warn if no guest-side
|| || per-cpu warps are expected in
|| || kvmclock.
------------------------------------------------------------------------------
edx = an OR'ed group of (1 << flag), where each flags is:
flag || value || meaning
==================================================================================
KVM_HINTS_DEDICATED || 0 || guest checks this feature bit to
|| || determine if there is vCPU pinning
|| || and there is no vCPU over-commitment,
|| || allowing optimizations
----------------------------------------------------------------------------------