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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
	Wei Huang <whuang2@amd.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH RFC 2/2] KVM: x86: bump KVM_MAX_CPUID_ENTRIES
Date: Tue, 15 Sep 2020 17:43:06 +0200	[thread overview]
Message-ID: <20200915154306.724953-3-vkuznets@redhat.com> (raw)
In-Reply-To: <20200915154306.724953-1-vkuznets@redhat.com>

As vcpu->arch.cpuid_entries is now allocated dynamically, the only
remaining use for KVM_MAX_CPUID_ENTRIES is to check KVM_SET_CPUID/
KVM_SET_CPUID2 input for sanity. Since it was reported that the
current limit (80) is insufficient for some CPUs, bump
KVM_MAX_CPUID_ENTRIES and use an arbitrary value '256' as the new
limit.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0c5f2ca3e838..c1d942c9eb58 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -132,7 +132,7 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
 #define KVM_MIN_FREE_MMU_PAGES 5
 #define KVM_REFILL_PAGES 25
-#define KVM_MAX_CPUID_ENTRIES 80
+#define KVM_MAX_CPUID_ENTRIES 256
 #define KVM_NR_FIXED_MTRR_REGION 88
 #define KVM_NR_VAR_MTRR 8
 
-- 
2.25.4


  parent reply	other threads:[~2020-09-15 22:50 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 15:43 [PATCH RFC 0/2] KVM: x86: allow for more CPUID entries Vitaly Kuznetsov
2020-09-15 15:43 ` [PATCH RFC 1/2] KVM: x86: allocate vcpu->arch.cpuid_entries dynamically Vitaly Kuznetsov
2020-09-18  2:41   ` Sean Christopherson
2020-10-01 10:04     ` Vitaly Kuznetsov
2020-09-15 15:43 ` Vitaly Kuznetsov [this message]
2020-09-15 16:51 ` [PATCH RFC 0/2] KVM: x86: allow for more CPUID entries Dr. David Alan Gilbert
2020-09-16  3:49   ` Wei Huang
2020-09-16  7:44     ` Vitaly Kuznetsov
2020-09-16  8:33     ` Dr. David Alan Gilbert
2020-09-16 19:22       ` Wei Huang

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