linux-kernel - [PATCH 3.16 061/125] Revert "KVM: x86: Increase the number of fixed MTRR regs to 10"

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Message-Id: <20140903220625.520552441@linuxfoundation.org>
Date:	Wed,  3 Sep 2014 15:06:58 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 3.16 061/125] Revert "KVM: x86: Increase the number of fixed MTRR regs to 10"

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@...hat.com>

commit 0d234daf7e0a3290a3a20c8087eefbd6335a5bd4 upstream.

This reverts commit 682367c494869008eb89ef733f196e99415ae862,
which causes 32-bit SMP Windows 7 guests to panic.

SeaBIOS has a limit on the number of MTRRs that it can handle,
and this patch exceeded the limit.  Better revert it.
Thanks to Nadav Amit for debugging the cause.

Reported-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/kvm_host.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -95,7 +95,7 @@ static inline gfn_t gfn_to_index(gfn_t g
 #define KVM_REFILL_PAGES 25
 #define KVM_MAX_CPUID_ENTRIES 80
 #define KVM_NR_FIXED_MTRR_REGION 88
-#define KVM_NR_VAR_MTRR 10
+#define KVM_NR_VAR_MTRR 8
 
 #define ASYNC_PF_PER_VCPU 64
 


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