linux-kernel - [PATCH 4.19 075/267] KVM: MIPS: Fix VPN2_MASK definition for variable cpu

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Date:   Fri, 19 Jun 2020 16:31:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Xing Li <lixing@...ngson.cn>, Huacai Chen <chenhc@...ote.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 4.19 075/267] KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits

From: Xing Li <lixing@...ngson.cn>

commit 5816c76dea116a458f1932eefe064e35403248eb upstream.

If a CPU support more than 32bit vmbits (which is true for 64bit CPUs),
VPN2_MASK set to fixed 0xffffe000 will lead to a wrong EntryHi in some
functions such as _kvm_mips_host_tlb_inv().

The cpu_vmbits definition of 32bit CPU in cpu-features.h is 31, so we
still use the old definition.

Cc: Stable <stable@...r.kernel.org>
Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@...il.com>
Signed-off-by: Xing Li <lixing@...ngson.cn>
[Huacai: Improve commit messages]
Signed-off-by: Huacai Chen <chenhc@...ote.com>
Message-Id: <1590220602-3547-3-git-send-email-chenhc@...ote.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/include/asm/kvm_host.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -274,7 +274,11 @@ enum emulation_result {
 #define MIPS3_PG_SHIFT		6
 #define MIPS3_PG_FRAME		0x3fffffc0
 
+#if defined(CONFIG_64BIT)
+#define VPN2_MASK		GENMASK(cpu_vmbits - 1, 13)
+#else
 #define VPN2_MASK		0xffffe000
+#endif
 #define KVM_ENTRYHI_ASID	cpu_asid_mask(&boot_cpu_data)
 #define TLB_IS_GLOBAL(x)	((x).tlb_lo[0] & (x).tlb_lo[1] & ENTRYLO_G)
 #define TLB_VPN2(x)		((x).tlb_hi & VPN2_MASK)