On 01/15/2014 10:11 AM, James Hogan wrote:
When KVM is enabled and TLB invalidation is supported, kvm_mips_flush_host_tlb() can cause a machine check exception due to multiple matching TLB entries. This can occur on shutdown even when KVM hasn't been actively used. Commit adb78de9eae8 (MIPS: mm: Move UNIQUE_ENTRYHI macro to a header file) created a common UNIQUE_ENTRYHI in asm/tlb.h but it didn't update the copy of UNIQUE_ENTRYHI in kvm_tlb.c to use it. Commit 36b175451399 (MIPS: tlb: Set the EHINV bit for TLBINVF cores when invalidating the TLB) later added TLB invalidation (EHINV) support to the common UNIQUE_ENTRYHI. Therefore make kvm_tlb.c use the EHINV aware UNIQUE_ENTRYHI implementation in asm/tlb.h too. Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: Gleb Natapov <gleb@xxxxxxxxxx> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: kvm@xxxxxxxxxxxxxxx Cc: Markos Chandras <markos.chandras@xxxxxxxxxx> Cc: Sanjay Lal <sanjayl@xxxxxxxxxxx> --- This is based on John Crispin's mips-next-3.14 branch. I do not object to it being squashed into commit adb78de9eae8 (MIPS: mm: Move UNIQUE_ENTRYHI macro to a header file) since that commit hasn't reached mainline yet. --- arch/mips/kvm/kvm_tlb.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c index c777dd36d4a8..52083ea7fddd 100644 --- a/arch/mips/kvm/kvm_tlb.c +++ b/arch/mips/kvm/kvm_tlb.c @@ -25,6 +25,7 @@ #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/cacheflush.h> +#include <asm/tlb.h> #undef CONFIG_MIPS_MT #include <asm/r4kcache.h> @@ -35,9 +36,6 @@ #define PRIx64 "llx" -/* Use VZ EntryHi.EHINV to invalidate TLB entries */ -#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1))) - atomic_t kvm_mips_instance; EXPORT_SYMBOL(kvm_mips_instance);
Thanks. That looks good to me. Reviewed-by: Markos Chandras <markos.chandras@xxxxxxxxxx> -- markos
