diff mbox

[23/31] mips/kvm: Hook into CP unusable exception handler.

Message ID 1370646215-6543-24-git-send-email-ddaney.cavm@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

David Daney June 7, 2013, 11:03 p.m. UTC 
From: David Daney <david.daney@cavium.com>

The MIPS VZ KVM code needs this to be able to manage the FPU.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 arch/mips/kernel/traps.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Ralf Baechle June 16, 2013, 11:28 a.m. UTC | #1 
On Fri, Jun 07, 2013 at 04:03:27PM -0700, David Daney wrote:

> From: David Daney <david.daney@cavium.com>
> 
> The MIPS VZ KVM code needs this to be able to manage the FPU.
> 
> Signed-off-by: David Daney <david.daney@cavium.com>

Looks good, Acked-by: Ralf Baechle <ralf@linux-mips.org>.

However I get cold shivers at the thought of SMTC FPU management with VZ,
it sounds like a source of new entertainment ...  But thinkin gaobu this
is something for another rainy day, not now.

  Ralf
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diff mbox

Patch

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index fca0a2f..2bdeb32 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -56,6 +56,7 @@ 
 #include <asm/types.h>
 #include <asm/stacktrace.h>
 #include <asm/uasm.h>
+#include <asm/kvm_mips_vz.h>
 
 extern void check_wait(void);
 extern asmlinkage void rollback_handle_int(void);
@@ -1045,6 +1046,13 @@  asmlinkage void do_cpu(struct pt_regs *regs)
 	int status;
 	unsigned long __maybe_unused flags;
 
+#ifdef CONFIG_KVM_MIPSVZ
+	if (test_tsk_thread_flag(current, TIF_GUESTMODE)) {
+		if (mipsvz_cp_unusable(regs))
+			return;
+	}
+#endif
+
 	die_if_kernel("do_cpu invoked from kernel context!", regs);
 
 	cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;