[PATCH] powerpc/64s/exception: KVM Fix for host DSI being taken in HPT guest MMU context

[PATCH] powerpc/64s/exception: KVM Fix for host DSI being taken in HPT guest MMU context

[Nicholas Piggin]

Commit 2284ffea8f0c ("powerpc/64s/exception: Only test KVM in SRR
interrupts when PR KVM is supported") removed KVM guest tests from
interrupts that do not set HV=1, when PR-KVM is not configured.

This is wrong for HV-KVM HPT guest MMIO emulation case which attempts
to load the faulting instruction word with MSR[DR]=1 and MSR[HV]=1 with
the guest MMU context loaded. This can cause host DSI, DSLB interrupts
which must test for KVM guest. Restore this and add a comment.

Fixes: 2284ffea8f0c ("powerpc/64s/exception: Only test KVM in SRR interrupts when PR KVM is supported")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index f7d748b88705..b67892e2c9f5 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1412,6 +1412,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
  *   If none is found, do a Linux page fault. Linux page faults can happen in
  *   kernel mode due to user copy operations of course.
  *
+ *   KVM: The KVM HDSI handler may perform a load with MSR[DR]=1 in guest
+ *   MMU context, which may cause a DSI in the host, which must go to the
+ *   KVM handler. MSR[IR] is not enabled, so the real-mode handler will
+ *   always be used regardless of AIL setting.
+ *
  * - Radix MMU
  *   The hardware loads from the Linux page table directly, so a fault goes
  *   immediately to Linux page fault.
@@ -1422,10 +1427,8 @@ INT_DEFINE_BEGIN(data_access)
 	IVEC=0x300
 	IDAR=1
 	IDSISR=1
-#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 	IKVM_SKIP=1
 	IKVM_REAL=1
-#endif
 INT_DEFINE_END(data_access)
 
 EXC_REAL_BEGIN(data_access, 0x300, 0x80)
@@ -1464,6 +1467,8 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  *   ppc64_bolted_size (first segment). The kernel handler must avoid stomping
  *   on user-handler data structures.
  *
+ *   KVM: Same as 0x300, DSLB must test for KVM guest.
+ *
  * A dedicated save area EXSLB is used (XXX: but it actually need not be
  * these days, we could use EXGEN).
  */
@@ -1472,10 +1477,8 @@ INT_DEFINE_BEGIN(data_access_slb)
 	IAREA=PACA_EXSLB
 	IRECONCILE=0
 	IDAR=1
-#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 	IKVM_SKIP=1
 	IKVM_REAL=1
-#endif
 INT_DEFINE_END(data_access_slb)
 
 EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
-- 
2.23.0

Re: [PATCH] powerpc/64s/exception: KVM Fix for host DSI being taken in HPT guest MMU context

[Michael Ellerman]

On Tue, 17 Nov 2020 23:56:17 +1000, Nicholas Piggin wrote:
> Commit 2284ffea8f0c ("powerpc/64s/exception: Only test KVM in SRR
> interrupts when PR KVM is supported") removed KVM guest tests from
> interrupts that do not set HV=1, when PR-KVM is not configured.
> 
> This is wrong for HV-KVM HPT guest MMIO emulation case which attempts
> to load the faulting instruction word with MSR[DR]=1 and MSR[HV]=1 with
> the guest MMU context loaded. This can cause host DSI, DSLB interrupts
> which must test for KVM guest. Restore this and add a comment.

Applied to powerpc/fixes.

[1/1] powerpc/64s/exception: KVM Fix for host DSI being taken in HPT guest MMU context
      https://git.kernel.org/powerpc/c/cd81acc600a9684ea4b4d25a47900d38a3890eab

cheers