Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull second batch of kvm updates from Paolo Bonzini:
 "Four changes:

   - x86: work around two nasty cases where a benign exception occurs
     while another is being delivered.  The endless stream of exceptions
     causes an infinite loop in the processor, which not even NMIs or
     SMIs can interrupt; in the virt case, there is no possibility to
     exit to the host either.

   - x86: support for Skylake per-guest TSC rate.  Long supported by
     AMD, the patches mostly move things from there to common
     arch/x86/kvm/ code.

   - generic: remove local_irq_save/restore from the guest entry and
     exit paths when context tracking is enabled.  The patches are a few
     months old, but we discussed them again at kernel summit.  Andy
     will pick up from here and, in 4.5, try to remove it from the user
     entry/exit paths.

   - PPC: Two bug fixes, see merge commit 370289756becc for details"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
  KVM: x86: rename update_db_bp_intercept to update_bp_intercept
  KVM: svm: unconditionally intercept #DB
  KVM: x86: work around infinite loop in microcode when #AC is delivered
  context_tracking: avoid irq_save/irq_restore on guest entry and exit
  context_tracking: remove duplicate enabled check
  KVM: VMX: Dump TSC multiplier in dump_vmcs()
  KVM: VMX: Use a scaled host TSC for guest readings of MSR_IA32_TSC
  KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded
  KVM: VMX: Enable and initialize VMX TSC scaling
  KVM: x86: Use the correct vcpu's TSC rate to compute time scale
  KVM: x86: Move TSC scaling logic out of call-back read_l1_tsc()
  KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset()
  KVM: x86: Replace call-back compute_tsc_offset() with a common function
  KVM: x86: Replace call-back set_tsc_khz() with a common function
  KVM: x86: Add a common TSC scaling function
  KVM: x86: Add a common TSC scaling ratio field in kvm_vcpu_arch
  KVM: x86: Collect information for setting TSC scaling ratio
  KVM: x86: declare a few variables as __read_mostly
  KVM: x86: merge handle_mmio_page_fault and handle_mmio_page_fault_common
  KVM: PPC: Book3S HV: Don't dynamically split core when already split
  ...

2 files changed, 13 insertions, 9 deletions

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 9c26c5a96ea2..54b45b73195f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2019,7 +2019,7 @@ static bool can_split_piggybacked_subcores(struct core_info *cip)
 			return false;
 		n_subcores += (cip->subcore_threads[sub] - 1) >> 1;
 	}
-	if (n_subcores > 3 || large_sub < 0)
+	if (large_sub < 0 || !subcore_config_ok(n_subcores + 1, 2))
 		return false;
 
 	/*
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index b1dab8d1d885..3c6badcd53ef 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1749,7 +1749,8 @@ kvmppc_hdsi:
 	beq	3f
 	clrrdi	r0, r4, 28
 	PPC_SLBFEE_DOT(R5, R0)		/* if so, look up SLB */
-	bne	1f			/* if no SLB entry found */
+	li	r0, BOOK3S_INTERRUPT_DATA_SEGMENT
+	bne	7f			/* if no SLB entry found */
 4:	std	r4, VCPU_FAULT_DAR(r9)
 	stw	r6, VCPU_FAULT_DSISR(r9)
 
@@ -1768,14 +1769,15 @@ kvmppc_hdsi:
 	cmpdi	r3, -2			/* MMIO emulation; need instr word */
 	beq	2f
 
-	/* Synthesize a DSI for the guest */
+	/* Synthesize a DSI (or DSegI) for the guest */
 	ld	r4, VCPU_FAULT_DAR(r9)
 	mr	r6, r3
-1:	mtspr	SPRN_DAR, r4
+1:	li	r0, BOOK3S_INTERRUPT_DATA_STORAGE
 	mtspr	SPRN_DSISR, r6
+7:	mtspr	SPRN_DAR, r4
 	mtspr	SPRN_SRR0, r10
 	mtspr	SPRN_SRR1, r11
-	li	r10, BOOK3S_INTERRUPT_DATA_STORAGE
+	mr	r10, r0
 	bl	kvmppc_msr_interrupt
 fast_interrupt_c_return:
 6:	ld	r7, VCPU_CTR(r9)
@@ -1823,7 +1825,8 @@ kvmppc_hisi:
 	beq	3f
 	clrrdi	r0, r10, 28
 	PPC_SLBFEE_DOT(R5, R0)		/* if so, look up SLB */
-	bne	1f			/* if no SLB entry found */
+	li	r0, BOOK3S_INTERRUPT_INST_SEGMENT
+	bne	7f			/* if no SLB entry found */
 4:
 	/* Search the hash table. */
 	mr	r3, r9			/* vcpu pointer */
@@ -1840,11 +1843,12 @@ kvmppc_hisi:
 	cmpdi	r3, -1			/* handle in kernel mode */
 	beq	guest_exit_cont
 
-	/* Synthesize an ISI for the guest */
+	/* Synthesize an ISI (or ISegI) for the guest */
 	mr	r11, r3
-1:	mtspr	SPRN_SRR0, r10
+1:	li	r0, BOOK3S_INTERRUPT_INST_STORAGE
+7:	mtspr	SPRN_SRR0, r10
 	mtspr	SPRN_SRR1, r11
-	li	r10, BOOK3S_INTERRUPT_INST_STORAGE
+	mr	r10, r0
 	bl	kvmppc_msr_interrupt
 	b	fast_interrupt_c_return