KVM: PPC: Book3S HV: Handle host system reset in guest mode

If the host takes a system reset interrupt while a guest is running,
the CPU must exit the guest before processing the host exception
handler.

After this patch, taking a sysrq+x with a CPU running in a guest
gives a trace like this:

   cpu 0x27: Vector: 100 (System Reset) at [c000000fdf5776f0]
       pc: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       lr: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       sp: c000000fdf577850
      msr: 9000000002803033
     current = 0xc000000fdf4b1e00
     paca    = 0xc00000000fd4d680	 softe: 3	 irq_happened: 0x01
       pid   = 6608, comm = qemu-system-ppc
   Linux version 4.14.0-rc7-01489-g47e1893a404a-dirty #26 SMP
   [c000000fdf577a00] c008000010159dd4 kvmppc_vcpu_run_hv+0x3dc/0x12d0 [kvm_hv]
   [c000000fdf577b30] c0080000100a537c kvmppc_vcpu_run+0x44/0x60 [kvm]
   [c000000fdf577b60] c0080000100a1ae0 kvm_arch_vcpu_ioctl_run+0x118/0x310 [kvm]
   [c000000fdf577c00] c008000010093e98 kvm_vcpu_ioctl+0x530/0x7c0 [kvm]
   [c000000fdf577d50] c000000000357bf8 do_vfs_ioctl+0xd8/0x8c0
   [c000000fdf577df0] c000000000358448 SyS_ioctl+0x68/0x100
   [c000000fdf577e30] c00000000000b220 system_call+0x58/0x6c
   --- Exception: c01 (System Call) at 00007fff76868df0
   SP (7fff7069baf0) is in userspace

Fixes: e36d0a2ed5 ("powerpc/powernv: Implement NMI IPI with OPAL_SIGNAL_SYSTEM_RESET")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index c1dd1929342d6381b6e5df9649dc1bb5aadcde85..d2ef3611151824f78846ef81723f77a47071a9f8 100644 (file)
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -31,6 +31,7 @@
 
 #ifndef __ASSEMBLY__
 
+extern void replay_system_reset(void);
 extern void __replay_interrupt(unsigned int vector);
 
 extern void timer_interrupt(struct pt_regs *);

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index d001aa4c69a1524b104b8b2de81285983bd3503f..64c2bc35e4ff21ba69cf607411ce288838a8882e 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -113,6 +113,7 @@ EXC_VIRT_NONE(0x4000, 0x100)
        cmpwi   cr3,r10,2 ;                                             \
        BRANCH_TO_C000(r10, system_reset_idle_common) ;                 \
 1:                                                                     \
+       KVMTEST_PR(n) ;                                                 \
        END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
 #else
 #define IDLETEST NOTEST
@@ -129,6 +130,7 @@ EXC_REAL_BEGIN(system_reset, 0x100, 0x100)
 
 EXC_REAL_END(system_reset, 0x100, 0x100)
 EXC_VIRT_NONE(0x4100, 0x100)
+TRAMP_KVM(PACA_EXNMI, 0x100)
 
 #ifdef CONFIG_PPC_P7_NAP
 EXC_COMMON_BEGIN(system_reset_idle_common)

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 4813b83b22aa61edad3098b4847a86e461210f52..6a6995173f5186872abff03d8fafd84cd23408b9 100644 (file)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -415,7 +415,7 @@ static const u8 srr1_to_lazyirq[0x10] = {
        PACA_IRQ_HMI,
        0, 0, 0, 0, 0 };
 
-static noinline void replay_system_reset(void)
+void replay_system_reset(void)
 {
        struct pt_regs regs;
 
@@ -425,6 +425,7 @@ static noinline void replay_system_reset(void)
        system_reset_exception(&regs);
        get_paca()->in_nmi = 0;
 }
+EXPORT_SYMBOL_GPL(replay_system_reset);
 
 void irq_set_pending_from_srr1(unsigned long srr1)
 {

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 8f34715cfbff489ba37f763acf1e370b5fe6b5b4..31a362669fea1104b6cc1a8bd794f3209a77fc53 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -47,6 +47,7 @@
 
 #include <asm/reg.h>
 #include <asm/ppc-opcode.h>
+#include <asm/asm-prototypes.h>
 #include <asm/disassemble.h>
 #include <asm/cputable.h>
 #include <asm/cacheflush.h>
@@ -1089,9 +1090,10 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
                vcpu->stat.ext_intr_exits++;
                r = RESUME_GUEST;
                break;
-       /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
+       /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
        case BOOK3S_INTERRUPT_HMI:
        case BOOK3S_INTERRUPT_PERFMON:
+       case BOOK3S_INTERRUPT_SYSTEM_RESET:
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_MACHINE_CHECK:
@@ -2604,6 +2606,9 @@ static void set_irq_happened(int trap)
        case BOOK3S_INTERRUPT_HMI:
                local_paca->irq_happened |= PACA_IRQ_HMI;
                break;
+       case BOOK3S_INTERRUPT_SYSTEM_RESET:
+               replay_system_reset();
+               break;
        }
 }