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

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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>
This commit is contained in:
Nicholas Piggin 2017-11-05 23:33:55 +11:00 committed by Michael Ellerman
parent 4dd9eab39c
commit 6de6638b35
4 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/include/asm/hw_irq.h
View File

@ -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 *);

2
arch/powerpc/kernel/exceptions-64s.S
View File

@ -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)

3
arch/powerpc/kernel/irq.c
View File

@ -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)
{

7
arch/powerpc/kvm/book3s_hv.c
View File

@ -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;
}
}