[PATCH AUTOSEL 5.4 22/40] ibmvnic: continue to init in CRQ reset returns H_CLOSED

[PATCH AUTOSEL 5.4 22/40] ibmvnic: continue to init in CRQ reset returns H_CLOSED

[Sasha Levin]

From: Dany Madden <drt@linux.ibm.com>

[ Upstream commit 8b40eb73509f5704a0e8cd25de0163876299f1a7 ]

Continue the reset path when partner adapter is not ready or H_CLOSED is
returned from reset crq. This patch allows the CRQ init to proceed to
establish a valid CRQ for traffic to flow after reset.

Signed-off-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 5a42ddeecfe50..143a9722ad11a 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1865,13 +1865,18 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 			release_sub_crqs(adapter, 1);
 		} else {
 			rc = ibmvnic_reset_crq(adapter);
-			if (!rc)
+			if (rc == H_CLOSED || rc == H_SUCCESS) {
 				rc = vio_enable_interrupts(adapter->vdev);
+				if (rc)
+					netdev_err(adapter->netdev,
+						   "Reset failed to enable interrupts. rc=%d\n",
+						   rc);
+			}
 		}
 
 		if (rc) {
 			netdev_err(adapter->netdev,
-				   "Couldn't initialize crq. rc=%d\n", rc);
+				   "Reset couldn't initialize crq. rc=%d\n", rc);
 			goto out;
 		}
 
-- 
2.25.1

[PATCH AUTOSEL 5.4 23/40] powerpc/kvm/book3s64: Fix kernel crash with nested kvm & DEBUG_VIRTUAL

[Sasha Levin]

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>

[ Upstream commit c1ed1754f271f6b7acb1bfdc8cfb62220fbed423 ]

With CONFIG_DEBUG_VIRTUAL=y, __pa() checks for addr value and if it's
less than PAGE_OFFSET it leads to a BUG().

  #define __pa(x)
  ({
  	VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET);
  	(unsigned long)(x) & 0x0fffffffffffffffUL;
  })

  kernel BUG at arch/powerpc/kvm/book3s_64_mmu_radix.c:43!
  cpu 0x70: Vector: 700 (Program Check) at [c0000018a2187360]
      pc: c000000000161b30: __kvmhv_copy_tofrom_guest_radix+0x130/0x1f0
      lr: c000000000161d5c: kvmhv_copy_from_guest_radix+0x3c/0x80
  ...
  kvmhv_copy_from_guest_radix+0x3c/0x80
  kvmhv_load_from_eaddr+0x48/0xc0
  kvmppc_ld+0x98/0x1e0
  kvmppc_load_last_inst+0x50/0x90
  kvmppc_hv_emulate_mmio+0x288/0x2b0
  kvmppc_book3s_radix_page_fault+0xd8/0x2b0
  kvmppc_book3s_hv_page_fault+0x37c/0x1050
  kvmppc_vcpu_run_hv+0xbb8/0x1080
  kvmppc_vcpu_run+0x34/0x50
  kvm_arch_vcpu_ioctl_run+0x2fc/0x410
  kvm_vcpu_ioctl+0x2b4/0x8f0
  ksys_ioctl+0xf4/0x150
  sys_ioctl+0x28/0x80
  system_call_exception+0x104/0x1d0
  system_call_common+0xe8/0x214

kvmhv_copy_tofrom_guest_radix() uses a NULL value for to/from to
indicate direction of copy.

Avoid calling __pa() if the value is NULL to avoid the BUG().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
[mpe: Massage change log a bit to mention CONFIG_DEBUG_VIRTUAL]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200611120159.680284-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/kvm/book3s_64_mmu_radix.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 43b56f8f6bebd..da8375437d161 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -38,7 +38,8 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
 	/* Can't access quadrants 1 or 2 in non-HV mode, call the HV to do it */
 	if (kvmhv_on_pseries())
 		return plpar_hcall_norets(H_COPY_TOFROM_GUEST, lpid, pid, eaddr,
-					  __pa(to), __pa(from), n);
+					  (to != NULL) ? __pa(to): 0,
+					  (from != NULL) ? __pa(from): 0, n);
 
 	quadrant = 1;
 	if (!pid)
-- 
2.25.1