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KVM: PPC: Book3S HV: Stop using vc->dpdes for nested KVM guests

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[ Upstream commit 0d3c6b2889 ]

commit 6398326b9b ("KVM: PPC: Book3S HV P9: Stop using vc->dpdes")
introduced an optimization to use only vcpu->doorbell_request for SMT
emulation for Power9 and above guests, but the code for nested guests
still relies on the old way of handling doorbells, due to which an L2
guest (see [1]) cannot be booted with XICS with SMT>1. The command to
repro this issue is:

// To be run in L1

qemu-system-ppc64 \
	-drive file=rhel.qcow2,format=qcow2 \
	-m 20G \
	-smp 8,cores=1,threads=8 \
	-cpu  host \
	-nographic \
	-machine pseries,ic-mode=xics -accel kvm

Fix the plumbing to utilize vcpu->doorbell_request instead of vcore->dpdes
for nested KVM guests on P9 and above.

[1] Terminology
1. L0 : PowerNV linux running with HV privileges
2. L1 : Pseries KVM guest running on top of L0
2. L2 : Nested KVM guest running on top of L1

Fixes: 6398326b9b ("KVM: PPC: Book3S HV P9: Stop using vc->dpdes")
Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241109063301.105289-3-gautam@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gautam Menghani
2024-11-09 12:02:56 +05:30
committed by Greg Kroah-Hartman
parent a6faea503b
commit e7d134bd28
2 changed files with 19 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/powerpc/kvm/book3s_hv.c
+9
View File
@@ -4090,6 +4090,15 @@ static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, uns
}
hvregs.hdec_expiry = time_limit;
/*
* hvregs has the doorbell status, so zero it here which
* enables us to receive doorbells when H_ENTER_NESTED is
* in progress for this vCPU
*/
if (vcpu->arch.doorbell_request)
vcpu->arch.doorbell_request = 0;
/*
* When setting DEC, we must always deal with irq_work_raise
* via NMI vs setting DEC. The problem occurs right as we
arch/powerpc/kvm/book3s_hv_nested.c
+10 -4
View File
@@ -32,7 +32,7 @@ void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
struct kvmppc_vcore *vc = vcpu->arch.vcore;
hr->pcr = vc->pcr | PCR_MASK;
hr->dpdes = vc->dpdes;
hr->dpdes = vcpu->arch.doorbell_request;
hr->hfscr = vcpu->arch.hfscr;
hr->tb_offset = vc->tb_offset;
hr->dawr0 = vcpu->arch.dawr0;
@@ -105,7 +105,7 @@ static void save_hv_return_state(struct kvm_vcpu *vcpu,
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
hr->dpdes = vc->dpdes;
hr->dpdes = vcpu->arch.doorbell_request;
hr->purr = vcpu->arch.purr;
hr->spurr = vcpu->arch.spurr;
hr->ic = vcpu->arch.ic;
@@ -143,7 +143,7 @@ static void restore_hv_regs(struct kvm_vcpu *vcpu, const struct hv_guest_state *
struct kvmppc_vcore *vc = vcpu->arch.vcore;
vc->pcr = hr->pcr | PCR_MASK;
vc->dpdes = hr->dpdes;
vcpu->arch.doorbell_request = hr->dpdes;
vcpu->arch.hfscr = hr->hfscr;
vcpu->arch.dawr0 = hr->dawr0;
vcpu->arch.dawrx0 = hr->dawrx0;
@@ -170,7 +170,13 @@ void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
vc->dpdes = hr->dpdes;
/*
* This L2 vCPU might have received a doorbell while H_ENTER_NESTED was being handled.
* Make sure we preserve the doorbell if it was either:
* a) Sent after H_ENTER_NESTED was called on this vCPU (arch.doorbell_request would be 1)
* b) Doorbell was not handled and L2 exited for some other reason (hr->dpdes would be 1)
*/
vcpu->arch.doorbell_request = vcpu->arch.doorbell_request | hr->dpdes;
vcpu->arch.hfscr = hr->hfscr;
vcpu->arch.purr = hr->purr;
vcpu->arch.spurr = hr->spurr;