Nicholas Piggin d05b4290c1 KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live ... [ Upstream commit 1782663897 ] After the L1 saves its PMU SPRs but before loading the L2's PMU SPRs, switch the pmcregs_in_use field in the L1 lppaca to the value advertised by the L2 in its VPA. On the way out of the L2, set it back after saving the L2 PMU registers (if they were in-use). This transfers the PMU liveness indication between the L1 and L2 at the points where the registers are not live. This fixes the nested HV bug for which a workaround was added to the L0 HV by commit 63279eeb7f ("KVM: PPC: Book3S HV: Always save guest pmu for guest capable of nesting"), which explains the problem in detail. That workaround is no longer required for guests that include this bug fix. Fixes: 360cae3137 ("KVM: PPC: Book3S HV: Nested guest entry via hypercall") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com> Link: https://lore.kernel.org/r/20210811160134.904987-10-npiggin@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-09-18 13:43:32 +02:00
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asm	KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live	2021-09-18 13:43:32 +02:00
uapi/asm	powerpc/papr_scm: Add support for reporting dirty-shutdown-count	2021-06-25 14:47:18 +10:00