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Nicholas Piggin 1782663897 KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live 
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
2021-08-25 16:37:18 +10:00
..
boot powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
configs TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live 2021-08-25 16:37:18 +10:00
kernel powerpc fixes for 5.14 #2 2021-07-09 10:26:52 -07:00
kexec powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
kvm KVM: PPC: Book3S HV Nested: Reflect guest PMU in-use to L0 when guest SPRs are live 2021-08-25 16:37:18 +10:00
lib powerpc: Only build restart_table.c for 64s 2021-07-01 22:50:54 +10:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc fixes for 5.14 #2 2021-07-09 10:26:52 -07:00
net powerpc/bpf: Reject atomic ops in ppc32 JIT 2021-07-05 22:23:25 +10:00
perf powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
platforms powerpc/smp: Fix fall-through warning for Clang 2021-07-14 11:10:40 -05:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xive: Fix error handling when allocating an IPI 2021-07-05 22:23:25 +10:00
tools
xmon powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kbuild
Kconfig powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kconfig.debug powerpc: Make PPC_IRQ_SOFT_MASK_DEBUG depend on PPC64 2021-06-25 00:07:09 +10:00
Makefile Kbuild updates for v5.14 2021-07-10 11:01:38 -07:00
Makefile.postlink