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KVM: PPC: Book3S HV: Save/restore host PMU registers that are new in POWER8

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Currently we save the host PMU configuration, counter values, etc.,
when entering a guest, and restore it on return from the guest.
(We have to do this because the guest has control of the PMU while
it is executing.)  However, we missed saving/restoring the SIAR and
SDAR registers, as well as the registers which are new on POWER8,
namely SIER and MMCR2.

This adds code to save the values of these registers when entering
the guest and restore them on exit.  This also works around the bug
in POWER8 where setting PMAE with a counter already negative doesn't
generate an interrupt.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Paul Mackerras 2014-03-25 10:47:08 +11:00
parent c5fb80d3b2
commit 72cde5a88d
3 changed files with 33 additions and 1 deletions
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2
arch/powerpc/include/asm/kvm_book3s_asm.h
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@ -94,7 +94,7 @@ struct kvmppc_host_state {
unsigned long xics_phys;
u32 saved_xirr;
u64 dabr;
u64 host_mmcr[3];
u64 host_mmcr[7]; /* MMCR 0,1,A, SIAR, SDAR, MMCR2, SIER */
u32 host_pmc[8];
u64 host_purr;
u64 host_spurr;