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| author | Paul Mackerras <paulus@ozlabs.org> | 2019-08-26 08:21:21 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2019-08-27 03:45:49 +0200 |
| commit | 2ad7a27deaf6d78545d97ab80874584f6990360e (patch) | |
| tree | afadf8ab79c6a31384a9467761779a3d6dd80f57 /arch/powerpc/include/asm/xive.h | |
| parent | KVM: PPC: Book3S HV: Define usage types for rmap array in guest memslot (diff) | |
| download | linux-2ad7a27deaf6d78545d97ab80874584f6990360e.tar.xz linux-2ad7a27deaf6d78545d97ab80874584f6990360e.zip | |
KVM: PPC: Book3S: Enable XIVE native capability only if OPAL has required functions
There are some POWER9 machines where the OPAL firmware does not support
the OPAL_XIVE_GET_QUEUE_STATE and OPAL_XIVE_SET_QUEUE_STATE calls.
The impact of this is that a guest using XIVE natively will not be able
to be migrated successfully. On the source side, the get_attr operation
on the KVM native device for the KVM_DEV_XIVE_GRP_EQ_CONFIG attribute
will fail; on the destination side, the set_attr operation for the same
attribute will fail.
This adds tests for the existence of the OPAL get/set queue state
functions, and if they are not supported, the XIVE-native KVM device
is not created and the KVM_CAP_PPC_IRQ_XIVE capability returns false.
Userspace can then either provide a software emulation of XIVE, or
else tell the guest that it does not have a XIVE controller available
to it.
Cc: stable@vger.kernel.org # v5.2+
Fixes: 3fab2d10588e ("KVM: PPC: Book3S HV: XIVE: Activate XIVE exploitation mode")
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include/asm/xive.h')
| -rw-r--r-- | arch/powerpc/include/asm/xive.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h index efb0e597b272..818989e11678 100644 --- a/arch/powerpc/include/asm/xive.h +++ b/arch/powerpc/include/asm/xive.h @@ -135,6 +135,7 @@ extern int xive_native_get_queue_state(u32 vp_id, uint32_t prio, u32 *qtoggle, extern int xive_native_set_queue_state(u32 vp_id, uint32_t prio, u32 qtoggle, u32 qindex); extern int xive_native_get_vp_state(u32 vp_id, u64 *out_state); +extern bool xive_native_has_queue_state_support(void); #else |