From: Fabiano Rosas <farosas@linux.ibm.com>
To: Nicholas Piggin <npiggin@gmail.com>, qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org, "Nicholas Piggin" <npiggin@gmail.com>,
"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [PATCH 9/9] spapr: implement nested-hv capability for the virtual hypervisor
Date: Tue, 15 Feb 2022 13:01:38 -0300 [thread overview]
Message-ID: <87mtisxgnx.fsf@linux.ibm.com> (raw)
In-Reply-To: <20220215031642.1691873-10-npiggin@gmail.com>
Nicholas Piggin <npiggin@gmail.com> writes:
> This implements the Nested KVM HV hcall API for spapr under TCG.
>
> The L2 is switched in when the H_ENTER_NESTED hcall is made, and the
> L1 is switched back in returned from the hcall when a HV exception
> is sent to the vhyp. Register state is copied in and out according to
> the nested KVM HV hcall API specification.
>
> The hdecr timer is started when the L2 is switched in, and it provides
> the HDEC / 0x980 return to L1.
>
> The MMU re-uses the bare metal radix 2-level page table walker by
> using the get_pate method to point the MMU to the nested partition
> table entry. MMU faults due to partition scope errors raise HV
> exceptions and accordingly are routed back to the L1.
>
> The MMU does not tag translations for the L1 (direct) vs L2 (nested)
> guests, so the TLB is flushed on any L1<->L2 transition (hcall entry
> and exit).
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
next prev parent reply other threads:[~2022-02-15 16:02 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-15 3:16 [PATCH 0/9] ppc: nested KVM HV for spapr virtual hypervisor Nicholas Piggin
2022-02-15 3:16 ` [PATCH 1/9] target/ppc: raise HV interrupts for partition table entry problems Nicholas Piggin
2022-02-15 8:29 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 2/9] spapr: prevent hdec timer being set up under virtual hypervisor Nicholas Piggin
2022-02-15 18:34 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 3/9] ppc: allow the hdecr timer to be created/destroyed Nicholas Piggin
2022-02-15 18:36 ` Cédric Le Goater
2022-02-16 0:36 ` Nicholas Piggin
2022-02-15 3:16 ` [PATCH 4/9] target/ppc: add vhyp addressing mode helper for radix MMU Nicholas Piggin
2022-02-15 10:01 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 5/9] target/ppc: make vhyp get_pate method take lpid and return success Nicholas Piggin
2022-02-15 10:03 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 6/9] target/ppc: add helper for books vhyp hypercall handler Nicholas Piggin
2022-02-15 10:04 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 7/9] target/ppc: Add powerpc_reset_excp_state helper Nicholas Piggin
2022-02-15 10:04 ` Cédric Le Goater
2022-02-15 3:16 ` [PATCH 8/9] target/ppc: Introduce a vhyp framework for nested HV support Nicholas Piggin
2022-02-15 15:59 ` Fabiano Rosas
2022-02-15 17:28 ` Cédric Le Goater
2022-02-15 19:19 ` BALATON Zoltan
2022-02-16 0:49 ` Nicholas Piggin
2022-02-15 3:16 ` [PATCH 9/9] spapr: implement nested-hv capability for the virtual hypervisor Nicholas Piggin
2022-02-15 16:01 ` Fabiano Rosas [this message]
2022-02-15 18:21 ` Cédric Le Goater
2022-02-16 1:16 ` Nicholas Piggin
2022-02-16 10:23 ` Cédric Le Goater
2022-02-15 18:33 ` [PATCH 0/9] ppc: nested KVM HV for spapr " Cédric Le Goater
2022-02-15 18:45 ` Daniel Henrique Barboza
2022-02-15 19:20 ` Fabiano Rosas
2022-02-16 9:09 ` Nicholas Piggin
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