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Re: [Qemu-devel] [PATCH 05/17] ppc: Fix hreg_store_msr() so that non-HV
From: |
Thomas Huth |
Subject: |
Re: [Qemu-devel] [PATCH 05/17] ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV |
Date: |
Mon, 14 Mar 2016 20:29:10 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
On 14.03.2016 17:56, Cédric Le Goater wrote:
> From: Benjamin Herrenschmidt <address@hidden>
>
> This helper is only used by the various instructions that can alter
> MSR and not interrupts. Add a comment to that effect to the interrupt
> code as well in case somebody wants to change this
>
> Signed-off-by: Benjamin Herrenschmidt <address@hidden>
> Reviewed-by: David Gibson <address@hidden>
> ---
> target-ppc/excp_helper.c | 8 ++++++--
> target-ppc/helper_regs.h | 4 ++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
> index c890853d861b..37d4721db63b 100644
> --- a/target-ppc/excp_helper.c
> +++ b/target-ppc/excp_helper.c
> @@ -666,8 +666,12 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int
> excp_model, int excp)
> }
> }
> #endif
> - /* XXX: we don't use hreg_store_msr here as already have treated
> - * any special case that could occur. Just store MSR and update
> hflags
> + /* We don't use hreg_store_msr here as already have treated
> + * any special case that could occur. Just store MSR and update hflags
> + *
> + * Note: We *MUST* not use hreg_store_msr() as-is anyway because it
> + * will prevent setting of the HV bit which some exceptions might need
> + * to do.
> */
> env->msr = new_msr & env->msr_mask;
> hreg_compute_hflags(env);
> diff --git a/target-ppc/helper_regs.h b/target-ppc/helper_regs.h
> index 271fddf17f0a..844240d1a755 100644
> --- a/target-ppc/helper_regs.h
> +++ b/target-ppc/helper_regs.h
> @@ -75,8 +75,8 @@ static inline int hreg_store_msr(CPUPPCState *env,
> target_ulong value,
> excp = 0;
> value &= env->msr_mask;
> #if !defined(CONFIG_USER_ONLY)
> - if (!alter_hv) {
> - /* mtmsr cannot alter the hypervisor state */
> + /* Neither mtmsr nor guest state can alter HV */
> + if (!alter_hv || !(env->msr & MSR_HVB)) {
> value &= ~MSR_HVB;
> value |= env->msr & MSR_HVB;
> }
Reviewed-by: Thomas Huth <address@hidden>
- Re: [Qemu-devel] [PATCH 02/17] ppc: Add macros to register hypervisor mode SPRs, (continued)
[Qemu-devel] [PATCH 05/17] ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV, Cédric Le Goater, 2016/03/14
- Re: [Qemu-devel] [PATCH 05/17] ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV,
Thomas Huth <=
[Qemu-devel] [PATCH 16/17] ppc: Add dummy CIABR SPR, Cédric Le Goater, 2016/03/14
[Qemu-devel] [PATCH 08/17] ppc: Add placeholder SPRs for DPDES and DHDES on P8, Cédric Le Goater, 2016/03/14
[Qemu-devel] [PATCH 09/17] ppc: SPURR & PURR are HV writeable and privileged, Cédric Le Goater, 2016/03/14