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From: Roman Bolshakov <roman@roolebo.dev>
To: Phil Dennis-Jordan <phil@philjordan.eu>
Cc: qemu-devel@nongnu.org, dirty@apple.com, rbolshakov@ddn.com,
	lists@philjordan.eu
Subject: Re: [PATCH 1/3] i386: hvf: Adds support for INVTSC cpuid bit
Date: Sun, 8 Oct 2023 21:07:39 +0300	[thread overview]
Message-ID: <ZSLv6w9JWs7pKEAu@roolebo.dev> (raw)
In-Reply-To: <20230922140914.13906-2-phil@philjordan.eu>

On Fri, Sep 22, 2023 at 04:09:12PM +0200, Phil Dennis-Jordan wrote:
> This patch adds the INVTSC bit to the Hypervisor.framework accelerator's
> CPUID bit passthrough allow-list. Previously, specifying +invtsc in the CPU
> configuration would fail with the following warning despite the host CPU
> advertising the feature:
> 
> qemu-system-x86_64: warning: host doesn't support requested feature:
> CPUID.80000007H:EDX.invtsc [bit 8]
> 
> x86 macOS itself relies on a fixed rate TSC for its own Mach absolute time
> timestamp mechanism, so there's no reason we can't enable this bit for guests.
> 

Reviewed-by: Roman Bolshakov <roman@roolebo.dev>
Tested-by: Roman Bolshakov <roman@roolebo.dev>

Regards,
Roman


  reply	other threads:[~2023-10-08 18:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-22 14:09 [PATCH 0/3] hvf x86 correctness and efficiency improvements Phil Dennis-Jordan
2023-09-22 14:09 ` [PATCH 1/3] i386: hvf: Adds support for INVTSC cpuid bit Phil Dennis-Jordan
2023-10-08 18:07   ` Roman Bolshakov [this message]
2023-09-22 14:09 ` [PATCH 2/3] i386: hvf: In kick_vcpu use hv_vcpu_interrupt to force exit Phil Dennis-Jordan
2023-10-08 18:23   ` Roman Bolshakov
2023-10-08 18:39     ` Phil Dennis-Jordan
2023-10-08 19:19       ` Roman Bolshakov
2023-10-08 19:29         ` Phil Dennis-Jordan
2023-10-16 14:19           ` Phil Dennis-Jordan
2023-10-20 15:12             ` Phil Dennis-Jordan
2023-11-05 15:21               ` Roman Bolshakov
2023-11-06 14:15                 ` Phil Dennis-Jordan
2023-09-22 14:09 ` [PATCH 3/3] i386: hvf: Updates API usage to use modern vCPU run function Phil Dennis-Jordan
2023-10-05 20:30 ` [PATCH 0/3] hvf x86 correctness and efficiency improvements Phil Dennis-Jordan
2023-10-16 14:39 ` Paolo Bonzini
2023-10-16 16:45   ` Phil Dennis-Jordan
2023-10-16 16:48     ` Paolo Bonzini
2023-10-16 20:05       ` Phil Dennis-Jordan
2023-10-16 21:08         ` Paolo Bonzini

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