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Re: [Xen-devel] [PATCH v2 09/16] x86: don't setup PV hypercall stubs and entries when !CONFIG_PV
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 19 Oct 2018 16:59:08 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Fri, 19 Oct 2018 15:59:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 19/10/18 15:28, Wei Liu wrote:
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
> v2: new
> ---
> xen/arch/x86/x86_64/traps.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c
> index 27154f2..2b7ec7d 100644
> --- a/xen/arch/x86/x86_64/traps.c
> +++ b/xen/arch/x86/x86_64/traps.c
> @@ -267,6 +267,7 @@ void do_double_fault(struct cpu_user_regs *regs)
> panic("DOUBLE FAULT -- system shutdown\n");
> }
>
> +#ifdef CONFIG_PV
> static unsigned int write_stub_trampoline(
> unsigned char *stub, unsigned long stub_va,
> unsigned long stack_bottom, unsigned long target_va)
> @@ -296,6 +297,7 @@ static unsigned int write_stub_trampoline(
> /* Round up to a multiple of 16 bytes. */
> return 32;
> }
> +#endif
>
> DEFINE_PER_CPU(struct stubs, stubs);
> void lstar_enter(void);
> @@ -303,14 +305,17 @@ void cstar_enter(void);
>
> void subarch_percpu_traps_init(void)
> {
> +#ifdef CONFIG_PV
> unsigned long stack_bottom = get_stack_bottom();
> unsigned long stub_va = this_cpu(stubs.addr);
> unsigned char *stub_page;
> unsigned int offset;
> +#endif
>
> /* IST_MAX IST pages + at least 1 guard page + primary stack. */
> BUILD_BUG_ON((IST_MAX + 1) * PAGE_SIZE + PRIMARY_STACK_SIZE >
> STACK_SIZE);
>
> +#ifdef CONFIG_PV
> stub_page = map_domain_page(_mfn(this_cpu(stubs.mfn)));
>
> /*
> @@ -347,6 +352,7 @@ void subarch_percpu_traps_init(void)
> /* Common SYSCALL parameters. */
> wrmsrl(MSR_STAR, XEN_MSR_STAR);
> wrmsrl(MSR_SYSCALL_MASK, XEN_SYSCALL_MASK);
> +#endif
It would be a wise precaution to initialise these MSRs to 0 in the !PV
case, so we don't retain stale values.
~Andrew
> }
>
> void hypercall_page_initialise(struct domain *d, void *hypercall_page)
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